摘要：  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.

关键字：  电池，  电源，  手机，  转换器

 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.

 Using FAN302HL， a charger can be implemented with few external components and minimized cost， compared to a conventional design or a linear transformer.

 FAN302HL主要特性:

Ultra-Low Standby Power: Under 10mW at 230VAC

Constant-Current (CC) Control without Secondary- Feedback Circuitry

Fixed PWM Frequency at 85kHz with Frequency Hopping to Solve EMI Problem

High-Voltage Startup

Low Operating Current: 3.5mA

Peak-Current-Mode Control in CV Regulation

Cycle-by-Cycle Current Limiting

VDD Over-Voltage Protection (Auto-Restart)

VS Over-Voltage Protection (Latch Mode)

VDD Under-Voltage Lockout (UVLO)

Gate Output Maximum Voltage Clamped at 15V

Fixed Over-Temperature Protection (Latch Mode)

Available in an 8-Lead SOIC Package

FAN302HL应用:

Battery chargers for cellular phones， cordless phones， PDA， digital cameras， and power tools. Replaces linear transformers and RCC SMPS.

图1.FAN302HL功能方框图

图2.FAN302HL简化反激转换器电路图

图3.FAN302HL高压(HV)起动电路图

图4.FAN302HL典型应用电路

图5.FAN302HL典型应用电路图

图6.FAN302HL变压器结构图
变压器绕组指标: