Data Sheet

March 2011
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSQ100 Rev. 1.0.2
FSQ100 — Green Mode Fairchild Power Switch (FPS
TM
)
FSQ100
Green Mode Fairchild Power Switch (FPS™)
Features
 Internal Avalanche-Rugged SenseFET
 Precision Fixed Operating Frequency: 67KHz
 Burst-Mode Operation
 Internal Startup 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 BV
DSS
f
OSC
R
DS(ON)
FSQ100 8-DIP Q100 650V 67KHz
16Ω
FPS™ is a trademark of Fairchild Semiconductor Corporation.