AP3105NAKTR-G1 - DIODES INC

AP3105NA/NV/NL/NR

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COST EFFECTIVE GREEN PWM CONTROLLER

Description

The AP3105NA/NV/NL/NR is a low startup current, current mode

PWM controller with green-mode power-saving operation. The PWM

switching frequency at normal operation is set with 65kHz typically

and the dithering of frequency will also improve the EMI feature.

When the load decreases, the frequency will reduce and when at a

very low load, the IC will enter the ‘burst mode’ to minimize switching

loss.

About 20kHz frequency switching is to avoid the audible noise as well

as reducing the standby loss. The skip mode point can be adjusted

through the external resistor connected to the current sense resistor.

The AP3105NA/NV/NL/NR features a lot of functions such as the

Leading-Edge Blanking (LEB) of the current sensing, internal slope

compensation and several protection functions including cycle-by-

cycle current limit (OCP), VCC Over Voltage Protection (VOVP), OTP

and OLP protection. The versatile latch function can be set by the

customer through few components.

This IC is available in SOT-23-6 package.

Features

 Very Low Start-up Current

 Current Mode Control

 Non-audible-noise Green-mode Control

 Skip Mode Adjustable

 Internal Slope Compensation

 Soft Start During Startup Process

 Frequency Fold Back for High Average Efficiency

 Secondary Short Winding Protection with FOCP

 Soft Switching for Reducing EMI

 VCC Maintain Mode

 Latch Function for OTP/OVP

 Useful Pin Fault Protection:

SENSE Pin Floating

CTRL Pin Short to Ground

FB/Opto-coupler Open/Short

 Comprehensive System Protection Feature:

VCC Over Voltage Protection (VOVP)

Over Load Protection (OLP)

 Mini Size with Packages

 Pin to Pin Compatible with AP3103

Pin Assignments

K Package

(SOT-23-6)

Applications



Switching AC-DC Adapter/Charger

 ATX/BTX Auxiliary Power

 Set-top Box(STB) Power Supply

 Open Frame Switching Power Supply

1

2

34

5

Pin 1 Mark

6

GND

FB

CTRL

GATE

VCC

SENSE

AP3105NA/NV/NL/NR

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Typical Applications Circuit

~

+

-

VCC

GND

GATE

FB

SENSE

CTRL

~

AZ431

AP3105NA/

NV/NL/NR

L2

T1

R13 C7

C6

C8

R14

R15

R16

R17

R18

C9

U2

C10

R12R11

R10

R9

C5R6

R19

C4

R5

R4

C2

C1

VR1

U1

NTC

R2 R3

F1

R7

C3

C11

NTC

R8

Pin Descriptions

Pin Number Pin Name Function

1 GND Signal ground. Current return for driver and control circuits

2 FB Feedback. Directly connected to the opto-coupler

3 CTRL

Latch trigger if this pin voltage drops below a threshold or over another threshold, leave CTRL pin

open if this function is not needed. Connecting a NTC thermistor to GND can achieve OTP

protection

4 SENSE Current Sense

5 VCC Supply voltage of driver and control circuits

6 GATE Gate driver output

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Functional Block Diagram

GND

GATE

250 ns LEB

Driver

13 V

QD

CLK

RB

DFF

OSC with

Fr equency Jitter

0.95V

VCC_OVP

OLP

VCC

32 V

28 V

VCC_OVP

OVP

UVLO

15. 5V

8.6V Inter nal

Bias

0.5 V

Auto

Recovery

Protection

AP3105NA/NV/NL/NR

100 uA

Line

Compensation

FB

R

2R

Burst

PWM

1. 25V

Soft Start

0.5V

CTRL_H

1. 8V

Latch -off

Protection

OCP

64ms Delay

OLP

FOCP

2.5 V

3. 6V0.6 V

10 K

CTRL_H

CTRL_L

CTR L_L

1

2

53

6

CTRL

SENSE

4

AP3105NA/NV/NL/NR

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Absolute Maximum Ratings

(Note 1)

Symbol Parameter Rating Unit

V

CC

Power Supply Voltage 30 V

I

O

Gate Output Current 350 mA

V

FB

, V

SENSE

, V

CTRL

Input Voltage to FB, SENSE, CTRL -0.3 to 7 V

θ

JA

Thermal Resistance (Junction to Ambient) 250 °C/W

P

D

Power Dissipation at T

A

< +25°C 500 mW

T

J

Operating Junction Temperature -40 to +150 °C

T

STG

Storage Temperature Range +150 °C

–

ESD (Human Body Model) 3000 V

–

ESD (Machine Model) 300 V

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress

ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating

Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

Symbol Parameter Min Max Unit

V

CC

Supply Voltage 10 25 V

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Electrical Characteristics

(@T

A

= +25°C, V

CC

= 16V, unless otherwise specified.)

