KA5Q0740 - Fairchild Semiconductor

www.fairchildsemi.com

Rev.1.0.4

Features

• Quasi Resonant Converter Controller

• Int ernal Burst Mode Control ler for Stand- by Mode

• Pulse by Pulse Current Limiting

• Over Current Latch Protection

• Over Voltage Protection (Vsync : Min. 11V)

• Internal Thermal Shutdown Function

• Unde r Voltage Lo ck out

• Internal High Voltage Sense FET

• Auto- Re st art Mo de

Description

The Fairchild Power Swit ch(FPS) product family is speci ally

designed for an off-line SMPS with minimal external

components. The Fairchild Power Switch(FPS) consists of a

high voltage power SenseFET and a current mode PWM IC.

The integrated PWM controller includes the fixed oscillator,

the under voltage lock out, the leading edge blanking, the

optimized gate turn-on/turn-of f driver, the thermal shut down

protection, the over voltage protection, and the temperature

compensated precision current sources for loop compensation

and fault protection circuitry. Compared to a discrete

MOSFET and a controller or a RCC switching converter

solutions, a F airchild Power Switch(FPS ) can reduce the total

number of components, design size, and weight, so it will

improve ef ficiency, productivity, and system reliabilit y. It has

a basic platform well suited for cost-effective design in a

quasi-resonant converter as a C-TV power supply.

TO-220F-5L

1. Drain 2. GND 3. VCC

4. Feedback 5. Sync

Internal Block Diagram

Rsense

11V on

12V off

VREF

Internal

BIAS

LEB

450ns

SQB

Rof

Power

Reset

OVP

OLP

7.5V

12V

Sync

UVLO

15V/9V

Burst Mode

3.5V/1.25V

SYNC

SYNCSYNC

SYNC

2.5R

Offset

Thermal

Thermal Thermal

Thermal

Shut Down

Shut DownShut Down

Shut Down

RPower on Reset

(VCC=6.5V)

Delay

80ns

OCL

FEEDBACK

FEEDBACKFEEDBACK

FEEDBACK

VCC

VCCVCC

VCC DRAIN

DRAINDRAIN

DRAIN

SOURCE

SOURCESOURCE

SOURCE

Normal Mode

4.6V/2.6V

OSC

Idelay

Ifb

VREF

32V 1%

Ron

Roff

KA5Q0740RT

Fairchil d Power Swi tch(FPS)

KA5Q0740RT

Absolute Maximum Ratings

(Ta=25°C, unless otherwise specified)

Notes:

1. Tj = 25°C to 150°C

2. Repetitive rating: Pulse width limited by maximum junction temperature

3. L = 30mH, VDD = 50V, RG = 25Ω, starting Tj = 25°C

4. L = 13uH, starting Tj = 25°C

Parameter Symbol Value Unit

Drain-Gate Voltage (R

=1MΩ)V

DGR

400 V

Gate-Source (GND) Voltage V

±30 V

Drain Current Pulsed

(2)

18.4 A

Single Pulsed Avalanch Current

(3)

(Energy

(2)

) 20(360) A(mJ)

Continuous Drain Current (Tc = 25°C) I

4.6 A

Continuous Drain Current (T

=100°C) I

2.9 A

Supply Voltage V

40 V

Analog Input Voltage Range V

sync

-0.3 to 13V V

-0.3 to V

Total Power Dissipation P

42 W

Derating 0.33 W/°C

Operating Junction Temperature T

+160 °C

Operating Ambient Temperature T

-25 to +85 °C

Storage Temperature Range T

STG

-55 to +150 °C

Thermal Resistance R

thjc

2.98 °C/W

KA5Q0740RT

Electrical Characteristics (SFET Part)

(Ta=25°C unless otherwise specified)

Note:

1. Pulse test : Pulse width ≤ 300µS, duty ≤ 2%

Parameter Symbol Condition Min. Typ. Max. Unit

Drain-Source Breakdown Voltage BV

DSS

= 0V, I

= 50µA 400 - - V

Zero Gate Voltage Drain Current I

DSS

= Max, Rating, V

= 0V - - 200 µA

= 0.8*Max., Rating

= 0V, T

= 85°C- - 300 µA

Static Drain-source on Resistance

(Note)

DS(ON)

