ICE3AR4780JGXUMA1 - INFINEON TECHNOLOGIES AG

Data Sheet Please read the Important Notice and Warnings at the end of this document Revision 1.1

www.infineon.com 2017-06-13

ICE3AR4780JG

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

Product Highlights

 800 V avalanche rugged CoolMOS™ with startup cell

 Active Burst Mode to reach the lowest Standby Power <100 mW

 Selectable entry and exit burst mode level

 Adjustable blanking Window for high load jumps

 Frequency jitter and soft driving for low EMI

 Adjustable brownout feature

 Auto Restart protection for over load, over temperature, over voltage and external

protection enable function

 Pb-free lead plating; RoHS compliant

PG-DSO-12

Features

 800 V avalanche rugged CoolMOS™ with Startup Cell

 Active Burst Mode for lowest Standby Power

 Selectable entry and exit burst mode level

 100 kHz internally fixed switching frequency with jittering

feature

 Auto Restart Protection for Over load, Open Loop, VCC Under

voltage & Over voltage and Over temperature

 External auto-restart enable pin

 Over temperature protection with 50°C hysteresis

 Built-in 10 ms Soft Start

 Built-in 20 ms and extendable blanking time for short duration

peak power

 Propagation delay compensation for both maximum load and

burst mode

 Adjustable brownout feature

 Overall tolerance of Current Limiting < ±5%

 BiCMOS technology for low power consumption and wide VCC

voltage range

 Soft gate drive with 50 Ω turn on resistor

Applications

 Adapter/Charger, Blue Ray/DVD player, Set-top Box, Digital

Photo Frame

 Auxiliary power supply of Server, PC, Printer, TV, Home

theater/Audio System, White Goods, etc

Description

The ICE3AR4780JG (CoolSET™-F3R80) is an enhanced 800 V

MOSFET version of ICE3BRxx65J (CoolSET™-F3R 650V) in DSO-12

package. In particular it is running at 100 kHz, implemented with

brownout feature, installing 800 V CoolMOS™ with startup cell. It

targets for the low power SMPS with increased MOSFET voltage

margin requirement such as Off-Line battery adapters, DVD R/W,

DVD Combi, Blue ray, set top box, auxiliary power supply for White

Goods, PC and server, etc. In summary, the CoolSET™ F3R80

provides good voltage margin of MOSFET, lowest standby power,

selectable burst level, reduced output ripple during burst mode,

reliable output with brownout feature, accurate maximum power

control for both maximum power and burst power, low EMI with

frequency jittering and soft gate drive, built-in and flexible

protections, etc. Therefore, CoolSET™ F3R80 is a complete

solution for the low power SMPS application.

CVCC

CBulk

Converter

DC Output

Snubber

Power Management

PWM Controller

Current Mode

85 ... 270 VAC

Typical Application

RSense

FBB

Control Unit

VCC

Startup Cell

Precise Low Tolerance Peak

Current Limitation

Drain

CoolSET®-F3R80

(Brownout & Jitter)

CoolMOS®

GND

RBO2

RBO1 Active Burst Mode

Auto Restart Mode

Brownout mode

BBA

Figure 1 Typical application

Type

Package

Marking

VDS

FOSC

RDSon1

230VAC ±15%2

85-265 VAC2

ICE3AR4780JG

PG-DSO-12

3AR4780JG

800 V

100 kHz

4.70 Ω

29 W

19 W

typ at T=25°C

Calculated maximum input power rating at Ta=50°C, Tj=125°C and without copper area as heat sink.

Data Sheet 2 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

Table of Contents

1 Pin Configuration and Functionality ................................................................................ 3

2 Representative Block Diagram ........................................................................................ 4

3 Functional Description ................................................................................................... 5

3.1 Introduction ............................................................................................................................................. 5

3.2 Power Management ................................................................................................................................ 6

3.3 Improved Current Mode .......................................................................................................................... 7

3.3.1 PWM-OP .............................................................................................................................................. 8

3.3.2 PWM-Comparator ............................................................................................................................... 9

3.4 Startup Phase .......................................................................................................................................... 9

3.5 PWM Section .......................................................................................................................................... 11

3.5.1 Oscillator .......................................................................................................................................... 11

3.5.2 PWM-Latch FF1 ................................................................................................................................. 12

3.5.3 Gate Driver ........................................................................................................................................ 12

3.6 Current Limiting .................................................................................................................................... 13

3.6.1 Leading Edge Blanking..................................................................................................................... 13

3.6.2 Propagation Delay Compensation (patented) ................................................................................ 14

3.7 Control Unit ........................................................................................................................................... 15

3.7.1 Basic and Extendable Blanking Mode ............................................................................................. 15

3.7.2 Active Burst Mode (patented) .......................................................................................................... 16

3.7.2.1 Selectable burst entry level ........................................................................................................ 17

3.7.2.2 Entering Active Burst Mode ........................................................................................................ 18

3.7.2.3 Working in Active Burst Mode ..................................................................................................... 18

3.7.2.4 Leaving Active Burst Mode .......................................................................................................... 18

3.7.3 Protection Modes ............................................................................................................................. 19

3.7.3.1 VCC OVP, OTP and VCC under voltage ........................................................................................ 21

3.7.3.2 Over load, open loop protection ................................................................................................ 22

3.7.4 Brown out Mode ............................................................................................................................... 23

3.7.5 Action sequence at BBA pin ............................................................................................................. 25

4 Electrical Characteristics ............................................................................................... 27

4.1 Absolute Maximum Ratings .................................................................................................................. 27

4.2 Absolute Maximum Ratings .................................................................................................................. 28

4.3 Characteristics ....................................................................................................................................... 28

4.3.1 Supply Section ................................................................................................................................. 28

4.3.2 Internal Voltage Reference .............................................................................................................. 29

4.3.3 PWM Section ..................................................................................................................................... 29

4.3.4 Soft Start time .................................................................................................................................. 29

4.3.5 Control Unit ...................................................................................................................................... 30

4.3.6 Current Limiting ............................................................................................................................... 31

4.3.7 CoolMOS™ Section ........................................................................................................................... 31

5 CoolMOS™ Performance Characteristics .......................................................................... 32

6 Input Power Curve ........................................................................................................ 34

7 Outline Dimension ........................................................................................................ 35

8 Marking ....................................................................................................................... 36

9 Schematic for recommended PCB layout ......................................................................... 37

Revision History ........................................................................................................... 38

Data Sheet 3 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

1 Pin Configuration and Functionality

Table 1 Pin definitions and functions

Symbol

Function

BBA

BBA (Brownout, extended blanking Blanking time & Auto-restart enable)

The BBA pin combines the functions of brownout, extendable blanking time for over

load protection and the external auto-restart enable. The brownout feature is to stop

the switching pulse when the input voltage is dropped to a preset low level. The

extendable blanking time function is to extend the built-in 20 ms blanking time for over

load protection by adding an external capacitor to ground. The external auto-restart

enable function is an external access to stop the gate switching and force the IC to enter

auto-restart mode. It is triggered by pulling the pin voltage to less than 0.4 V.

FBB

FBB (Feedback & Burst entry control)

The FBB pin combines the feedback function and the burst entry/exit control. The

regulation information is provided by the FBB pin to the internal Protection Unit and the

internal PWM-Comparator to control the duty cycle. The FBB-signal is the only control

signal in case of light load at the Active Burst Mode. The burst entry/ exit control provides

an access to select the entry/exit burst mode level.