Symbol Parameter Conditions Min Typ Max Unit

Supply Voltage (VCC Pin)

I

STARTUP

Startup Current – 2 5 20 μA

I

CC

Operating Supply Current

V

FB

=0V, C

L

=1nF 0.5 0.85 1.2

mA

V

FB

=3V, C

L

=0nF 0.6 1.2 2.0

–

U

VLO (on)

–14.5 15.5 16.5 V

–

V

CC

Maintain –9.7 10.2 10.7 V

–

U

VLO

(off)

–7.6 8.6 9.6 V

–

V

CC

OVP –27 28.5 30 V

–

V

CC

Clamp I

CC

=5mA 31 34 – V

PWM Section/Oscillator Section

–

Maximum Duty Cycle –70 75 80 %

–

Oscillation Frequency –60 65 70 kHz

–

Green Mode Frequency –20 –

30 kHz

–

Frequency Temperature

Stability

-20

o

C to 125

o

C (Note 2)

– –

5 %

–

Frequency Voltage Stability V

CC

=12V to 30V – –

3 %

–

Frequency Dithering – ±4 ±6 ±8 %

Current Sense Section (SENSE Pin)

V

CS

Maximum SENSE Voltage V

FB

=3.6V 0.9 0.95 1 V

–

FOCP Voltage –1.65 1.8 1.95 V

–

LEB Time of SENSE –150 250 350 ns

–

Delay to Output (Note 2) –– 100 – ns

–

Soft-start Time –3 5 8 ms

Feedback Input Section (FB Pin)

–

The Ratio of Input Voltage to

Current Sense Voltage

–2.5 3 3.5 V/V

–

Input Impedance –7 10 13 kΩ

–

Source Current V

FB

=0V -0.75 -0.5 -0.25 mA

–

Green Mode Threshold –– 2.1 – V

–

Input Voltage for Zero Duty –1.3 1.55 1.8 V

Output Section (GATE Pin)

–

Output Low Level I

O

=20mA, V

CC

=12V – – 1 V

–

Output High Level I

O

=20mA, V

CC

=12V 8 – – V

–

Output Clamping – 11 13 15 V

–

Rising Time (Note 2) C

L

=1nF, V

CC

=13V – 150 250 ns

–

Falling Time (Note 2) C

L

=1nF, V

CC

=13V – 50 100 ns

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Electrical Characteristics

(Cont.) (@T

A

= +25°C, V

CC

= 16V, unless otherwise specified.)

Protection Section (CTRL Pin)

–

Source Current –90 100 110 μA

–

Internal Reference Voltage –– 1.5 – V

–

Low Threshold Trigger for

Latch

–0.47 0.5 0.53 V

–

High Threshold Trigger for

Latch

–2.35 2.5 2.65 V

–

Pull-up Current (Note 3) – – –

2 mA

Delay Time Section

–

Delay of Short Circuit

Protection – 54 64 74 ms

–

Delay of Hiccup Protection VCC OVP – 25 – μs

Note 2: Guaranteed by design.

Note 3: The sourcing current of CTRL pin must be limited below 5mA.Otherwise it may cause permanent damage to the device.

