Fairchild FSQ0265RN service manual

FSQ0365, FSQ0265, FSQ0165, FSQ321

FSQ0365/0265/0165/321 — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter

August 2011

Green Mode Fairchild Power Switch (FPS™)

for Valley Switching Converter – Low EMI and High Efficiency

Features

 Optimized for Valley Switching Converter (VSC)

 Low EMI through Variable Frequency Control and

Inherent Frequency Modulation

 High Efficiency through Minimum Voltage Switching

 Narrow Frequency Variation Range Over Wide Load

and Input Voltage Variation

 Advanced Burst-Mode Operation for Low Standby

Power Consumption

 Pulse-by-Pulse Current Limit

 Protection Functions: Overload Protection (OLP),

Over-Voltage Protection (OVP), Abnormal OverCurrent Protection (AOCP), Internal Thermal Shutdown (TSD)

 Under-Voltage Lockout (UVLO) with Hysteresis

 Internal Startup Circuit

 Internal High-Voltage SenseFET: 650V

 Built-in Soft-Start: 15ms

Applications

Description

A Valley Switching Converter generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The FSQ-series is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for valley switching operation with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, under-voltage lockout, Leading-Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry.

Compared with discrete MOSFET and PWM controller solutions, the FSQ-series reduces total cost, component count, size and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform for cost-effective designs of valley switching fly-back converters.

Related Application Notes

AN-4137 - Design Guidelines for Offline Flyback



Converters Using Fairchild Power Switch (FPS™)

 AN-4141 - Troubleshooting and Design Tips for

Fairchild Power Switch (FPS™) Flyback Applications

 Power Supplies for DVP Player, DVD Recorder,

Set-Top Box

 Adapter

 Auxiliary Power Supply for PC, LCD TV, and PDP TV

 AN-4147 - Design Guidelines for RCD Snubber of

Flyback Converters

 AN-4150 - Design Guidelines for Flyback

Converters Using FSQ-series Fairchild Power Switch (FPS™)

 AN-4134 - Design Guidelines for Off-line Forward

Converters Using Fairchild Power Switch (FPS™)

Ordering Information

(3)

(1)

Open

Frame

(4)

FSDM0265RN

FSDM0265RNB

FSDM0365RN

FSDM0365RNB

Maximum Output Table

Part Number Package

Operating

Temperature

Current

Limit

R

DS(ON)

(Max.)

230VAC ±15%

Adapter

(3)

(2)

85-265VAC

Open

Frame

(4)

Adapter

FSQ321 8-DIP

FSQ321L 8-LSOP

-40 to +85°C 0.6A 19Ω 8W 12W 7W 10W

FSQ321LX

8-LSOP (Tape &

Reel)

FSQ0165RN 8-DIP

FSQ0165RL 8-LSOP

-40 to +85°C 0.9A 10Ω 10W 15W 9W 13W FSDL0165RN

FSQ0165RLX

8-LSOP (Tape &

Reel)

FSQ0265RN 8-DIP

FSQ0265RL 8-LSOP

FSQ0365RN 8-DIP

FSQ0365RL 8-LSOP

-40 to +85°C 1.2A 6Ω 14W 20W 11W 16W

-40 to +85°C 1.5A 4.5Ω 17.5W 25W 13W 19W

Notes:

1. The junction temperature can limit the maximum output power.

2. 230V

or 100/115VAC with voltage doubler. The maximum power with CCM operation

AC

3. Typical continuous power in a non-ventilated, enclosed adapter measured at 50C ambient temperature.

4. Maximum practical continuous power in an open-frame design at 50C ambient temperature.

FSQ0365/0265/0165/321 — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter

Replaces

Devices

FSDL321

FSDM311

Application Circuit

AC

IN

Sync

V

PWM

fb

FSQ0365/0265/0165/321 — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter

Vo

V

str

V

cc

Drain

GND

Internal Block Diagram

0.35/0.55 V

Burst

V

ref

CC

I

FB

V

SD

Sync

V

ovp

delay

3R

6V

Vfb

3

Figure 1. Typical Flyback Application

Sync

4

+

-

R

0.7V/0.2V

SoftStart

2.5 s Time Delay

+

-

PWM

TSD

VCCGood

OSC

LEB

200ns

SQQ

R

SQQ

R

Vstr

5

V

ref

VCCGood

AOCP

Gate

Driver

Vcc

2 8

+

-

8V/12V

V

OCP

(1.1V)

Drain

76

1

GND

FSQ0365RN Rev.00

Figure 2. Internal Block Diagram

Pin Assignments

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin# Name Description

1 GND SenseFET source terminal on primary side and internal control ground.

Positive supply voltage input. Although connected to an auxiliary transformer winding,

2 VCC

3 Vfb

4 Sync

5 Vstr

6, 7, 8 Drain

current is supplied from pin 5 (Vstr) via an internal switch during startup (see Figure 2).