3, 9, 10

n.c.

not connected

CS (Current Sense)

The Current Sense pin senses the voltage developed on the shunt resistor inserted in the

source of the integrated CoolMOS™. If CS reaches the internal threshold of the Current

Limit Comparator, the Driver output is immediately switched off. Furthermore the current

information is provided for the PWM comparator to realize the Current Mode.

5, 6, 7, 8

Drain

Drain (Drain of integrated CoolMOS™)

Pin Drain is the connection to the Drain of the integrated CoolMOS™.

VCC

VCC (Power Supply)

The VCC pin is the positive supply of the IC. The operating range is between 10.5 V and

25 V.

GND

GND (Ground)

The GND pin is the ground of the controller.

VCC

BBA

FBB

N.C

GND

N.C.

Drain

N.C

Figure 2 Pin configuration PG-DSO-12(top view)

Data Sheet 4 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

2 Representative Block Diagram

Internal Bias Voltage

Reference

Oscillator

Duty Cycle

max

x3.25

Current Limiting

PWM OP

Current Mode

Soft Start

RFB

Power Management

CBK

CVCC

85 ... 270 VAC CBulk

Converter

DC Output

VOUT

PWM

Comparator

0.9V

4.5V

Gate

Driver

0.75

Clock

RSense

10k

C6a

3.2V

C5VFB_burst C10

GND

FBB

PWM Section

Control Unit

FF1

C12

LEB

220ns

25k

2pF

5.0V

1pF

Propagation-Delay

Compensation

5.0V

Undervoltage Lockout

Vcsth

ICE3ARxx80JZ / CoolSET®-F3R80 ( Brownout & Jitter Mode )

Snubber

VCC Drain

CoolMOS®

Startup Cell

C6b

3.5V &

G11

0.62V

10.5V

17V

# : optional external components;

#1 : CBK is used to extend the Blanking Time

#2 : RBO1 & RBO2 are used for brownout feature; RBO1 tie to Vcc if no brownout feature

#3 : TAE is used to enable the external Auto-restart feature

Freq. jitter

20ms

Blanking

Time

400ns Blanking Time

Soft-Start

Comparator

Auto-restart

Enable

Signal

TAE

CFB

400ns Blanking Time

BBA

Propagation-Delay

Compensation-Burst

Vcsth_burst

Burst

detect and

adjust

VFB_burst

Vcs_burst

RBO1

RBO2

Power-Down

Reset

Counter

C11

Spike

Blanking

30us

4.5V

C13

4.0V

20ms Blanking Time

Active Burst

Mode

Auto

Restart

Mode

Ichg_BO

0.9V

Brownout

mode

Ichg_EB

5.0V

20.5V

VCC

Thermal

Shutdown

Tj >130°C

Soft Start

Block

0.4V

LEB

180ns

G10

G13

500CT1

Figure 3 Representative Block Diagram

Data Sheet 5 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

3 Functional Description

All values which are used in the functional description are typical values. For calculating the worst cases the

min/max values which can be found in section 4 Electrical Characteristics have to be considered.

3.1 Introduction

CoolSET™-F3R80 brownout and jitter 800 V version (ICE3AR4780JG) is the enhanced version of the CoolSET™-

F3R 650V version (ICE3BRxx65J). It is particular good for high voltage margin low power SMPS application such

as auxiliary power supply for PC and server. The major characteristics are that the IC is developed with 800 V

CoolMOS™ with start up cell, having adjustable brownout feature, running at 100 kHz switching frequency and

packed in DIP-16/12 package. It is derived from F3R 650 V version. Thus most of the good features are retained.

Besides, it includes some enhanced features and new features.

The retained good features include BiCMOS technology to reduce power consumption and increase the Vcc

voltage range, cycle by cycle current mode control, built-in 10ms soft start to reduce the stress of switching

elements during start up, built-in 20 ms and extended blanking time for short period of peak power before

entering protection, active burst mode for lowest standby power and propagation delay compensation for

close power limit between high line and low line, frequency jittering for low EMI performance, the built-in auto-

restart mode protections for open loop, over load, Vcc OVP, Vcc under voltage, etc. and also the most flexible

external auto-restart enable, etc.

The enhanced features include narrowing the feedback voltage swing from 0.5V to 0.3V during burst mode so

that the output voltage ripple can be reduced by 40%, reduction of the fast voltage fall time of the MOSFET by

increasing the soft turn-on time and addition of 50 Ω turn-on resistor, faster start up time by optimizing the VCC

capacitor to 10 µF and over temperature protection with 50°C hysteresis.

The new features include adjustable brownout for reliable output performance, selectable entry and exit burst

mode so that smaller entry/exit power to burst mode or even no burst mode is possible and the propagation

delay compensation for burst mode so that the entry/exit burst mode power is close between high line and low

line.

In summary, the CoolSET™ F3R80 provides good voltage margin of MOSFET, lowest standby power, flexible

burst level, reduced output ripple during burst mode, reliable output with brownout feature, accurate power

limit for both maximum power and burst power, low EMI with frequency jittering and soft gate drive, built-in

and flexible protections, etc. Therefore, CoolSET™ F3R80 is a complete solution for the low power SMPS

application.

Data Sheet 6 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

3.2 Power Management

Internal Bias

Voltage

Reference

Power Management

5.0V

Undervoltage Lockout

17V

10.5V

Power-Down Reset

Active Burst Mode

Auto Restart

Mode

Startup Cell

VCCDrain

CoolMOS®

Soft Start block

Figure 4 Power Management

The Undervoltage Lockout monitors the external supply voltage VVCC. When the SMPS is plugged to the main

line the internal Startup Cell is biased and starts to charge the external capacitor CVCC which is connected to the

VCC pin. This VCC charge current is controlled to 0.9 mA by the Startup Cell. When the VVCC exceeds the on-

threshold VVCCon = 17 V the bias circuit are switched on. Then the Startup Cell is switched off by the Undervoltage

Lockout and therefore no power losses present due to the connection of the Startup Cell to the Drain voltage.

To avoid uncontrolled ringing at switch-on, a hysteresis start up voltage is implemented. The switch-off of the

controller can only take place when VVCC falls below 10.5 V after normal operation was entered. The maximum

current consumption before the controller is activated is about 200 µA.

When VVCC falls below the off-threshold VVCCoff = 10.5 V, the bias circuit is switched off and the soft start counter is

reset. Thus it ensures that at every startup cycle the soft start starts at zero.

The internal bias circuit is switched off if Auto Restart Mode is entered. The current consumption is then

reduced to 320 µA.

Once the malfunction condition is removed, this block will then turn back on. The recovery from Auto Restart

Mode does not require re-cycling the AC line.

When Active Burst Mode is entered, the internal Bias is switched off most of the time but the Voltage Reference

is kept alive in order to reduce the current consumption below 620 µA.

Data Sheet 7 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

3.3 Improved Current Mode

x3.25

PWM OP

Improved

Current Mode

0.6V

PWM-Latch

FBB

Driver

Soft-Start Comparator

Figure 5 Current Mode

Current Mode means the duty cycle is controlled by the slope of the primary current. This is done by comparing

the FBB signal with the amplified current sense signal.

FBB

Amplified Current Signal

ton

0.6V

Driver

Figure 6 Pulse Width Modulation

In case the amplified current sense signal exceeds the FBB signal the on-time ton of the driver is finished by

resetting the PWM-Latch (Figure 6).

