Fairchild FSQ0565RS, FSQ0565RQ service manual

FSQ0565RS/RQ Green-Mode Fairchild Power Switch (FPS™) for

FSQ0565RS/RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

December 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), 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

FSQ0565RS/RQ Rev. 1.0.3

™

)

™

) Flyback Applications

™)

Applications

™

)

™

)

™

)

Ordering Information

Maximum Output Power

Product

Number

FSQ0565RSWDTU

FSQ0565RQWDTU 3.0A

PKG.

TO-220F-

6L

FSQ0565RSLDTU TO-220F-

FSQ0565RQLDTU 3.0A

6L

(L-Forming)

(5)

Operating

Tem p.

-25 to +85°C

Current

Limit

2.25A

R

DS(ON)

Max.

230VAC±15%

Adapter

(3)

2.2Ω 70W 80W 41W 60W

(2)

Open

Frame

(4)

Adapter

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

Notes:

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

2. 230V

or 100/115VAC with doubler.

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.

5. Eco Status, RoHS

(1)

85-265V

(3)

AC

Open

Frame

(4)

FSCM0565R FSDM0565RE

FSQ0565RS/RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

Replaces

Devices

Application Diagram

AC IN

V

STR

Drain

PWM

Sync

V

FB

V

GND

CC

Figure 1. Typical Flyback Application

FSQ0565RS Rev. 00

V

O

FSQ0565RS/RQ Rev. 1.0.3 2

Block Diagrams

FSQ0565RS/RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

FB

Gate

driver

V

CC

3 16

8V/12V

V

OCP

(1.1V)

FSQ0565RS Rev.00

Drain

2

GND

Sync

V

str

5

AVS

0.35/0.55 V

OSP

LPF

Burst

SoftStart

PWM

TSD

VCC good

3R

R

LPF

V

CCVref

I

delayIFB

4

tON < t

after SS

V

OSP

V

SD

V

CC

V

OVP

OSC

LEB

250ns

SQQ

R

V

ref

good

V

CC

S

Q

QR

AOCP

Figure 2. Internal Block Diagram of FSQ0565RS

FB

Gate

driver

(1.1V)

V

CC

3 16

8V/12V

V

OCP

FSQ0565RQ Rev.00

Drain

2

GND

Sync

V

str

5

AVS

0.35/0.55 V

OSP

LPF

Burst

SoftStart

PWM

TSD

VCC good

3R

R

LPF

V

CCVref

I

delayIFB

4

tON < t

after SS

V

OSP

V

SD

V

OVP

OSC

LEB

250ns

SQQ

R

V

ref

good

V

CC

S

Q

QR

AOCP

Figure 3. Internal Block Diagram of FSQ0565RQ

FSQ0565RS/RQ Rev. 1.0.3 3

Pin Configuration

6. V

STR

5. Sync

4. FB

3. V

CC

2. GND

1. Drain

FSQ0565 Rev.00

Figure 4. 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

Power Supply. This pin is the positive supply input, providing internal operating current for

CC

both startup 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 exter-

str

nal 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

FSQ0565RS/RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

FSQ0565RS/RQ Rev. 1.0.3 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

D

E

AS

P

T

STG

ESD

D

J

A

V

Pin Voltage 500 V

str

Drain Pin Voltage 650 V

Supply Voltage 20 V

Feedback Voltage Range -0.3 13.0 V

Sync Pin Voltage -0.3 13.0 V

Drain Current Pulsed 11 A

Continuous Drain 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

Electrostatic Discharge Capability, Human Body Model 2.0

Electrostatic Discharge Capability, Charged Device Model 2.0

= 25°C, unless otherwise specified.

A

TC = 25°C 2.8

T

= 100°C 1.7

C

(7)

A

190 mJ

kV

FSQ0565RS/RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation

Notes:

6. Repetitive rating: pulse-width limited by maximum junction temperature.

7. L=14mH, starting T

=25°C.

