FSQ321L

PWM 控制器，Fairchild Semiconductor### 离线和隔离直流-直流控制器，Fairchild Semiconductor回扫控制器、线路电平控制 LLC 控制器和初级侧调节控制器显著节能，以满足开关模式电源 SMPS 设计的需要。 所有控制器随附集成软启动和过压、开口反馈、过载、输出短路、过电流、电压中断和欠压闭锁功能。

Description

A Valley Switching Converter 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 valley switching operation 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.

Features

■ Optimized for Valley Switching Converter VSC

■ Low EMI through Variable Frequency Control and Inherent Frequency Modulation

■ 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

■ Pulse-by-Pulse Current Limit

■ Protection Functions: Overload Protection OLP, Over-Voltage Protection OVP, Abnormal Over Current Protection AOCP, Internal Thermal Shutdown TSD

■ Under-Voltage Lockout UVLO with Hysteresis

■ Internal Startup Circuit

■ Internal High-Voltage SenseFET: 650V

■ Built-in Soft-Start: 15ms

Applications

■ Power Supplies for DVP Player, DVD Recorder, Set-Top Box

■ Adapter

■ Auxiliary Power Supply for PC, LCD TV, and PDP TV