The primary current is sensed by the external series resistor RSense inserted in the source of the integrated

CoolMOS™. By means of Current Mode regulation, the secondary output voltage is insensitive to the line

variations. The current waveform slope will change with the line variation, which controls the duty cycle.

The external RSense allows an individual adjustment of the maximum source current of the integrated

CoolMOS™.

To improve the Current Mode during light load conditions the amplified current ramp of the PWM-OP is

superimposed on a voltage ramp, which is built by the switch T2, the voltage source V1 and a resistor R1 (Figure

6). Every time the oscillator shuts down for maximum duty cycle limitation the switch T2 is closed by VOSC. When

the oscillator triggers the Gate Driver, T2 is opened so that the voltage ramp can start.

Data Sheet 8 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

PWM OP

0.6V

10k

Oscillator

T2R1

FBB

PWM-Latch

Gate Driver

Voltage Ramp

VOSC

Soft-Start Comparator

time delay

circuit (156ns)

X3.25

PWM Comparator

Figure 7 Improved Current Mode

In case of light load the amplified current ramp is too small to ensure a stable regulation. In that case the

Voltage Ramp is a well defined signal for the comparison with the FBB-signal. The duty cycle is then controlled

by the slope of the Voltage Ramp.

By means of the time delay circuit which is triggered by the inverted VOSC signal, the Gate Driver is switched-off

until it reaches approximately 156 ns delay time (Figure 8). It allows the duty cycle to be reduced continuously

till 0% by decreasing VFBB below that threshold.

VOSC

0.6V

FBB

max.

Duty Cycle

Gate

Driver

Voltage

Ramp

156ns time delay

Figure 8 Light Load Conditions

3.3.1 PWM-OP

The input of the PWM-OP is applied over the internal leading edge blanking to the external sense resistor

RSense connected to pin CS. RSense converts the source current into a sense voltage. The sense voltage is

amplified with a gain of 3.25 by PWM OP. The output of the PWM-OP is connected to the voltage source V1. The

voltage ramp with the superimposed amplified current signal is fed into the positive inputs of the PWM--

Comparator C8 and the Soft-Start-Comparator (Figure 9).

Data Sheet 9 Revision 1.1

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Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

3.3.2 PWM-Comparator

The PWM-Comparator compares the sensed current signal of the integrated CoolMOS™ with the feedback

signal VFBB (Figure 9). VFBB is created by an external optocoupler or external transistor in combination with the

internal pull-up resistor RFB and provides the load information of the feedback circuitry. When the amplified

current signal of the integrated CoolMOS™ exceeds the signal VFBB the PWM-Comparator switches off the Gate

Driver.

X3.25

PWM OP

Improved

Current Mode

PWM Comparator

Soft-Start Comparator

0.6V

FBB

Optocoupler

RFB

PWM-Latch

Figure 9 PWM Controlling

3.4 Startup Phase

Soft-Start

Comparator

Soft Start

Gate Driver

0.6V

x3.25

PWM OP

Soft Start counter

Soft Start

Soft Start finish

SoftS

Figure 10 Soft Start

In the Startup Phase, the IC provides a Soft Start period to control the primary current by means of a duty cycle

limitation. The Soft Start function is a built-in function and it is controlled by an internal counter.

Figure 11 Soft Start Phase

Data Sheet 10 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

When the VVCC exceeds the on-threshold voltage, the IC starts the Soft Start mode (Figure 11).

The function is realized by an internal Soft Start resistor, a current sink and a counter. And the amplitude of the

current sink is controlled by the counter (Figure 12).

RSoftS

Soft Start

Counter

SoftS

32I

Figure 12 Soft Start Circuit

After the IC is switched on, the VSoftS voltage is controlled such that the voltage is increased step-wisely (32

steps) with the increase of the counts. The Soft Start counter would send a signal to the current sink control in

every 300 µs such that the current sink decrease gradually and the duty ratio of the gate drive increases

gradually. The Soft Start will be finished in 10 ms (tSoft-Start) after the IC is switched on. At the end of the Soft Start

period, the current sink is switched off.

Within the soft start period, the duty cycle is increasing from zero to maximum gradually (Figure 12).

VSOFTS32

VSoftS

Gate

Driver

tSoft-Start

Figure 13 Gate drive signal under Soft-Start Phase

In addition to Start-Up, Soft-Start is also activated at each restart attempt during Auto Restart.

Data Sheet 11 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

VSoftS

VSOFTS32

4.5V

tSoft-Start

VOUT

VFB

VOUT

tStart-Up

Figure 14 Start Up Phase

The Start-Up time tStart-Up before the converter output voltage VOUT is settled must be shorter than the Soft-

Start Phase tSoft-Start (Figure 14). By means of Soft-Start there is an effective minimization of current and voltage

stresses on the integrated CoolMOS™, the clamp circuit and the output rectifier and it helps to prevent

saturation of the transformer during Start-Up.

3.5 PWM Section

Oscillator

Duty Cycle

max

Gate Driver

0.75

Clock

PWM Section

FF1

Soft Start

Comparator

PWM

Comparator

Current

Limiting

CoolMOS®

Gate

Frequency

Jitter

Soft Start

Block

Figure 15 PWM Section Block

3.5.1 Oscillator

The oscillator generates a fixed frequency of 100 kHz with frequency jittering of ±4% (which is ±4 kHz) at a

jittering period of 4 ms.

A capacitor, a current source and current sink which determine the frequency are integrated. The charging and

discharging current of the implemented oscillator capacitor are internally trimmed in order to achieve a very

Data Sheet 12 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

accurate switching frequency. The ratio of controlled charge to discharge current is adjusted to reach a

maximum duty cycle limitation of Dmax = 0.75.

Once the Soft Start period is over and when the IC goes into normal operating mode, the switching frequency of

the clock is varied by the control signal from the Soft Start block. Then the switching frequency is varied in

range of 100 kHz ± 4 kHz at period of 4 ms.

3.5.2 PWM-Latch FF1

The output of the oscillator block provides continuous pulse to the PWM-Latch which turns on/off the

integrated CoolMOS™. After the PWM-Latch is set, it is reset by the PWM comparator, the Soft Start comparator

or the Current -Limit comparator. When it is in reset mode, the output of the driver is shut down immediately.

3.5.3 Gate Driver

VCC

PWM-Latch

CoolMOS®

Gate Driver

Gate

50

Figure 16 Gate Driver

The driver-stage is optimized to minimize EMI and to provide high circuit efficiency. This is done by reducing

the switch on slope when exceeding the integrated CoolMOS™ threshold. This is achieved by a slope control of

the rising edge at the driver’s output (Figure 17) and adding a 50 Ω gate turn on resistor (Figure 16). Thus the

leading switch on spike is minimized.

(internal)

VGate

4.6V

typ. t = 160ns

Figure 17 Gate Rising Slope

Furthermore the driver circuit is designed to eliminate cross conduction of the output stage.

During power up, when VCC is below the undervoltage lockout threshold VVCCoff, the output of the Gate Driver is

set to low in order to disable power transfer to the secondary side.

Data Sheet 13 Revision 1.1

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Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

3.6 Current Limiting

Current Limiting

C10

C12

G10

Propagation-Delay

Compensation

Vcsth

PWM Latch

FF1

10k

D1 1pF

PWM-OP

Propagation-Delay

Compensation-Burst

VCSth_burst

LEB

220ns

LEB

180ns

VFB_burst

FBB

G13

Active Burst

Mode

Figure 18 Current Limiting Block

There is a cycle by cycle peak current limiting operation realized by the Current-Limit comparator C10. The

source current of the integrated CoolMOS™ is sensed via an external sense resistor RSense. By means of RSense

the source current is transformed to a sense voltage VSense which is fed into the pin CS. If the voltage VSense

exceeds the internal threshold voltage Vcsth, the comparator C10 immediately turns off the gate drive by

resetting the PWM Latch FF1.