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Performance Characteristics

Startup Voltage vs. Ambient Temperature Shutdown Voltage vs. Ambient Temperature

Startup Current vs. Ambient Temperature Operating Current vs. Ambient Temperature

CTRL Utilization for Latch

CTRL

VCC

NTC

CTRL

VCC

NTC

VCC

CTRL

NTC

OVP and OTP OVP OTP

-40 -20 0 20 40 60 80 100 120 140

13.0

13.5

14.0

14.5

15.0

15.5

16.0

16.5

17.0

17.5

18.0

Startup Voltage (V)

Ambient Temperature (oC)

-40 -20 0 20 40 60 80 100 120 140

7.0

7.5

8.0

8.5

9.0

9.5

10.0

Shutdown Voltage (V)

Ambient Temperature (oC)

-40 -20 0 20 40 60 80 100 120 140

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

7.0

7.5

8.0

Startup Current (A)

Ambient Temperature (oC)

-40 -20 0 20 40 60 80 100 120 140

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Operating Current (mA)

Ambient Temperature (oC)

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Operation Description

The AP3105NA/NV/NL/NR is specifically designed for off-line AC-

DC power supply used in LCD monitor, notebook adapter and

battery charger applications. It offers a cost effective solution with a

versatile protection function.

Start-up Current and UVLO

The start-up current of AP3105NA/NV/NL/NR is optimized to realize

ultra low current (5



A typical) so that VCC capacitor can be

charged more quickly. The direct benefit of low start-up current is

the availability of using large start-up resistor, which minimizes the

resistor power loss for high voltage AC input.

An UVLO comparator is included in AP3105NA/NV/NL/NR to detect

the voltage on VCC pin. It ensures that AP3105NA/NV/NL/NR can

draw adequate energy from hold-up capacitor during power-on. The

turn-on threshold is 15.5V and the turn-off threshold is 8.6V.

Current Sense Comparator and PWM Latch

The AP3105NA/NV/NL/NR operates as a current mode controller,

the output switch conduction is initiated by every oscillator cycle and

is terminated when the peak inductor current reaches the threshold

level established by the FB pin. The inductor current signal is

converted to a voltage signal by inserting a reference sense resistor

R

S

. The inductor current under normal operating conditions is

controlled by the voltage at FB pin. The relation between peak

inductor current (I

PK

) and V

FB

is:

SFBPK RVI 3/)8.0( 

Moreover, FOCP with 1.8V threshold is only about 100ns delay,

which can avoid some catastrophic damages such as secondary

rectifier short test. Few drive cycles can alleviate the destruction

range and get better protection.

Leading-edge Blanking

A narrow spike on the leading edge of the current waveform can

usually be observed when the power MOSFET is turned on. A

250ns leading-edge blank is built-in to prevent the false-triggering

caused by the turn-on spike. During this period, the current limit

comparator is disabled and the gate driver can not be switched off.

At the time of turning on the MOSFET, a negative undershoot

(maybe larger than -0.3V) can occur on the SENSE pin. So it is

strongly recommended to add a small RC filter or at least connect a

resistor “R” on this pin to protect the IC (Shown as Figure 1).

FB

SENSE

GATE

GND

CTRL 6

1

3

4

AP3105NA/

NV/NL/NR

VCC

5

2

Large undershoot (mor e than

-0.3 V) m ay damage the SENSE pin

R

C

Necessary

Figure 1

Built-in Slope Compensation

It is well known that a continuous current mode SMPS may become

unstable when the duty cycle exceeds 50%. The built-in slope

compensation can improve the stability, so there is no need for

design engineer to spend much time on that.

FB Pin and Short Circuit Protection

This pin is normally connected to the opto-coupler and always

paralleled with a capacitor for loop compensation. When the voltage

at this pin is greater than 4.2V and lasts for about 64ms, the IC will

enter the protection mode. For AP3105NA/NV/NR, the system will

enter hiccup mode to wait the V

CC

decreasing to low UVLO level,

then the IC will try to restart until the failure removed. And when this

voltage is less than 1.55V, the IC will stop the drive pulse

immediately. Therefore, this feature can be used for short circuit

protection, which makes the system immune from damage.

Normally, output short makes the V

FB

value to the maximum

because the opto-coupler is cut off.

V

CC

Maintain Mode

During light load or step load, V

FB

will drop and be lower than 1.55V,

thus the PWM drive signal will be stopped, and there is no more

new energy transferred due to no switching. Therefore, the IC

supply voltage may reduce to the shutdown threshold voltage and

system may enter the unexpected restart mode. To avoid this, the

AP3105NA/NV/NL/NR hold a so-called V

CC

maintain mode which

can supply energy to VCC.