= 10V, I

= 2.3A - 0.9 1.1

Ω

Input Capacitance Ciss

= 0V, V

= 25V,

f = 1MHz

- 710 -

pFOutput Capacitance Coss - 90 -

Reverse Transfer Capacitance Crss - 10 -

Turn on Delay Time td(on) V

= 0.5BV

DSS

, I

= 7.0A

(MOSFET switching

time are essentially

independent of operating

temperature)

-15-

Rise Time tr - 55 -

Turn Off Delay Time td(off) - 55 -

Fall Time tf - 50 -

Total Gate Charge

(Gate-Source+Gate-Drain) Qg V

= 10V, I

= 7.0A,

= 0.5B V

DSS

(MOSFET

Switching time are Essentially

independent of operating

temperature)

-2026

Gate-Source Charge Qgs - 4.0 -

Gate-Drain (Miller) Charge Qgd - 7.3 -

KA5Q0740RT

Electrical Characteristics

(Continued)

(Ta=25°C unless otherwise specified)

Note:

1. These parameters is the current flowing in the Control IC.

2. These parameters, although guaranteed, are tested in EDS(wafer test) process.

3. These parameters indicate Inductor Current.

Parameter Symbol Condition Min. Typ. Max. Unit

UVLO SECTION

Start Threshold Voltage V

START

= GND 141516 V

Stop Threshold Voltage V

STOP

= GND 8 9 10 V

OSCILLATOR SECTION

Initial Frequency F

OSC

- 182022kHz

Voltage Stability F

STABLE

12V ≤ Vcc ≤ 23V 0 1 3 %

Temperature Stability (Note2) ∆F

OSC

-25°C ≤ Ta ≤ 85°C0±5±10%

Maximum Duty Cycle D

MAX

- 929598%

Minimum Duty Cycle D

MIN

---0%

FEEDBACK SECTION

Feedback Source Current I

= GND 0.7 0.9 1.1 mA

Shutdown Feedback Voltage V

Vfb ≥ 6.9V 6.9 7.5 8.1 V

Shutdown Delay Current I

DELAY

= 5V 456µA

PROTECTION SECTION

Over Voltage Protection V

OVP

Vsync ≥ 11V 11 12 13 V

Over Current Latch Voltage (Note2) V

OCL

- 0.9 1.0 1.1 V

Thermal Shutdown Temp. T

- 140 160 - °C

KA5Q0740RT

Electrical Characteristics

(Continued)

(Ta=25°C unless otherwise specified)

Note:

1. These parameters is the current flowing in the Control IC.

2. These parameters, although guaranteed, are tested in EDS(wafer test) process.

3. These parameters indicate Inductor Current.

Parameter Symbol Condition Min. Typ. Max. Unit

SYNC SECTION

Normal Sync High Threshold Voltage V

NSH

Vcc = 16V, Vfb = 5V 4.0 4.6 5.2 V

Normal Sync Low Threshold Voltage V

NSL

Vcc = 16V, Vfb = 5V 2.3 2.6 2.9 V

Burst Sync High Threshold Voltage V

BSH

Vcc = 10.5V, Vfb = 0V 3.2 3.6 4.0 V

Burst Sync Low Threshold Voltage V

BSL

Vcc = 10.5V, Vfb = 0V 1.1 1.3 1.5 V

BURST MODE SECTION

Burst mode Low Threshold Voltage V

BURL

Vfb = 0V 10.4 11.0 11.6 V

Burst mode High Threshold Voltage V

BURH

Vfb = 0V 11.4 12.0 12.6 V

Burst mode Enable Feedback Voltage V

BEN

Vcc = 10.5V 0.7 1.0 1.3 V

Burst mode Peak Current Limit I

BU_PK

Vcc = 10.5V 0.65 0.85 1.1 A

PRIMARY SIDE REGULATION SECTION

Primary Regulation Threshold Voltage V

Ifb = 700uA, Vfb = 4V 32.0 32.5 33.0 V

Primary Regulation Transconductance G

- 2.0 2.6 - mA/V

CURRENT LIMIT(SELF-PROTECTION)SECTION

Peak Current Limit(Note3) I

- 4.4 5.0 5.6 A

TOTAL DEVICE SECTION

Start Up Current I

START

Vfb = GND, V

= 14V - 0.1 0.2 mA

Operating Supply Current (Note1)

Vfb = GND, V

= 16V

-1018mAI

OP(MIN)

Vfb = GND, V

= 10V

OP(MAX)

Vfb = GND, V

= 28V

KA5Q0740RT

Typical Performance Characteristics

Figure 1. Start Voltage Figure 2. Stop Voltage

Figure 3. Stand by Curre nt Figure 4. Operating Current

Figure 5. Initial Frequency Figure 6. Maximum Duty

0.85

0.90

0.95

1.00

1.05

1.10

-25!0!25!50!75!100!125!150!