A Propagation Delay Compensation is added to support the immediate shut down of the integrated CoolMOS™

with very short propagation delay. Thus the influence of the AC input voltage on the maximum output power

can be reduced to minimal. This compensation applies to both the peak load and burst mode.

In order to prevent the current limit from distortions caused by leading edge spikes, a Leading Edge Blanking

(LEB) is integrated in the current sense path for the comparators C10, C12 and the PWM-OP.

The output of comparator C12 is activated by the Gate G10 if Active Burst Mode is entered. When it is activated,

the current limiting is reduced to Vcsth_burst. This voltage level determines the maximum power level in Active

Burst Mode.

3.6.1 Leading Edge Blanking

VSense

Vcsth tLEB = 220ns/180ns

Figure 19 Leading Edge Blanking

Whenever the integrated CoolMOS™ is switched on, a leading edge spike is generated due to the primary-side

capacitances and reverse recovery time of the secondary-side rectifier. This spike can cause the gate drive to

Data Sheet 14 Revision 1.1

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Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

switch off unintentionally. In order to avoid a premature termination of the switching pulse, this spike is

blanked out with a time constant of tLEB = 220 ns for normal load and tLEB = 180 ns for burst mode.

3.6.2 Propagation Delay Compensation (patented)

In case of overcurrent detection, there is always propagation delay to switch off the integrated CoolMOS™. An

overshoot of the peak current Ipeak is induced to the delay, which depends on the ratio of dI/ dt of the peak

current (Figure 20).

ISense

ILimit

tPropagation Delay

IOvershoot1

Ipeak1

Signal1Signal2

IOvershoot2

Ipeak2

Figure 20 Current Limiting

The overshoot of Signal 2 is larger than of Signal 1 due to the steeper rising waveform. This change in the slope

is depending on the AC input voltage. Propagation Delay Compensation is integrated to reduce the overshoot

due to dI/dt of the rising primary current. Thus the propagation delay time between exceeding the current

sense threshold Vcsth and the switching off of the integrated CoolMOS™ is compensated over temperature

within a wide input range. Current Limiting is then very accurate.

For example, Ipeak = 0.5 A with RSense = 2. The current sense threshold is set to a static voltage level Vcsth=1 V

without Propagation Delay Compensation. A current ramp of dI/dt = 0.4 A/µs, or dVSense/dt = 0.8 V/µs, and a

propagation delay time of tPropagation Delay =180 ns leads to an Ipeak overshoot of 14.4%. With the propagation

delay compensation, the overshoot is only around 2% (Figure 21).

0,9

0,95

1,05

1,1

1,15

1,2

1,25

1,3

0 0,2 0,4 0,6 0,8 1 1,2 1,4 1,6 1,8 2

with compensation without compensation

dVSense



Sense

Figure 21 Overcurrent Shutdown

The Propagation Delay Compensation is realized by means of a dynamic threshold voltage Vcsth (Figure 21). In

case of a steeper slope the switch off of the driver is earlier to compensate the delay.

Data Sheet 15 Revision 1.1

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Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

Vcsth

VOSC

Signal1 Signal2

VSense Propagation Delay

max. Duty Cycle

off time

Figure 22 Dynamic Voltage Threshold Vcsth

Similarly, the same concept of propagation delay compensation is also implemented in burst mode with

reduced level, Vcsth_burst (Figure 18). With this implementation, the entry and exit burst mode power can be very

close between low line and high line input voltage.

3.7 Control Unit

The Control Unit contains the functions for Active Burst Mode and Auto Restart Mode. The Active Burst Mode

and the Auto Restart Mode both have 20 ms internal blanking time. For the over load Auto Restart Mode, the 20

ms blanking time can be further extended by adding an external capacitor at BV pin. With the blanking time, the

IC avoids entering into those two modes accidentally. That buffer time is very useful for the application which

works in short duration of peak power occasionally.

3.7.1 Basic and Extendable Blanking Mode

C11

4.5V

0.9V

4.5V

Control Unit

Auto

Restart

Mode

5.0V

FBB

CBK

Spike

Blanking

30us

Ichg_EB

Counter &

20ms

Blanking

Time

ROV2

500CT1

Figure 23 Basic and Extendable Blanking Mode

There are 2 kinds of Blanking mode; basic mode and the extendable mode. The basic mode is a built-in 20 ms

blanking time while the extendable mode can extend this blanking time by connecting an external capacitor to

the BBA pin. For the extendable mode, the gate G5 remains blocked even though the 20 ms blanking time is

reached. After reaching the 20 ms blanking time the counter is activated and the switch S1 is turned on to

charge the voltage of BBA pin by the constant current source, Ichg_EB. When the voltage of BBA pin hits 4.5 V,

which is sensed by comparator C11, the counter will increase the counter by 1. Then it switches off the switch

Data Sheet 16 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

S1 and turns on the switch S2. The voltage at BBA pin will be discharged through a 500 Ω resistor. When the

voltage drops to 0.9 V which is sensed by comparator C3, the switch S2 will be turned off and the switch S1 will

be turned on. Then the constant current Ichg_EB will charge the CBK capacitor again. When the voltage at BBA hits

4.5 V which is sensed by comparator C11, the counter will increase the count to 2. The process repeats until it

reaches total count of 256 (Figure 24). Then the counter will release a high output signal. When the AND gate G5

detects both high signals at the inputs, it will activate the 30ms spike blanking circuit and finally the auto-

restart mode will be activated.

Figure 24 Waveform at extended blanking time

For example, if CBK=0.1 µF, Ichg_EB=720 mA

Extended blanking time = 256*(CBK*(4.5 V-0.9 V)/Ichg_EB + CBK*500*ln(4.5/0.9)) = 148.6 ms

Total blanking time = 20 ms+ 148.6 ms =168.6 ms

If there is a resistor RBO2 connected to BBA pin, the effective charging current will be reduced. The blanking time

will be increased.

For example, if CBK=0.1 µF, Ichg_EB=720 mA, RBO2=12.8 kΩ,

Ichg_EB’=Ichg_EB-(4.5 V+0.9 V)/(2*RBO2)=509 mA

Extended blanking time = 256*(CBK*(4.5 V-0.9 V)/Ichg_EB’ + CBK*500*ln(4.5/0.9)) = 201.6 ms

Total blanking time = 20 ms+201.6 ms = 221.6 ms

where Ichg_EB’=net charging current to CBK

Note: The above calculation does not include the effect of the brown out circuit where there is extra biasing current

flowing from the input. That means the extended blanking time will be shortened with the line voltage

change if brown out circuit is implemented.

3.7.2 Active Burst Mode (patented)

To increase the efficiency of the system at light load, the most effective way is to operate at burst mode.

Starting from CoolSET™ F3, the IC has been employing the active burst mode and it can achieve the lowest

standby power. ICE3AR4780JG adopts the same concept with some more innovative improvements to the

feature. It includes the adjustable entry burst level, close power control between high line and low line and the

smaller output ripple during burst mode.

Most of the burst mode design in the market will provide a fixed entry burst mode level which is a ratio to the

maximum power of the design. ICE3AR4780JG provides a more flexible level which can be selected externally.

