Fairchild FSQ0465RU service manual

FSQ0465RU
Green-Mode Fairchild Power Switch (FPS™) for

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

May 2009

Quasi-Resonant Operation -

Features

! Optimized for Quasi-Resonant Converters (QRC)
! Low EMI through Variable Frequency Control and AVS

(Alternating Valley Switching)

! 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

! Simple Scheme for Sync-Voltage Detection
! Pulse-by-Pulse Current Limit
! Various Protection Functions: Overload Protection

(OLP), Over-Voltage Protection (OVP), Abnormal
Over-Current Protection (AOCP), Internal Thermal
Shutdown (TSD) with Hysteresis, Output Short
Protection (OSP)

! Under-Voltage Lockout (UVLO) with Hysteresis
! Internal Startup Circuit
! Internal High-Voltage Sense FET (650V)
! Built-in Soft-Start (17.5ms)

Applications

! Power Supply for LCD TV and Monitor, VCR, SVR,

STB, and DVD & DVD Recorder

! Adapter

Low EMI and High Efficiency

Description

A Quasi-Resonant Converter (QRC) 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 quasi-resonant
operation and Alternating Valley Switching (AVS). The
PWM controller includes an integrated fixed-frequency
oscillator, Under-Voltage Lockout (UVLO), Leading­Edge Blanking (LEB), optimized gate driver, internal soft­start, temperature-compensated precise current sources
for a loop compensation, and self-protection circuitry.
Compared with a discrete MOSFET and PWM controller
solution, the FSQ-series can reduce 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 quasi-resonant switching flyback converters.

Related Resources

Visit: http://www.fairchildsemi.com/apnotes/ for:

! AN-4134: Design Guidelines for Offline Forward

Converters Using Fairchild Power Switch (FPS

! AN-4137: Design Guidelines for Offline Flyback

Converters Using Fairchild Power Switch (FPS

! AN-4140: Transformer Design Consideration for

Offline Flyback Converters Using Fairchild Power
Switch (FPS

! AN-4141: Troubleshooting and Design Tips for

Fairchild Power Switch (FPS

! AN-4145: Electromagnetic Compatibility for Power

Converters

! AN-4147: Design Guidelines for RCD Snubber of

Flyback Converters

! AN-4148: Audible Noise Reduction Techniques for

Fairchild Power Switch (FPS

! AN-4150: Design Guidelines for Flyback Converters

Using FSQ-Series Fairchild Power Switch (FPS

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com

FSQ0465RU Rev. 1.0.0

™

)

™

) Flyback Applications

™)

Applications

™

)

™

)

™

)

Ordering Information

Maximum Output Power

(3)

(2)

Open

Frame

(4)

Adapter

Product

Number

PKG.

Operating

(5)

Tem p.

Current

Limit

R

DS(ON)

Max.

230VAC±15%

Adapter

TO-

FSQ0465RUWDTU

For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html

220F-6L

-25 to +85°C 1.8A 4.0Ω 50W 60W 28W 40W

Notes:

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

2. 230VAC or 100/115VAC with doubler.

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.

5. Eco Status, RoHS.

(1)

85-265V

(3)

AC

Open

Frame

Replaces

(4)

FSCM0465R
FSDM0465RE

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

Devices

.

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com

FSQ0465RU Rev. 1.0.0 2

Application Diagram

AC

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

V

O

IN

V

STR

Drain

PWM

Sync

V

FB

V

CC

GND

FSQ0465 Rev. 00

Internal Block Diagram

0.35/0.55
V

Burst

OSP

LPF

FB

V

CCVref

I

delayIFB

4

tON < t

after SS

V

OSP

V

SD

V

CC

V

OVP

Figure 1. Typical Flyback Application

Sync

5

AVS

Soft­Start

PWM

TSD

VCC good

3R

R

LPF

OSC

LEB

250ns

SQQ

R

V

str

V

CC

Drain

3 16

V

V

ref

V

good

CC

S

Q

QR

AOCP

Gate

driver

CC

8V/12V

2

V

OCP

(1.1V)

GND

FSQ0465 Rev.00

Figure 2. Internal Block Diagram

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com

FSQ0465RU Rev. 1.0.0 3

Pin Configuration

6. V

STR

5. Sync

4. FB

3. V

CC

2. GND

1. Drain

FSQ0465 Rev.00

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin # Name Description

1DrainSenseFET Drain. High-voltage power SenseFET drain connection.

