FSCQ datasheet(2/37 Pages) ONSEMI

2 / 37 page

January 2014

www.fairchildsemi.com

FSQ-Series

• Rev. 1.1.3

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

BVDSS (V)

RDSON 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

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