FairchildFAN302HL5W手机充电器解决方案.docx

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1、Fairchild FAN302HL 5W手机充电器解决方案关键词：电源管理,DC/DC转换器,DC/DC转换器,手机充电器Fairchild公司的FAN302HL是高度集成的PWM控制器,采用mWSaver技术,提供业界最好的待机功耗,低于10mW,远低于能源之星的30mW要求.固定的PWM频率85kHz和跳频技术解决了EMI问题.主要用在手机,无绳,PDA和数码相机以及电动工具等的电池充电器.本文介绍了FAN302HL主要特性,方框图, 反激转换器电路图, 典型应用电路图以及采用FAN302HL的5V / 1A PSR手机电池充电器主要指标,电路图,材料清单和PCB布局图.FAN302HL

2、: mWSaver PWM Controller for Low Standby Power Battery-Charger ApplicationsThis 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 withou

3、t 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 fi*ed peak current limit level, even

4、 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 e*ternal ponen

5、ts and minimized cost, pared to a conventional design or a linear transformer.FAN302HL主要特性:mWSaver Technology Provides Industrys Bestin-Class Standby Power- Achieve Under 10mW; Far Below Energy Stars 5-Star Level (30mW)- Proprietary 500V High-Voltage JFET Startup Reduces Startup Resistor Loss- Low O

6、peration Current in Burst Mode: Ma*imum 350A Constant-Current (CC) Control without Secondary-Feedback Circuitry Fi*ed PWM Frequency at 85kHz with Frequency Hopping to Solve EMI Problem Low Operating Current: 3.5mA Peak-Current-Mode Control in CV Regulation Cycle-by-Cycle Current Limiting VDD Over-Vo

7、ltage Protection (Auto-Restart) VS Over-Voltage Protection (Latch Mode) VDD Under-Voltage Lockout (UVLO) Gate Output Ma*imum Voltage Clamped at 15V Fi*ed Over-Temperature Protection (Latch Mode) Available in an 8-Lead SOIC PackageFAN302HL应用:Battery chargers for cellular phones, cordless phones, PDA,

8、 digital cameras, and power tools.Replaces linear transformers and RCC SMPS.图1. FAN302HL方框图图2. 简化的反激转换器电路图图3. FAN302HL HV起动电路图图4. FAN302HL典型应用电路图FAN302HL 5V / 1A PSR手机电池充电器FAN302HL 5V / 1A PSR Mobile Phone Battery ChargerThis document describes a 5W power supply using a FAN302HL device. This power s

9、upply is targeted for mobile phone battery chargers with a 10mW solution and requiring high efficiency.To get the standby power consumption lower than 10mW at 230VAC, the FAN302HL has functions to enhance the standby power consumption, including proprietary Burst Mode with lower operation current un

10、der light-load conditions and built-in HV startup circuitry in the IC side to reduce startup resistor power loss.Using FAN302HL, a charger can be implemented with the few e*ternal ponents and minimized cost.PSR手机电池充电器主要指标:图5.PSR 5V/1A手机电池充电器图6.PSR 5V/1A手机电池充电器电路图PSR 5V/1A手机电池充电器材料清单:图7.PSR 5V/1A手机电池充电器PCB布局图:上:顶层,下:底层