2GNDGround. This pin is the control ground and the SenseFET source.

3V

4FB

5 Sync

6V

CC

str

Power Supply. This pin is the positive supply input, providing internal operating current for
both start-up and steady-state operation.

Feedback. This pin is internally connected to the inverting input of the PWM comparator. The
collector of an opto-coupler is typically tied to this pin. For stable operation, a capacitor should
be placed between this pin and GND. If the voltage of this pin reaches 6V, the overload pro­tection triggers, which shuts down the FPS.

Sync

. This pin is internally connected to the sync-detect comparator for quasi-resonant switch-

ing. In normal quasi-resonant operation, the threshold of the sync comparator is 1.2V/1.0V.

Startup. This pin is connected directly, or through a resistor, to the high-voltage DC link. At
startup, the internal high-voltage current source supplies internal bias and charges the exter­nal capacitor connected to the VCC pin. Once VCC reaches 12V, the internal current source is
disabled. It is not recommended to connect V

and Drain together.

str

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com

FSQ0465RU Rev. 1.0.0 4

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

str

V

DS

V

CC

V

FB

V

Sync

I

DM

I

DSW

E

AS

P

D

T

J

T

A

T

STG

ESD Electrostatic Discharge

V

Pin Voltage 500 V

str

Drain Pin Voltage 650 V

Supply Voltage 21 V

Feedback Voltage Range -0.3 13.0 V

Sync Pin Voltage -0.3 13.0 V

Drain Current Pulsed 8.4 A

Continuous Drain Switching
Current

(6)

Single Pulsed Avalanche Energy

Total Power Dissipation (TC=25°C) 45 W

Operating Junction Temperature Internally limited °C

Operating Ambient Temperature -25 +85 °C

Storage Temperature -55 +150 °C

= 25°C, unless otherwise specified.

A

TC = 25°C 3.8 A

(7)

Human Body Model,
JESD22-A114

Charged Device Model,
JESD22-C101

100 mJ

2.0 kV

2.0 kV

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

Notes:

6. Repetitive peak switching current when inductor load is assumed : limited by maximum duty and maximum junction
temperature.

I

DS

D

MAX

f

SW

7. L=45mH, I

=2.1A, starting TJ=25°C.

AS

Thermal Impedance

TA = 25°C unless otherwise specified.

Symbol Parameter Package Value Unit

θ

JA

θ

JC

Junction-to-Ambient Thermal Resistance

Junction-to-Case Thermal Resistance

(8)

(9)

Notes:

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

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

TO-220F-6L

50

2.8

°

C/W

°

C/W

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com

FSQ0465RU Rev. 1.0.0 5

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

Electrical Characteristics

TA = 25°C unless otherwise specified.

Symbol Parameter Condition Min. Typ. Max. Unit

SenseFET Section

BV

DSS

I

DSS1

I

DSS2

R

DS(ON)

C

OSS

t

d(on)

t

r

t

d(off)

