Data Sheet

January 2014
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSQ-Series • Rev. 1.1.3
FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)
FSCQ-Series:
FSCQ0565RT / FSCQ0765RT / FSCQ0965RT / FSCQ1265RT / FSCQ1565RT
Green Mode Fairchild Power Switch (FPS™)
Features
 Optimized for Quasi-Resonant Converter (QRC)
 Advanced Burst-Mode Operation for under 1 W
Standby Power Consumption
 Pulse-by-Pulse Current Limit
 Overload Protection (OLP) – Auto Restart
 Over-Voltage Protection (OVP) – Auto Restart
 Abnormal Over-Current Protection (AOCP) – Latch
 Internal Thermal Shutdown (TSD) – Latch
 Under-Voltage Lockout (UVLO) with Hysteresis
 Low Startup Current (Typical: 25 μA)
 Internal High Voltage SenseFET
 Built-in Soft-Start (20 ms)
 Extended Quasi-Resonant Switching
Applications
 CTV
 Audio Amplifier
Description
A Quasi-Resonant Converter (QRC) typically shows
lower EMI and higher power conversion efficiency
compared to a conventional hard-switched converter
with a fixed switching frequency. Therefore, a QRC is
well suited for noise-sensitive applications, such as
color TV and audio. Each product in the FSCQ series
contains an integrated Pulse Width Modulation (PWM)
controller and a SenseFET. This series is specifically
designed for quasi-resonant off-line Switch Mode Power
Supplies (SMPS) with minimal external components.
The PWM controller includes an integrated fixed
frequency oscillator, under-voltage lockout, leading-
edge blanking (LEB), optimized gate driver, internal soft-
start, temperature-compensated precise current sources
for loop compensation, and self-protection circuitry.
Compared with a discrete MOSFET and PWM controller
solution, the FSCQ series can reduce total cost,
component count, size, and weight; while increasing
efficiency, productivity, and system reliability. These
devices provide a basic platform for cost-effective
designs of quasi-resonant switching flyback converters.
Related Resources
 AN-4146 — Design Guidelines for Quasi-Resonant Converters Using FSCQ-Series Fairchild Power Switch
 AN-4140 — Transformer Design Consideration for Offline Flyback Converters Using Fairchild Power Switch
Ordering Information
Part Number
Package
Marking Code
BV
DSS
(V)
R
DSON
Max. (Ω)
FSCQ0565RTYDTU
TO-220F-5L (Forming)
CQ0565RT
650
2.2
FSCQ0765RTYDTU
TO-220F-5L (Forming)
CQ0765RT
650
1.6
FSCQ0965RTYDTU
TO-220F-5L (Forming)
CQ0965RT
650
1.2
FSCQ1265RTYDTU
TO-220F-5L (Forming)
CQ1265RT
650
0.9
FSCQ1565RTYDTU
TO-220F-5L (Forming)
CQ1565RT
650
0.7