The provision also includes not entering burst mode.

Data Sheet 17 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

Propagation delay is the major contributor for the power control variation for DCM flyback converter. It is

proved to be effective in the maximum power control. ICE3AR4780JG also apply the same concept in the burst

mode. Therefore, the entry and exit burst mode power is also finely controlled during burst mode.

The feedback control swing during burst mode will affect the output ripple voltage directly. ICE3AR4780JG

reduces the swing from 0.5 V to 0.3 V. Therefore, it would have around 40% improvement for the output ripple.

C6a

3.5V

C13

4.0V

Control Unit

Internal

Bias

C6b

3.2V

G11

Active Burst

Mode

C5 20 ms Blanking

Time

CFB

C12

Vcsth_burst

VFB_burst

G10 & FF1

FBB

Current Limiting

Burst detect

and adjust

Figure 25 Active Burst Mode

3.7.2.1 Selectable burst entry level

The burst mode entry level can be selected by changing the different capacitor CFB at FBB pin. There are 4 levels

to be selected with different capacitor which are targeted for 10%, 6.67%, 4.38% and 0% of the maximum input

power. At the same time, the exit burst levels are targeted to 20%, 13.3%, 9.6% and 0% of the maximum power

accordingly. The corresponding capacitance range is from 6.8 nF to 100 pF. The below table is the

recommended capacitance range for the entry and exit level with the CFB capacitor.

Table 2 CFB versus active burst mode entry/exit level

CFB

Entry level

Exit level

% of Pin_max

VFB_burst

% of Pin_max

Vcsth_burst

≥ 6.8 nF (5%, X7R)

10%

1.60 V

20%

0.45 V

1nF~2.2 nF (1%, COG)

6.67%

1.42 V

13.3%

0.37 V

220pF~470 pF (1%, COG)

4.38%

1.27 V

9.6%

0.31 V

≤ 100 pF (1%, COG)

never

always

The selection is at the 1st 1ms of the UVLO “ON” (VVCC > 17 V) during the 1st start up but it does not detect in the

subsequent re-start due to auto-restart protection. In case there is protection triggered such as brown out

before starts up, the detection will be held until the protection is removed. When the Vcc reaches the UVLO

“ON” in the 1st start up, the capacitor CFB at FBB pin is charged by a 5V voltage source through the RFB

resistor. When the voltage at FBB pin hits 4.5 V, the FF4 will be set, the switch S9 is turned “ON” and the counter

will increase by 1. Then the CFB is discharged through a 500 Ω resistor. After reaching 0.5 V, the FF4 is reset and

the switch S9 is turned “OFF”. Then the CFB capacitor is charged by the 5V voltage source again until it reaches

4.5 V. The process repeats until the end of 1 ms. Then the detection is ended. After that, the total number of

count in the counter is compared and the VFB-burst and the Vcs_burst are selected accordingly (Figure 26)

Data Sheet 18 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

C19

CFB

C20

0.5V

4.5V

Control Unit

FBB

500

RFB

counter

Comparator

logic

VCSth_burst

VFB_burst

1ms

timer

UVLO during

1st startup

S Q

UVLO

FF4

Figure 26 Active Burst Mode

3.7.2.2 Entering Active Burst Mode

The FBB signal is kept monitoring by the comparator C5 (Figure 25). During normal operation, the internal

blanking time counter is reset to 0. When FBB signal falls below VFB_burst, it starts to count. When the counter

reaches 20 ms and FBB signal is still below VFB_burst, the system enters the Active Burst Mode. This time window

prevents a sudden entering into the Active Burst Mode due to large load jumps.

After entering Active Burst Mode, a burst flag is set and the internal bias is switched off in order to reduce the

current consumption of the IC to about 620 µA.

It needs the application to enforce the VCC voltage above the Undervoltage Lockout level of 10.5 V such that

the Startup Cell will not be switched on accidentally. Or otherwise the power loss will increase drastically. The

minimum VCC level during Active Burst Mode depends on the load condition and the application. The lowest

VCC level is reached at no load condition.

3.7.2.3 Working in Active Burst Mode

After entering the Active Burst Mode, the FBB voltage rises as VOUT starts to decrease, which is due to the

inactive PWM section. The comparator C6a monitors the FBB signal. If the voltage level is larger than 3.5 V, the

internal circuit will be activated; the Internal Bias circuit resumes and starts to provide switching pulse. In

Active Burst Mode the gate G10 is released and the current limit is reduced to Vcsth_burst (Figure 3 and Figure 25).

In one hand, it can reduce the conduction loss and the other hand, it can reduce the audible noise. If the load at

VOUT is still kept unchanged, the FBB signal will drop to 3.2 V. At this level the C6b deactivates the internal

circuit again by switching off the Internal Bias. The gate G11 is active again as the burst flag is set after entering

Active Burst Mode. In Active Burst Mode, the FBB voltage is changing like a saw tooth between 3.2 V and 3.5 V

(Figure 27).

3.7.2.4 Leaving Active Burst Mode

The FBB voltage will increase immediately if there is a high load jump. This is observed by the comparator C13

(Figure 25). Since the current limit is reduced to 31%~45% of the maximum current during active burst mode, it

needs a certain load jump to raise the FBB signal to exceed 4.0 V. At that time the comparator C5 resets the

Active Burst Mode control which in turn blocks the comparator C12 by the gate G10. The maximum current can

then be resumed to stabilize VOUT.

Data Sheet 19 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

VFB_burst

3.5V

4.0V

VFBB

Vcsth_burst

Vcsth

VCS

10.5V

VVCC t

620uA

IVCC

5.7mA

VOUT

20ms Blanking Time

Current limit level during

Active Burst Mode

3.2V

Entering

Active Burst

Mode

Blanking Timer

Leaving Active

Burst Mode

Figure 27 Signals in Active Burst Mode

3.7.3 Protection Modes

The IC provides Auto Restart mode as the major protection feature. Auto Restart mode can prevent the SMPS

from destructive states. There are four kinds of auto restart mode; auto restart mode, non switch auto restart

mode, odd skip auto restart mode and odd skip non switch auto restart mode.

10.5V

VCS

VVCC

17V

Fault

detected

Startup and detect

Figure 28 Auto restart waveform

Data Sheet 20 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

10.5V

VCS

VVCC

17V

Fault

detected

Startup and detect

No switching

Figure 29 Non switch auto restart waveform

The main purpose of the odd skip auto restart is to extend the restart time such that the power loss during auto

restart protection can be reduced. This feature is particularly good for smaller VCC capacitor where the restart

time is shorter. There is no detecting of fault and no switching pulse for the odd number restart cycle. At the

even number of restart cycle the fault detect and soft start switching pulses maintained. If the fault persists, it

would continue the auto-restart mode. However, if the fault is removed, it can release to normal operation only

at the even number auto restart cycle (Figure 29).

10.5V

VCS

VVCC

17V

Fault

detected No detect Startup and detect

No detect

Figure 30 Odd skip auto restart waveform

Odd skip non switch auto restart mode is similar to odd skip auto restart mode except the start up switching

pulses are also suppressed at the even number of the restart cycle. The detection of fault still remains at the

even number of the restart cycle. When the fault is removed, the IC will resume to normal operation at the even

number of the restart cycle (Figure 30).

10.5V

VCS

VVCC

17V

Fault

detected No detect Startup and detect

No detect

No switching

Figure 31 Odd skip non switch auto restart waveform

Data Sheet 21 Revision 1.1

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Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

The following table list down the protection modes of the CoolSET™.