Tem p.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Tem p.(ºC)

0.80

0.87

0.94

1.01

1.08

-25!0!25!50!75!100!125!150!

Tem p.(ºC)

0.85

0.90

0.95

1.00

1.05

1.10

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.85

0.90

0.95

1.00

1.05

1.10

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Temp.(ºC)

KA5Q0740RT

Typical Performance Characteristics

(Continued)

Figure 7. Feedback Offset Voltage Figure 8. Feedbac k So urce Curre nt

Figure 9. Over Voltage Prote ction

Figure 10. Shutdown Feedback Voltage

Figur e 11. ShutDown Delay C urrent Figure 12. Burst Mode Enable Feedback Voltage

0.00

0.30

0.60

0.90

1.20

1.50

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.80

0.88

0.96

1.04

1.12

1.20

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.85

0.90

0.95

1.00

1.05

1.10

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.60

0.80

1.00

1.20

1.40

-25!0!25!50!75!100!125!150!

Temp.(ºC)

KA5Q0740RT

Typical Performance Characteristics

(Continued)

Figure 13. Burst Mode Low Threshold Voltage Figure 14. Bu rst Mode High Threshold Voltage

Figure 15. Burst Mode Sync. High Threshold Voltage Figure 16. Burst Mode Sync. Low Threshold Voltage

Figure 17. Primary Voltage Figure 18. Pr imary Mode Gain

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!

Temp.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Tem p.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Tem p.(ºC)

0.80

0.88

0.96

1.04

1.12

1.20

-25!0!25!50!75!100!125!150!

Tem p.(ºC)

KA5Q0740RT

Typical Performance Characteristics

(Continued)

Typical Performance Characteristics(MOSFET Part)

Figure 19. Peak Current Limit Figur e 20. Burst Mode Peak Current Limit

Figure 21. Normal Mode Sync. High Threshold Voltage Figure 21. Normal Mode Sync. Low Threshold Voltage

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Tem p.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Temp.(ºC)

0.90

0.94

0.98

1.02

1.06

1.10

-25!0!25!50!75!100!125!150!

Tem p.(ºC)

25 50 75 100 125 150

100

200

300

400

500

AVALANCHE ENERGY E

[mJ]

CHANNEL TEMPERATURE T

[]

EAS-TCH

-5

-4

-3

-2

-1

-2

-1

Notes :

1. Z

θJC

(t) = 1.32 /W Max.

2. Duty Factor, D=t

3. T

- T

= P

* Z

θJC

(t)

single pulse

D=0.5

0.02

0.2

0.05

0.1

0.01

θJC

(t), Thermal Response

, Square Wave Pulse Duration [sec]

Figure 23. Transient Thermal Response Curve

Figure 22. Tempera ture (TC) vs. Eas Curve

KA5Q0740RT

Package Dimensions

TO-220F-5L

KA5Q0740RT

Package Dimensions

(Continued)

TO-220F-5L(Forming)

KA5Q0740RT

8/25/03 0.0m 001

Stock#DSxxxxxxxx

 2003 Fairchild Semiconductor Corporation

LIFE SU PP ORT POL ICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES

OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR

CORPORATION. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body,

or (b) support or sustain life, and (c) whose failure to

perform when properly used in accordance with

instructions for use provided in the labeling, can be

reasonably expected to result in a significant injury of the

user.

2. A critical component in any component of a life support

device or system whose failure to perform can be

reasonably expected to cause the failure of the life support

device or system, or to affect its safety or effectiveness.

www.fairchildsemi.com

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY

PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY

LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER

DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

Ordering Information

TU : Non Forming Type

YDTU : Forming Type

Product Number Package Operating Temp.

KA5Q0740RTTU TO-220F-5L -25°C to +85°C

KA5Q0740RTYDTU TO-220F-5L(Forming)