Description

A Quasi-Resonant Converter (QRC) generally shows

lower EMI and higher power conversion efficiency than a

conventional hard-switched converter with a fixed

switching frequency. The FSQ-series is an integrated

Pulse-Width Modulation (PWM) controller and

SenseFET specifically designed for quasi-resonant

operation and Alternating Valley Switching (AVS). The

PWM controller includes an integrated fixed-frequency

oscillator, Under-Voltage Lockout (UVLO), 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 FSQ-series can reduce total cost,

component count, size, and weight; while simultaneously

increasing efficiency, productivity, and system reliability.

This device provides a basic platform for cost-effective

designs of quasi-resonant switching flyback converters.

Features

! Optimized for Quasi-Resonant Converters (QRC)

! Low EMI through Variable Frequency Control and AVS

(Alternating Valley Switching)

! High-Efficiency through Minimum Voltage Switching

! Narrow Frequency Variation Range over Wide Load

and Input Voltage Variation

! Advanced Burst-Mode Operation for Low Standby

Power Consumption

! Simple Scheme for Sync Voltage Detection

! Pulse-by-Pulse Current Limit

! Various Protection Functions: Overload Protection

(OLP), Over-Voltage Protection (OVP), Internal

Thermal Shutdown (TSD) with Hysteresis,

Output Short Protection (OSP)

! Under-Voltage Lockout (UVLO) with Hysteresis

! Internal Startup Circuit

! Internal High-Voltage Sense FET (650V)

! Built-in Soft-Start (17.5ms)

Applications

! Power Supply for LCD TV and Monitor, VCR, SVR,

STB, and DVD & DVD Recorder

! Adapter

FSQ0565RQ属于集成电路（IC） > AC DC 转换器，离线开关。安森美半导体公司制造生产的FSQ0565RQAC DC 转换器，离线开关该系列是元器件级控制产品，用于构建将交流市电转换为直流电（通常电压大幅降低）的设备。集成和未集成系统主要开关元件的器件均包括在内。由于高输入输出电压比，以及此类系统中通常需要隔离，这些器件通常与外部变压器配合使用。尽管通常使用定制变压器来实现此用途，但也有许多专门用于此用途的库存产品，请参见“开关转换器，SMPS 变压器”标题。