Table 3 Protection functions

Protection function

Failure condition

Protection Mode

VCC Overvoltage

1. VCC > 20.5 V and FB > 4.5 V &

during soft start period

2. VCC > 25.5 V

Odd skip Auto Restart

Overtemperature

(controller junction)

TJ > 130°C

Odd skip Auto Restart

Overload / Open loop

VFBB > 4.5 V, last for 20 ms and

extended blanking time

(extended blanking time counted

as 256 times of VBBA charging and

discharging from 0.9 V to 4.5V )

Odd skip Auto Restart

Vcc Undervoltage / Short

Optocoupler

VCC < 10.5 V

Auto Restart

Overtemperature

(controller junction)

TJ > 130°C

Odd skip non switch Auto Restart

External protection enable

VAE < 0.4 V

Non switch Auto Restart

Brownout

VBO_ref < 0.9 V and last for 30 ~ 60 µs

Non switch Auto Restart

3.7.3.1 VCC OVP, OTP and VCC under voltage

20.5V

4.5V

Voltage

Reference

Control Unit

Auto Restart

Mode Reset

VVCC < 10.5V

FBB

softs_period

Spike

Blanking

30μs

Thermal Shutdown

Tj >130°C

Auto Restart

mode

VCC

C2 120μs blanking

time

25.5V

Figure 32 Vcc OVP and OTP

There are 2 types of VCC over voltage protection; VCC OVP (1) and VCC OVP (2). The VCC OVP (1) takes action

only during the soft start period. The VCC OVP (2) takes the action in any conditions.

VCC OVP (1) condition is when VVCC voltage is > 20.5 V, VFBB voltage is > 4.5 V and during soft start period, the IC

enters into odd skip Auto Restart Mode. This condition likely happens during start up at open loop fault (Figure

30).

Vcc OVP (2) condition is when VVCC voltage is > 25.5V, the IC enters into odd skip Auto Restart Mode (Figure 30).

The over temperature protection OTP is sensed inside the controller IC. The Thermal Shutdown block keeps on

monitoring the junction temperature of the controller. After detecting a junction temperature higher than

Data Sheet 22 Revision 1.1

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Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

130°C, the IC will enter into the odd skip non switch Auto Restart mode. The ICE3AR4780JG has also

implemented with a 50°C hysteresis. That means the IC can only be recovered when the controller junction

temperature is dropped 50°C lower than the over temperature trigger point (Figure 31).

The VCC undervoltage and short opto-coupler will go into the normal auto restart mode inherently.

In case of VCC undervoltage, the Vcc voltage drops indefinitely. When it drops below the Vcc under voltage lock

out “OFF” voltage (10.5 V), the IC will turn off the IC and the startup cell will turn on again. Then the Vcc voltage

will be charged up to UVLO “ON” voltage (17 V) and the IC turns on again provided the startup cell charge up

current is not drained by the fault. If the fault is not removed, the Vcc will continue to drop until it hits UVLO

“OFF” voltage and the restart cycle repeats.

Short Optocoupler can lead to VCC undervoltage because once the opto-coupler (transistor side) is shorted, the

feedback voltage will drop to zero and there will be no switching pulse. Then the VCC voltage will drop same as

the VCC undervoltage.

3.7.3.2 Over load, open loop protection

C11

4.5V

0.9V

4.5V

Control Unit

5.0V

FBB

CBK Spike

Blanking

30us

Ichg_EB

counter

20ms

Blanking

Time

Voltage

Reference

Auto Restart

Mode Reset

VVCC < 10.5V

Auto

Restart

Mode

ROV2

500CT1

Figure 33 Over load, open loop protection

In case of Overload or Open Loop, the VFBB voltage exceeds 4.5 V which will be observed by comparator C4. Then

the built-in blanking time counter starts to count. When it reaches 20 ms, the extended blanking time counter

CT1 is activated. The switch S2 is turned on and the voltage at the BBA pin will be discharged through 500 Ω

resistor. When it drops to 0.9 V, the switch S2 is turned off and the Switch S1 is turned on. Then a constant

current source Ichg_EB will start to charge up BBA pin. When the voltage hits 4.5 V which is monitored by

comparator C11, the switch S1 is turned off and the count will increase by 1. Then the switch S2 will turn on

again and the voltage will drop to 0.9 V and rise to 4.5 V again. The count will then increase by 1 again. When the

total count reaches 256, the counter CT1 will stop and it will release a high output signal. When both the input

signals at AND gate G5 is high, the odd skip Auto Restart Mode is activated after the 30 µs spike blanking time

(Figure 30).

The total blanking time depends on the addition of the built-in and the extended blanking time. If there is no

CBK capacitor at BBA pin, the count will finish within 0.1 ms and the equivalent blanking time is just the built-in

time of 20 ms. However, if the CBK capacitor is big enough, it can be as long as 1 s. If CBK is 0.1 µF and Ichg_EB is 720

µA, the extendable blanking time is around 148.6 ms and the total blanking time is 168.6 ms.

Data Sheet 23 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

Since the BBA pin is a multi-function pin, it would share with different functions. The resistor RBO2 from

brownout feature application may however affect the extendable blanking time (Figure 33). Thus it should take

the RBO2 into the calculation of the extendable blanking time. For example the extended blanking time would be

changed (159.6~191.2 ms) with different resistance values of RBO2 resistor. Table 4 shows some examples of CBK,

RBO2 vs blanking time.

Table 4 Blanking time vs CBK and RBO2

CBK

RBO2

Extended blanking time

Overall blanking time

0.1 µF

15 kΩ

191.2 ms

211.2 ms

0.1 µF

37.5 kΩ

162.8 ms

182.8 ms

0.1 µF

47 kΩ

159.6 ms

179.6 ms

Note: RBO2 must be always ≥15 kΩ in enable brownout mode, otherwise overload protection may not work.

3.7.4 Brown out Mode

When the AC input voltage is removed, the voltage at the bulk capacitor will fall. When it reaches a point that

the system is greater than the system allowed maximum power, the system may go into over load protection.

However, this kind of protection is not welcome for some of the applications such as auxiliary power for

PC/server system because the output is in hiccup mode due to over load protection (auto restart mode). The

brownout mode is to eliminate this phenomenon. The IC will sense the input voltage through the bulk

capacitor to the BBA pin by 2 potential divider resistors, RBO1 and RBO2 (Figure 34).

When the system is powered up, the bulk capacitor and the Vcc capacitor are charged up at the same time.

When the VCC voltage is charged to > 7 V, the brownout circuit starts to operate (Figure 34). Since the UVLO is

still at low level as the VCC voltage does not reach the 17 V UVLO “ON” voltage. The NAND gate G20 will release

a low signal to the flip flop FF5 and the negative output of FF5 will release a high signal to turn on the switch S3.

The constant load LD6 will start to draw constant current Ichg_BO from the BBA pin. That means the brownout

mode is default “ON” during the system starts up.

C14

0.9V

Control Unit

Brownout

mode

BBA

RBO1

RBO2

Vbulk

Ichg_BO

30µs~60µs

blanking time

UVLO

5µs

blanking

time

FF5

G20

G22

G21

LD6

Figure 34 Brown out detection circuit

Once the system enters the brown out mode, there will be no switching pulse and the IC keeps on monitoring

the BV signal. If the brown out signal is not reset, there is no switching pulse in each restart cycle (Figure 35).