When V

CC

decreases to a setting threshold, the V

CC

maintain

comparator will output some drive signal to make the system switch

and provide a proper energy to VCC pin. The V

CC

maintain function

will cooperate the PWM and burst mode loop which can make the

output voltage variation be within the regulation. This mode is very

useful for reducing startup resistor loss and achieving a better

standby performance with a low value VCC capacitor. The V

CC

is

not easy to touch the shutdown threshold during the startup process

and step load. This will also simplify the system design. The

normal VCC voltage is suggested to be designed a little higher than

V

CC

maintain threshold thus can achieve the best balance between

the standby and step load performance.

AP3105NA/NV/NL/NR

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Operation Description

(Cont.)

System Protection and Pin Fault Protection

The AP3105NA/NV/NL/NR provides versatile system and pin fault

protections. The OCP comparator realizes the cycle-by-cycle

current limiting (OCP). In universal input line voltage, the IC realizes

the constant over load protection (OLP). VCC over voltage

protection can be applied as the primary OVP or opto-coupler

broken protection. The AP3105NA/NV/NL/NR also has pin fault

connection protection including floating and short connection. The

floating pin protection include the SENSE, FB, etc.. The short pin

protection includes the CTRL pin short protection. When these pins

are floated or CTRL pin is shorted to ground, PWM switching will be

disabled, thus protecting the power system.

Latch Protection Function

For some applications, the system requires the latch protection

function. The CTRL pin has two kinds of modes to trigger the latch

protection: high level trigger and low level trigger. The low threshold

is 0.5V and high threshold voltage is 2.5V. Some version will have

only one mode. Once the latch protection is triggered, the IC will

disable the output signal, and the bulk capacitor provides the

energy to IC through the startup resistor to ensure the IC disable

the output (latch mode). This mode will be not released until the AC

input is shut off. So, the de-latch time is mainly depending on the

HV startup bulk capacitor value. Therefore, if the system wants a

short de-latch time, it is better for the startup resistor take power

from the point before the rectifier bridge as illustrated in Figure 2.

VCC

GND

FB

CTRL

AP3105NA/NV/NL/NR

SENSE

AC Mains

(90V to 265V)

C

BUS

GATE

1

2

3

4

5

6

Figure 2

AP3105NA/NV/NL/NR

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Ordering Information

AP3105

-

¯

Circuit Type

Package Part Number Marking ID Packing Type

SOT-23-6

AP3105NAKTR-G1 GKN Tape & Reel

AP3105NVKTR-G1 GKO Tape & Reel

AP3105NLKTR-G1 GKP Tape & Reel

AP3105NRKTR-G1 GKQ Tape & Reel

BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and green.

*Product Version Classification (with Different Protection Functions)

Product Version Frequency VOVP OLP&SOCP CTRL (Low) CTRL (High)

AP3105NA 65kHz Auto-Recoverable Auto-Recoverable Latch Auto-Recoverable

AP3105NV 65kHz Latch Auto-Recoverable Latch Latch

AP3105NL 65kHz Latch Latch Latch Latch

AP3105NR 65kHz Auto-Recoverable Auto-Recoverable Auto-Recoverable Latch

G1: Green

TR: Tape & Reel

Product Version*

NA: AP3105NA

NV: AP3105NV

NL: AP3105NL

NR: AP3105NR

Package

K: SOT-23-6

AP3105NA/NV/NL/NR

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Package Outline Dimensions

(All dimensions in mm(inch).)

SOT-23-6

2.820(0.111)

3.100(0.122)

2.650(0. 104)

3.000(0. 118)

1.500(0.059)

1.700(0.067)

0.950(0.037)TYP

1.800(0. 071)

2.000(0. 079)

0.300(0.012)

0.500(0. 020)

0.700(0.028)REF

0.100(0.004)

0.200(0. 008)

0°

8°

0.200(0.008)

0.300(0.012)

0.600(0.024)

0.000(0.000)

0.150(0.006)

0.900(0.035)

1.300(0.051)

1.450(0.057)

MAX

123

456

Pin 1 Mark

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Suggested Pad Layout

SOT-23-6

EE

GZ

Y

X

Dimensions Z

(mm)/(inch)

G

(mm)/(inch)

X

(mm)/(inch)

Y

(mm)/(inch)

E

(mm)/(inch)

Value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.037

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final and determinative format released by Diodes Incorporated.

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labeling can be reasonably expected to result in significant injury to the user.

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failure of the life support device or to affect its safety or effectiveness.

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