May 2007

© 2007 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSQ100 Rev. 1.0.1

FSQ100

Green Mode Fairchild Power Switch (FPS

Features

Internal Avalanche-Rugged SenseFET

Precision Fixed Operating Frequency (67KHz)

Burst-Mode Operation

Internal Start-up Circuit

Pulse-by-Pulse Current Limiting

Over-Voltage Protection (OVP)

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-4134 Design Guidelines for Off-line Forward

Converters using FPS™

AN-4138 Design Considerations for Battery Charger

Using Green Mode Fairchild Power Switch (FPS™)

Description

The FSQ100 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 solution, the FSQ100 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

Product Number

Package

Marking Code

FSQ100

8-DIP

Q100

650V

67KHz

16Ω

FPS