t

f

Control Section

t

ON.MAX

t

B

t

W

f

S

Δf

t

AVS

V

AVS

t

SW

I

FB

D

MIN

V

START

V

STOP

t

S/S

V

OVP

Burst-ModeSection

V

BURH

V

BURL

Hysteresis 200 mV

Drain Source Breakdown Voltage VCC=0V, ID=250µA 650 V

Zero-Gate-Voltage Drain Current 1 VDS=650V, VGS=0V, TC=25oC250µA

Zero-Gate-Voltage Drain Current 2 VDS=520V, VGS=0V, TC=125oC250µA

Drain-Source On-State Resistance TJ=25°C, ID=0.5A 3.5 4.0 Ω

Output Capacitance VGS=0V, VDS=25V, f=1MHz 45 pF

Turn-On Delay Time VDD=325V, ID=3.5A 12 ns

Rise Time VDD=325V, ID=3.5A 22 ns

Turn-Off Delay Time VDD=325V, ID=3.5A 20 ns

Fall Time VDD=325V, ID=3.5A 19 ns

Maximum On Time TJ=25°C 8.8 10.0 11.2 µs

Blanking Time TJ=25°C, V

Detection Time Window TJ=25°C, V

=5V 13.5 15.0 16.5 µs

sync

=0V 6.0 µs

sync

Initial Switching Frequency 59.6 66.7 75.8 kHz

Switching Frequency Variation

S

AVS Triggering
Threshold

(11)

Switching Time Variance by AVS

(11)

On Time

Feedback
Voltage

(11)

-25°C < TJ < 85°C ±5 ±10 %

at VIN=240VDC, Lm=360μH
(AVS Triggered when V
Spec. and t

AVS

< Spec.)

AVS

Sync=500kHz Sine Input
VFB=1.2V, tON=4.0µs

>

13.5 20.5 µs

4.0 µs

1.2 V

Feedback Source Current VFB=0V 700 900 1100 µA

Minimum Duty Cycle VFB=0V 0 %

UVLO Threshold Voltage

After Turn-On 7.5 8.0 8.5 V

11 12 13 V

Internal Soft-Start Time With Free-Running Frequency 17.5 ms

Over-Voltage Protection 18 19 20 V

0.45 0.55 0.65 V

Burst-Mode Voltages TJ=25°C, tPD=200ns

(10)

0.25 0.35 0.45 V

Continued on the following page...

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com

FSQ0465RU Rev. 1.0.0 6

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

Electrical Characteristics (Continued)

T

= 25°C unless otherwise specified.

A

Symbol Parameter Condition Min. Typ. Max. Unit

Protection Section

I

LIMIT

V

SD

I

DELAY

t

LEB

t

OSP

V

OSP

t

OSP_FB

T

SD

Hys Hysteresis +60

Sync Section

V

SH1

V

SL1

t

sync

V

SH2

V

SL2

V

CLAMP

Total Device Section

I

OP

I

START

I

CH

V

STR

Notes:

10. Propagation delay in the control IC.

11. Guaranteed by design; not tested in production.

12. Includes gate turn-on time.

Peak Current Limit TJ=25°C, di/dt=480mA/µs 1.6 1.8 2.0 A

Shutdown Feedback Voltage VCC=15V 5.5 6.0 6.5 V

Shutdown Delay Current VFB=5V 4 5 6 µA

Leading-Edge Blanking Time

Threshold Time

Output Short
Protection

Threshold Feedback

(11)

Voltage

Feedback Blanking Time 2.0 2.5 3.0 µs

Thermal
Shutdown

Shutdown Temperature +125 +140 +155

(11)

Sync Threshold Voltage 1 VCC = 15V, VFB=2V

Sync Delay Time

(11)(12)

Sync Threshold Voltage 2 VCC = 15V, VFB=2V

Low Clamp Voltage

(11)

TJ= 25°C
OSP Triggered When t
V

> V

FB

than t

I

SYNC_MAX

I

SYNC_MIN

and Lasts Longer

OSP

OSP_FB

=800µA,

=50µA

ON

< t

OSP

250 ns

1.2 1.4 µs

,

1.8 2.0 V

1.0 1.2 1.4

0.8 1.0 1.2

230 ns

4.3 4.7 5.1

4.0 4.4 4.8

0.0 0.4 0.8 V

°C

V

V

Operating Supply Current VCC=13V 1 3 5 mA

=10V

V

Start Current

Startup Charging Current VCC=0V, V

Minimum V

Supply Voltage 26 V

STR

CC

(Before V

Reaches V

CC

=Minimum 50V 0.65 0.85 1.00 mA

STR

START

350 450 550 µA

)

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com

FSQ0465RU Rev. 1.0.0 7