Data Sheet 24 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

10.5V

VCS

VVCC

17V

Fault

detected

Startup and detect

No switching

Figure 35 Brown out mode waveform

The voltage at bulk capacitor Vbulk continues to increase and so is the voltage at BBA. When the BBA voltage

reaches 0.9 V, the output of OPAMP C14 will become low. Through the inverter gate G21, the “S” input of the flip

flop FF5 is changed to high. Then the negative output of FF5 is low. The brownout mode is then “OFF” and the

constant current load LD6 is also “OFF” through the turn-off of the S3. The system will turn on with soft start in

the coming restart cycle when Vcc reaches the Vcc “ON” voltage 17 V.

When there is an input voltage drop, the BBA voltage also drops. When the voltage at BBA pin falls below 0.9 V,

the output of OPAMP C14 is changed to high. The inverter gate G22 will change the high input to low output.

Then the NAND gate G22 will have a high output. The negative output of the flip flop FF5 is then become high.

The constant load LD6 is “ON” again and the IC enters the brownout mode where the Vcc swings between 10.5

V and 17 V without any switching pulse.

The formula to calculate the RBO1 and RBO2 are as below.

RBO1=Vhys/Ichg_BO

RBO2=Vref_BO*RBO1/(VBO_l -Vref_BO)

where VBO_l: input brownout voltage (low point); Vhys: input brownout hysteresis voltage; Vref_BO: IC reference

voltage for brownout; RBO1 and RBO2: resistors divider from input voltage to BBA pin

For example,

Ichg_BO=10 µA, Vref_BO=0.9 V,

Case 1:

if brownout voltage is 70 VACon and 100 VAC off,

then brownout voltage, VBO_l=100 VDC,

hysteresis voltage, VBO_hys=43 VDC,

RBO1=4.3 MΩ, RBO2=39 kΩ

Case 2:

if brownout voltage is 100 VAC on and 120 VAC off,

then brownout voltage, VBO_l=141 VDC,

hysteresis voltage, VBO_hys=28 VDC,

RBO1=2.8 MΩ, RBO2=18 kΩ

Case 3:

if brownout voltage is 120 VAC on and 160 VAC off,

Data Sheet 25 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

then brownout voltage, VBO_l=169 VDC,

hysteresis voltage, VBO_hys=56 VDC,

RBO1=5.6 MΩ, RBO2=30 kΩ

The summary is listed below.

Table 5 Brownout resistors vs VBO_hys

Case

VBO_l

VBO_h

VBO_hys

RBO1

RBO2

100V

143V

43V

4.3MΩ

39KΩ

141V

169V

28V

2.8MΩ

18KΩ

169V

225V

56V

5.6MΩ

30KΩ

Note: The above calculation assumes the tapping point (bulk capacitor) has a stable voltage with no ripple

voltage. If there is ripple in the input voltage, it should take the highest voltage for the calculation;

VBO_l + ripple voltage. Besides that the low side brownout voltage VBO_l added with the ripple voltage at

the tapping point should always be lower than the high side brownout voltage (VBO_h); VBO_h > VBO_l +

ripple voltage. Otherwise, the brownout feature cannot work properly. In short, when there is a high

load running in system before entering brownout, the input ripple voltage will increase and the

brownout voltage will increase (VBO_l = VBO_l + ripple voltage) at the same time. If the VBO_hys is set too

small and is close to the ripple voltage, then the brownout feature cannot work properly (VBO_l = VBO_h).

If the brownout feature is not needed, it needs to tie the BBA pin to the Vcc pin through a current limiting

resistor, 500 kΩ~1 MΩ. The BBA pin cannot be in floating condition. If the brownout feature is disabled with a

tie up resistor, there is a limitation of the capacitor CBK at the BBA pin. It is as below.

Table 6 VCC tie up resistor and CBK_max

VCC tie up resistor

CBK_max

500 kΩ

0.47 uF

1 MΩ

0.22 uF

3.7.5 Action sequence at BBA pin

Since there are 3 functions at the same BBA pin; brownout, extended blanking time and the auto-restart

enable, the actions of sequence are set as per the below table in case of several features happens

simultaneously.

Table 7 Action sequence at BBA pin

2nd 1st

Auto-restart enable

Extended blanking time

Brownout

Auto-restart enable

Brownout

Extended blanking time

Auto-restart enable

Extended blanking time

Brownout

Auto-restart enable

Extended blanking time

Brownout

The top row of the table is the first happened feature and the left column is the second happened feature. For

example,

Case 1:

Data Sheet 26 Revision 1.1

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Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

The “Auto-restart enable” feature happened first and it follows with the “Extended blanking time” feature.

Then the “Auto-restart enable” feature will continue to hold and the “Extended blanking time” feature is

ignored.

Case 2:

The “Extended blanking time” feature happened first and it follows with the “Auto-restart enable” feature.

Then the “Auto-restart enable” feature will take the priority and the “Extended blanking time” feature is

overridden.

Case 3:

The “Extended blanking time” feature happened first and it follows with the “Brownout” feature. Then the

“Extended blanking time” feature will continue to work until it ends. After that if the over load fault is removed

the “Brownout” feature takes the action.

Case 4:

The “Brownout” feature happened first and it follows with the “Auto-restart enable” feature. Then the

“Brownout” feature will continue to work and the “Auto-restart enable” feature is ignored.

One typical case happened is that the “Extended blanking time” feature happened first and it follows with the

“Brownout” feature. If, however, the over load fault is removed before the end of the extended blanking time,

the “Brownout” feature can take action only after 20 ms buffer time.

Data Sheet 27 Revision 1.1

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Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

4 Electrical Characteristics

Note: All voltages are measured with respect to ground (Pin 12). The voltage levels are valid if other ratings

are not violated.

4.1 Absolute Maximum Ratings

Note: Absolute maximum ratings are defined as ratings, which when being exceeded may lead to

destruction of the integrated circuit. For the same reason make sure, that any capacitor that will be

connected to pin 11 (VCC) is discharged before assembling the application circuit. Ta=25°C unless

otherwise specified.

Table 8 Absolute Maximum Ratings

Parameter

Symbol

Limit Values

Unit

Remarks

min.

max.

Drain Source Voltage

VDS

800

Pulse drain current, tp limited by Tjmax

ID_Puls

1.95

Avalanche energy, repetitive tAR limited

by max. Tj=150°C1

EAR

0.024

Avalanche current, repetitive tAR limited

by max. Tj=150°C

IAR

0.95

VCC Supply Voltage

VVCC

-0.3

FBB Voltage

VFBB

-0.3

5.5

BV Voltage

VBV

-0.3

5.5

CS Voltage

VCS

-0.3

5.5

Junction Temperature

-40

150

°C

Controller & CoolMOS™

Storage Temperature

-55

150

°C

Thermal Resistance

(Junction–Ambient)

RthJA

110

K/W

Soldering temperature, wavesoldering

only allowed at leads

Tsold

260

°C

1.6mm (0.063in.) from case

for 10s

ESD Capability (incl. Drain Pin)

VESD

Human body model2

Repetitive avalanche causes additional power losses that can be calculated as PAV=EAR*f

According to EIA/JESD22-A114-B (discharging a 100pF capacitor through a 1.5 kΩ series resistor)

Data Sheet 28 Revision 1.1

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Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

4.2 Absolute Maximum Ratings

Note: Within the operating range the IC operates as described in the functional description.

