Fairchild FAN302HL低待机功耗PWM电源控制方案

Fairchild公司的FAN302HL是低待机功耗电池充电器用的PWM电源控制器,采用恒流模式控制,在230VAC时的带机功耗低于10mW,固定PWM频率85kHz和跳频,以降低EMI,工作电流3.5A,栅极输出最大电压箝位在15V,具有高压起动功能,主要用在手机,无绳电话,PDA和数码相机等电池充电器.本文介绍了FAN302HL主要特性, 功能方框图, 高压(HV)起动电路图, 反激转换器电路图和典型应用电路图以及变压器结构图和绕组指标.

FAN302HL PWM Controller for Low Standby Power Battery-Charger Applications

This highly integrated PWM controller, FAN302HL, provides several features to enhance the performance of general flyback converters. The constant-current control, proprietary topology enables simplified circuit designs without secondary feedback circuitry for batterycharger applications.

A proprietary Burst-Mode function with low operation current minimizes standby power consumption.

The FAN302HL controller also provides several protections. Cycle-by-cycle current limiting ensures the fixed peak current limit level, even if a short circuit occurs. The gate output is clamped at 15V to protect the power MOS from high gate-source voltage conditions. If either VS OVP or internal OTP is triggered, the circuit enters Latch Mode until AC power is removed.
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