April 2007

© 2007 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSQ211 Rev. 1.0.0

FSQ211

Green Mode Fairchild Power Switch (FPS

TM)

Features

Internal Avalanche-Rugged SenseFET

Precision Fixed Operating Frequency (67KHz)

Burst-Mode Operation

Internal Start-up Circuit

Pulse-by-Pulse Current Limiting

Overload Protection (OLP)

Internal Thermal Shutdown Function (TSD)

Auto-Restart Mode

Under-Voltage Lockout (UVLO) with Hysteresis

Built-in Soft-Start

Secondary-Side Regulation

Applications

Charger & Adapter for Mobile Phone, PDA, & MP3

Auxiliary Power for White Goods, PC, C-TV, &

Monitor

Related Application Notes

AN-4137 Design Guidelines for Off-line Flyback

Converters using FPS™

AN-4141 Troubleshooting and Design Tips for

Fairchild Power Switch (FPS™) Flyback Applications

AN-4147 Design Guidelines for RCD Snubber of

Flyback

AN-4134Design Guidelines for Off-line Forward

Converters using FPS™

AN-4138Design Considerations for Battery Charger

Using Green Mode Fairchild Power Switch (FPS™)

Description

The FSQ211 consists of an integrated Pulse Width

Modulator (PWM) and SenseFET, specifically designed

for high-performance, off-line Switch Mode Power

Supplies (SMPS) with minimal external components.

This device is an integrated high-voltage power

switching regulator that combines a VDMOS SenseFET

with a voltage mode PWM control block. The integrated

PWM controller features include a fixed oscillator, Under

Voltage Lockout (UVLO) protection, Leading Edge

Blanking (LEB), an optimized gate turn-on/turn-off

driver, Thermal Shutdown (TSD) protection, and

temperature compensated precision-current sources for

loop compensation and fault protection circuitry.

When compared to a discrete MOSFET and controller or

RCC switching converter solution, the FSQ211 device

reduces total component count and design size and

weight, while increasing efficiency, productivity, and

system reliability. This device provides a basic platform

well suited for cost-effective flyback converters.

Ordering Information

Part Number

Package

Top Mark

BVDSS

fOSC

RDS(ON)

FSQ211

8DIP

Q211

650V

67KHz

18Ω

FSQ211L

8LSOP

Q211L

650V

67KHz

18Ω

FPS

TM is a trademark of Fairchild Semiconductor Corporation