It is not until V

reaches the UVLO upper threshold (12V) that the internal startup switch

CC

opens and device power is supplied via the auxiliary transformer winding.

The feedback voltage pin is the non-inverting input to the PWM comparator. It has a

0.9mA current source connected internally while a capacitor and opto-coupler are typically connected externally. There is a time delay while charging external capacitor C to 6V using an internal 5A current source. This delay prevents false triggering under transient conditions, but still allows the protection mechanism to operate under true overload conditions.

This pin is internally connected to the sync-detect comparator for valley switching. Typically the voltage of the auxiliary winding is used as Sync input voltage and external resistors and capacitor are needed to make delay to match valley point. The threshold of the internal sync comparator is 0.7V/0.2V.

This pin is connected to the rectified AC line voltage source. At startup, the internal switch supplies internal bias and charges an external storage capacitor placed between the Vcc pin and ground. Once the V

reaches 12V, the internal switch is opened.

CC

The drain pins are designed to connect directly to the primary lead of the transformer and are capable of switching a maximum of 650V. Minimizing the length of the trace connecting these pins to the transformer decreases leakage inductance.

from 3V

fb

FSQ0365/0265/0165/321 — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. T

Symbol Parameter Min. Max. Unit

V

Vstr Pin Voltage 500 V

STR

V

Drain Pin Voltage 650 V

DS

V

Supply Voltage 20 V

CC

V

Feedback Voltage Range -0.3 9.0 V

FB

V

Sync Pin Voltage -0.3 9.0 V

Sync

IDM Drain Current Pulsed

EAS Single Pulsed Avalanche Energy

P

Total Power Dissipation 1.5 W

D

T

Recommended Operating Junction Temperature -40 Internally Limited

J

TA Operating Ambient Temperature -40 +85

T

Storage Temperature -55 +150

STG

ESD

Human Body Model; JESD22-A114

Machine Model; JESD22-A115

Notes:

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

6. L=51mH, starting T

=25°C.

J

(6)

(7)

=25°C, unless otherwise specified.

A

FSQ0365 12.0

FSQ0265 8.0

FSQ0165 4.0

FSQ321 1.5

FSQ0365 230

FSQ0265 140

FSQ0165 50

FSQ321 10

CLASS 1C

CLASS B

A

mJ

C

Thermal Impedance

Symbol Parameter Value Unit

(7)

8-DIP

Notes:

7. All items are tested with the standards JESD 51-2 and 51-10 (DIP).

8. Free-standing with no heat-sink, under natural convection.

9. Infinite cooling condition - refer to the SEMI G30-88.

10. Measured on the package top surface.

θJA Junction-to-Ambient Thermal Resistance

θJC Junction-to-Case Thermal Resistance

θJT Junction-to-Top Thermal Resistance

(9)

(10)

(8)

80

20

°C/W

35

FSQ0365/0265/0165/321 — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter

Electrical Characteristics

T A=25C unless otherwise specified.

Symbol Parameter Condition Min. Typ. Max. Unit

SenseFET Section

BV

Drain-Source Breakdown Voltage VCC=0V, ID=100µA 650 V

DSS

I

Zero-Gate-Voltage Drain Current VDS=650V 100 µA

DSS

R

C

DS(ON)

C

ISS

OSS

RSS

t

d(on)

Drain-Source OnState Resistance

(11)

Input Capacitance

Output Capacitance

Reverse Transfer Capacitance

Turn-On Delay

tr Rise Time

t

Turn-Off Delay

d(off)

tf Fall Time

Burst-Mode Section

V

BURH

V

BURL

V

BUR(HYS)