Table 9 Absolute Maximum Ratings

Parameter

Symbol

Limit Values

Unit

Remarks

min.

max.

VCC Supply Voltage

VVCC

VVCCoff

Max value limited due to

VVCCOVP

Junction Temperature of Controller

TjCon

-40

130

°C

Max value limited due to

thermal shut down of

controller

Junction Temperature of CoolMOS™

TjCoolMOS

-40

150

°C

4.3 Characteristics

4.3.1 Supply Section

Note: The electrical characteristics involve the spread of values within the specified supply voltage and

junction temperature range TJ from – 40 °C to 125 °C. Typical values represent the median values,

which are related to 25°C. If not otherwise stated, a supply voltage of VCC = 17 V is assumed.

Table 10 Supply Section

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

typ.

max.

Start Up Current

IVCCstart

200

300

μA

VVCC =16V

VCC Charge Current

IVCCcharge1

5.0

VVCC = 0V

IVCCcharge2

0.55

0.9

1.60

VVCC = 1V

IVCCcharge3

0.38

0.7

VVCC =16V

Leakage Current of

Start Up Cell and CoolMOS™

IStartLeak

0.2

μA

VDrain = 650V at Tj=100°C1

Supply Current with Inactive Gate

IVCCsup1

1.9

3.2

Supply Current with Active Gate

IVCCsup2

3.0

4.4

IFBB = 0A

Supply Current in

Auto Restart Mode with Inactive Gate

IVCCrestart

320

μA

IFBB = 0A

Supply Current in Active Burst Mode

with Inactive Gate

IVCCburst1

620

950

μA

VFBB = 2.5V

IVCCburst2

620

950

μA

VVCC = 11.5V, VFBB = 2.5V

VCC Turn-On ThresholdVCC Turn-Off

Threshold VCC Turn-On/Off Hysteresis

VVCCon

VVCCoff

VVCChys

16.0

9.8

17.0

10.5

6.5

18.0

11.2

The parameter is not subjected to production test - verified by design/characterization

Data Sheet 29 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

4.3.2 Internal Voltage Reference

Table 11 Internal Voltage Reference

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

typ.

max.

Trimmed Reference Voltage

VREF

4.90

5.00

5.10

measured at pin FBB

IFBB = 0

4.3.3 PWM Section

Table 12 PWM Section

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

typ.

max.

Fixed Oscillator Frequency

fOSC1

100

113

kHz

fOSC2

100

108

kHz

Tj = 25°C

Frequency Jittering Range

fjitter

±4.0

kHz

Tj = 25°C

Frequency Jittering period

Tjitter

4.0

Tj = 25°C

Max. Duty Cycle

Dmax

0.70

0.75

0.80

Min. Duty Cycle

Dmin

VFBB < 0.3 V

PWM-OP Gain

3.05

3.25

3.45

Voltage Ramp Offset

VOffset-Ramp

0.60

VFBB Operating Range Min Level

VFBmin

0.7

VFBB Operating Range Max level

VFBmax

4.3

CS=1 V, limited by

Comparator C41

FBB Pull-Up Resistor

RFB

9.0

15.4

23.0

kΩ

4.3.4 Soft Start time

Table 13 Soft Start time

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

typ.

max.

Soft Start time

tSS

The parameter is not subjected to production test - verified by design/characterization

Data Sheet 30 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

4.3.5 Control Unit

Table 14 Control Unit

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

typ.

max.

Brown out reference voltage for

comparator C14

VBO_ref

0.8

0.9

1.0

Blanking time voltage lower limit for

Comparator C3

VBKC3

0.80

0.90

1.00

Blanking time voltage upper limit for

Comparator C11

VBKC11

4.28

4.50

4.72

Over Load Limit for Comparator C4

VFBC4

4.28

4.50

4.72

Entry Burst select High level for

Comparator C19

VFBC19

4.28

4.50

4.72

Entry Burst select Low level for

Comparator C20

VFBC20

0.40

0.50

0.60

Active Burst Mode

Entry Level for

Comparator C5

10% Pin_max

VFB_burst1

1.51

1.60

1.69

< 7 counts

6.67%

Pin_max

VFB_burst2

1.34

1.42

1.50

8 ~ 39 counts

4.38%

Pin_max

VFB_burst3

1.20

1.27

1.34

40 ~ 191 counts

Active Burst Mode High Level for

Comparator C6a

VFBC6a

3.35

3.50

3.65

In Active Burst Mode

Active Burst Mode Low Level for

Comparator C6b

VFBC6b

3.06

3.20

3.34

Active Burst Mode Level for

Comparator C13

VFBC13

3.85

4.00

4.15

Overvoltage Detection Limit for

Comparator C1

VVCCOVP1

19.5

20.5

21.5

VFBB = 5V, during soft start

Overvoltage Detection Limit for

Comparator C2

VVCCOVP2

25.0

25.5

26.3

Auto-restart enable reference voltage

for Comparator C9

VAE

0.25

0.40

0.45

Charging current for extended

blanking time

Ichg_EB

460

720

864

μA

Charging current for brownout

Ichg_BO

9.0

10.0

10.08

μA

Thermal Shutdown1

TjSD

130

140

150

°C

Controller

Hysteresis for thermal Shutdown1

TjSD_hys

°C

Built-in Blanking Time for Overload

Protection or enter Active Burst Mode

tBK

Timer for entry burst select

tEBS

Spike Blanking Time for Auto-Restart

Protection

tSpike

μs

Note: The trend of all the voltage levels in the Control Unit is the same regarding the deviation except VVCCOVP

and VVCCPD

The parameter is not subject to production test - verified by design/characterization. The thermal shutdown temperature refers to the

junction temperature of the controller.

Data Sheet 31 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

4.3.6 Current Limiting

Table 15 Current Limiting

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

typ.

max.

Peak Current Limitation (incl.

Propagation Delay)

Vcsth

0.98

1.06

1.13

dVsense / dt = 0.6V/µs

(Figure 21)

Peak Current

Limitation during

Active Burst Mode

20% Pin_max

Vcsth_burst1

0.37

0.45

0.51

< 7 counts

13.3%

Pin_max

Vcsth_burst2

0.30

0.37

0.44

8 ~ 39 counts

9.6% Pin_max

Vcsth_burst3

0.23

0.31

0.37

40 ~ 191 counts

Leading Edge

Blanking

Normal mode

tLEB_normal

220

Burst mode

tLEB_burst

180

CS Input Bias Current

ICSbias

-1.5

-0.2

μA

VCS =0V

4.3.7 CoolMOS™ Section

Table 16 CoolMOS™ Section

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

typ.

max.

Drain Source Breakdown Voltage

V(BR)DSS

800

870

Tj = 25°C

Tj = 110°C1

Drain Source On-Resistance

RDSon

4.70

10.45

12.76

5.18

11.50

14.04

Ω

Tj = 25°C

Tj=125°C1

Tj=150°C1 at ID = 0.58 A

Effective output capacitance,

energy related

Co(er)

7.2

VDS = 0 V to 480 V

Rise Time2

trise

Fall Time2

tfall

The parameter is not subjected to production test - verified by design/characterization

Measured in a Typical Flyback Converter Application

Data Sheet 32 Revision 1.1

2017-06-13

Fixed-Frequency, 800V CoolSET™ in DS0-12 Package

5 CoolMOS™ Performance Characteristics

Figure 36 Safe Operating Area (SOA) curve for ICE3AR4780JG

Figure 37 SOA temperature derating coefficient curve