Document
FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)
January 2014
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, leadingedge blanking (LEB), optimized gate driver, internal softstart, 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
FSCQ0565RTYDTU FSCQ0765RTYDTU FSCQ0965RTYDTU FSCQ1265RTYDTU FSCQ1565RTYDTU
TO-220F-5L (Forming) TO-220F-5L (Forming) TO-220F-5L (Forming) TO-220F-5L (Forming) TO-220F-5L (Forming)
© 2006 Fairchild Semiconductor Corporation FSQ-Series • Rev. 1.1.3
Marking Code CQ0565RT CQ0765RT CQ0965RT CQ1265RT CQ1565RT
BVDSS (V) 650 650 650 650 650
RDSON Max. (Ω) 2.2 1.6 1.2 0.9 0.7
www.fairchildsemi.com
FSCQ-Series — Green Mode Fairchild Power Switch (FPS™)
Typical Circuit
AC IN
Sync
FSCQ-Series
PWM
VFB
VCC
Drain GND
VO
Figure 1. Typical Flyback Application
Table 1. Maximum Output Power(1)
Product
230 VAC ±15%(2) Open Frame(3)
FSCQ0565RT FSCQ0765RT FSCQ0965RT FSCQ1265RT FSCQ1565RT
70 W 100 W 130 W 170 W 210 W
Notes:
1. The junction temperature can limit the maximum output power. 2. 230 VAC or 100/115 VAC with doubler. 3. Maximum practical conti.