April 2007
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA
Green Mode Fairchild Power Switch (FPS™)
Features
Description
Internal Avalanche Rugged 700V SenseFET
Consumes only 0.8W at 230 VAC & 0.5W Load with
Burst-Mode Operation
Precision Fixed Operating Frequency, 100kHz
Internal Start-up Circuit and Built-in Soft-Start
The FSQ0170RNA, FSQ0270RNA, FSQ0370RNA
consists of an integrated current mode Pulse Width
Modulator (PWM) and an avalanche-rugged 700V Sense
FET. It is specifically designed for high-performance off-
line Switch Mode Power Supplies (SMPS) with minimal
external components. The integrated PWM controller
features include: a fixed-frequency generating 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.
Pulse-by-Pulse Current Limiting and Auto-Restart
Mode
Over-Voltage Protection (OVP), Overload Protection
(OLP), Internal Thermal Shutdown Function (TSD)
Under-Voltage Lockout (UVLO)
Low Operating Current (3mA)
Adjustable Peak Current Limit
Compared to a discrete MOSFET and controller or RCC
switching converter solution, the FSQ0170RNA,
FSQ0270RNA, FSQ0370RNA reduces total component
count, design size, and weight while increasing
efficiency, productivity, and system reliability. These
devices provide a basic platform that is well suited for the
design of cost-effective flyback converters, as in PC
auxiliary power supplies.
Applications
Auxiliary Power Supply for PC and Server
SMPS for VCR, SVR, STB, DVD & DVCD Player,
Printer, Facsimile & Scanner
Adapter for Camcorder
Related Application Notes
AN-4134: Design Guidelines for Off-line Forward
8-DIP
Converters Using Fairchild Power Switch (FPS™)
AN-4137: Design Guidelines for Off-line Flyback
Converters Using Fairchild Power Switch (FPS™)
AN-4141: Troubleshooting and Design Tips for
Fairchild Power Switch (FPS™) Flyback Applications
AN-4147: Design Guidelines for RCD Snubber of
Flyback
AN-4148: Audible Noise Reduction Techniques for
FPS™ Applications
Ordering Information
Product Number
FSQ0170RNA
FSQ0270RNA
FSQ0370RNA
Package
8DIP
Marking Code
Q0170R
BV
f
R
DS(ON) (MAX.)
DSS
OSC
700V
100kHz
100kHz
100kHz
11Ω
8DIP
Q0270R
700V
700V
7.2Ω
8DIP
Q0370R
4.75Ω
FPSTM is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.2