J

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

Notes:

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

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

(9)

(8)

TO-220F-6L

50 °C/W

2.8 °C/W

FSQ0565RS/RQ Rev. 1.0.3 5

FSQ0565RS/RQ — 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

DSS

R

DS(ON)

C

OSS

t

d(on)

t

d(off)

t

CONTROL SECTION

t

ON.MAX

t

W

f

Δf

t

AVS

V

AVS

t

SW

I

FB

D

MIN

V

START

V

STOP

t

S/S

V

OVP

V

OVP

t

OVP

BURST-MODE SECTION

V

BURH

V

BURL

Hysteresis 200 mV

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

Zero-Gate-Voltage Drain Current VDS = 560V 300 µA

Drain-Source On-State Resistance TJ = 25°C, ID = 0.5A 1.76 2.20 Ω

Output Capacitance VGS = 0V, VDS = 25V, f = 1MHz 78 pF

Turn-On Delay Time VDD = 350V, ID = 25mA 22 ns

Rise Time VDD = 350V, ID = 25mA 52 ns

r

Turn-Off Delay Time VDD = 350V, ID = 25mA 95 ns

Fall Time VDD = 350V, ID = 25mA 50 ns

f

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

Blanking Time TJ = 25°C, V

B

Detection Time Window TJ = 25°C, V

Initial Switching Frequency 59.6 66.7 75.8 kHz

S

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 V

= 240VDC, Lm = 360μH

IN

(AVS triggered when V and t

AVS

Sync = 500kHz sine input V

= 1.2V, t

FB

= 5V 13.5 15.0 16.5 µs

sync

= 0V 6.0 µs

sync

4.0 µs

> spec.

< spec.)

ON

= 4.0µs

AVS

13.5 20.5 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 8 9 V

11 12 13 V

Internal Soft-Start Time With free-running frequency 17.5 ms

Over-Voltage Protection (FSQ0565RS) 18 19 20 V

Over-Voltage Protection (FSQ0565RQ)

Threshold Voltage

Blanking

(11)

Time

= 15V, VFB = 2V 7.4 8 9.6 V

V

CC

1.0 1.7 2.4

0.45 0.55 0.65 V

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

(10)

0.25 0.35 0.45 V

µs

Continued on the following page...

FSQ0565RS/RQ Rev. 1.0.3 6

FSQ0565RS/RQ — 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

I

LIMIT

V

SD

I

DELAY

t

LEB

t

OSP

V

OSP

t

OSP_FB

T

SD

Hys Hysteresis 60

Peak Current Limit

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

Output Short Protection

Thermal Shutdown

(11)

FSQ0565RS T

FSQ0565RQ TJ = 25°C, di/dt = 370mA/µs 2.64 3.0 3.36 A

(11)

Threshold Time

Threshold Feedback Voltage

Feedback Blanking Time 2.0 2.5 3.0 µs

Shutdown Temperature 125 140 155

SYNC SECTION

V

t

sync

V

CLAMP

SH1

SL1

SH2

SL2

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

Sync Delay Time

(11, 12)

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

Low Clamp Voltage

TOTAL DEVICE SECTION

I

OP

I

START

I

CH

V

STR

Operating Supply Current VCC = 13V 1 3 5 mA

Start Current

Startup Charging Current VCC = 0V, V

Minimum V

Supply Voltage 26 V

STR

Notes:

10. Propagation delay in the control IC.

11. Guaranteed by design; not tested in production.

12. Includes gate turn-on time.

= 25°C, di/dt = 370mA/µs 2.00 2.25 2.50 A

J

250 ns

TJ = 25°C OSP triggered when t V

> V

FB

t

OSP_FB

and lasts longer than

OSP

ON

< t

OSP

,

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

= 10V

CC

= 800µA,

= 50µA

reaches V

STR

START

= minimum 50V 0.65 0.85 1.00 mA

0.0 0.4 0.8 V

350 450 550 µA

)

I

SYNC_MAX

I

SYNC_MIN

V

CC

(before V

°C

V

FSQ0565RS/RQ Rev. 1.0.3 7