Document
FSCQ-Series Green Mode Fairchild Power Switch (FPS™)
February 2006
FSCQ-Series FSCQ0565RT/FSCQ0765RT/FSCQ0965RT/FSCQ1265RT/ FSCQ1465RT/FSCQ1565RT/FSCQ1565RP Green Mode Fairchild Power Switch (FPS™)
Features
■ Optimized for Quasi-Resonant Converter (QRC) www.DataSheet4U.com ■ Advanced Burst-Mode Operation for under 1W
Description
A Quasi-Resonant Converter (QRC) typically shows lower EMI and higher power conversion efficiency compared to 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, and is specifically designed for quasiresonant 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 a 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 simultaneously increasing efficiency, productivity, and system reliability. These devices provide a basic platform that is well suited for cost-effective designs of quasi-resonant switching flyback converters.
Standby Power Consumption
■ Pulse-by-Pulse Current Limit ■ Over Load Protection (OLP) – Auto Restart ■ Over Voltage Protection (OVP) – Auto Restart ■ Abnormal Over Current Protection (AOCP) – Latch ■ Internal Thermal Shutdown (TSD) – Latch ■ Under Voltage Lock Out (UVLO) with Hysteresis ■ Low Startup Current (typical: 25µA) ■ Internal High Voltage SenseFET ■ Built-in Soft Start (20ms) ■ Extended Quasi-Resonant Switching
Applications
■ CTV ■ Audio Amplifier
Related Application Notes
■ AN4146: Design Guidelines for Quasi-Resonant
Converters Using FSCQ-Series Fairchild Power Switch. ■ AN4140: Transformer Design Consideration for Off-Line Flyback Converters Using Fairchild Power Switch.
Ordering Information
Product Number
FSCQ0565RTYDTU FSCQ0765RTYDTU FSCQ0965RTYDTU FSCQ1265RTYDTU FSCQ1465RTYDTU FSCQ1565RTYDTU FSCQ1565RPVDTU
YDTU: Forming Type VDTU: Forming Type
Package
TO-220F-5L (Forming) TO-220F-5L (Forming) TO-220F-5L (Forming) TO-220F-5L (Forming) TO-220F-5L( Forming) TO-220F-5L (Forming) TO-3PF-7L (Forming)
Marking Code
CQ0565RT CQ0765RT CQ0965RT CQ1265RT CQ1465RT CQ1565RT CQ1565RP
BVdss
650V 650V 650V 650V 650V 650V 650V
Rds(ON) Max.
2.2Ω 1.6Ω 1.2Ω 0.9Ω 0.8Ω 0.7Ω 0.7Ω
©2006 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
FSCQ-Series Rev. 1.1.2
FSCQ-Series Green Mode Fairchild Power Switch (FPS™)
Typical Circuit
VO
AC IN
Drain FSCQ-Series PWM Sync GND VFB VCC
www.DataSheet4U.com
Figure 1. Typical Flyback Application Table 1. Maximum Output Power Output Power Table3 230 VAC ±15%2 Produ.