Burst-Mode Voltage T

0.25 0.35 0.45 V

200 mV

Continued on the following page…

FSQ0365

FSQ0265 5.0 6.0

FSQ0165 8.0 10.0

TJ=25C, ID=0.5A

FSQ321

FSQ0365

FSQ0265 550

FSQ0165 250

VGS=0V, VDS=25V, f=1MHz

FSQ321 162

FSQ0365

FSQ0265 38

FSQ0165 25

VGS=0V, VDS=25V, f=1MHz

FSQ321 18

FSQ0365

FSQ0265 17.0

FSQ0165 10.0

VGS=0V, VDS=25V, f=1MHz

FSQ321 3.8

FSQ0365

FSQ0265 20.0

FSQ0165 12.0

VDD=350V, ID=25mA

FSQ321 9.5

FSQ0365

FSQ0265 15

FSQ0165 4

VDD=350V, ID=25mA

FSQ321 19

FSQ0365

FSQ0265 55.0

FSQ0165 30.0

VDD=350V, ID=25mA

FSQ321 33.0

FSQ0365

FSQ0265 25

FSQ0165 10

VDD=350V, ID=25mA

FSQ321 42

=25°C, tPD=200ns

J

(12)

3.5 4.5



14.0 19.0

315

pF

47

pF

9.0

pF

11.2

ns

34

ns

28.2

ns

32

ns

0.45 0.55 0.65 V

Electrical Characteristics (Continued)

T A=25C unless otherwise specified.

Symbol Parameter Conditions Min. Typ. Max. Unit

Control Section

t

Maximum On Time1

ON.MAX1

t

Maximum On Time2 FSQ321 TJ=25°C 6.35 7.06 7.77 µs

ON.MAX2

tB1 Blanking Time1

tB2 Blanking Time2 FSQ321 7.5 8.2 µs

tW Detection Time Window TJ=25°C, V

fS

Switching Frequency Variation

IFB Feedback Source Current VFB=0V 700 900 1100 µA

D

Minimum Duty Cycle VFB=0V 0 %

MIN

V

START

V

STOP

t

S/S1

t

S/S2

UVLO Threshold Voltage After Turn-on

7 8 9 V

Internal Soft-Start Time 1

Internal Soft-Start Time 2 FSQ321

Protection Section

I

Peak Current Limit

LIM

VSD Shutdown Feedback Voltage VCC=15V 5.5 6.0 6.5 V

I

Shutdown Delay Current VFB=5V 4.0 5.0 6.0 µA

DELAY

t

Leading-Edge Blanking Time

LEB

V

Over-Voltage Protection VCC=15V, VFB=2V 5.5 6.0 6.5 V

OVP

t

OVP

Over-Voltage Protection Blanking Time

TSD Thermal Shutdown Temperature

Sync Section

VSH

VSL 0.14 0.20 0.26 V

t

Sync

Sync Threshold Voltage

Sync Delay Time

(13,14)

Total Device Section

IOP

I

START

Operating Supply Current (Control Part Only)

Start Current

ICH Startup Charging Current VCC=0V, V

V

Minimum V

STR

Supply Voltage 26 V

STR

Notes:

11. Pulse test: Pulse-Width=300s, duty=2%.

12. Propagation delay in the control IC.

13. Though guaranteed, it is not 100% tested in production.

14. Includes gate turn-on time.

All but FSQ321

(14)

TJ=25°C 10.5 12.0 13.5 µs

13.2 15.0 16.8 µs

=0V 3.0 µs

sync

-25C < TJ < 85C

±5 ±10 %

11 12 13 V

All but FSQ321

FSQ0365 T

FSQ0265 TJ=25°C, di/dt=200mA/µs 1.06 1.20 1.34

FSQ0165 TJ=25°C, di/dt=175mA/µs 0.8 0.9 1.0

With Free-Running Frequency

=25°C, di/dt=240mA/µs 1.32 1.50 1.68

J

15 ms

10 ms

A

FSQ321 TJ=25°C, di/dt=125mA/µs 0.53 0.60 0.67

(13)

200 ns

2 3 4 µs

(13)

125 140 155 °C

0.55 0.70 0.85 V

300 ns

VCC=15V 1 3 5 mA

V

CC=VSTART

(Before V

- 0.1V Reaches V

CC

=Minimum 40V 0.65 0.85 1.00 mA

STR

START

270 360 450 µA

)

FSQ0365/0265/0165/321 — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter