Fairchild公司的FAN302HL是高度集成的PWM控制器,采用mWSaver™技術,提供業界最好的待機功耗,低于10mW,遠低于能源之星的30mW要求.固定的PWM頻率85kHz和跳頻技術解決了EMI問題.主要用在手機,無繩電話,PDA和數碼相機以及電動工具等的電池充電器.本文介紹了FAN302HL主要特性,方框圖, 反激轉換器電路圖, 典型應用電路圖以及采用FAN302HL的5V / 1A PSR手機電池充電器主要指標,電路圖,材料清單和PCB布局圖.
FAN302HL: mWSaver™ 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:
? mWSaver™ Technology Provides Industry’s Bestin-Class Standby Power
- Achieve Under 10mW; Far Below Energy Star’s 5-Star Level (<30mW)
- Proprietary 500V High-Voltage JFET Startup Reduces Startup Resistor Loss
- Low Operation Current in Burst Mode: Maximum 350μA
? Constant-Current (CC) Control without Secondary-Feedback Circuitry
? Fixed 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-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應用:
Battery chargers for cellular phones, cordless phones, PDA, digital cameras, and power tools. Replaces linear transformers and RCC SMPS.
圖1. FAN302HL方框圖
圖2. 簡化的反激轉換器電路圖
圖3. FAN302HL HV起動電路圖
圖4. FAN302HL典型應用電路圖
FAN302HL 5V / 1A PSR手機電池充電器
FAN302HL 5V / 1A PSR Mobile Phone Battery Charger
This document describes a 5W power supply using a FAN302HL device. This power supply 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 under 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 external components and minimized cost.
PSR手機電池充電器主要指標:
圖5.PSR 5V/1A手機電池充電器
圖6.PSR 5V/1A手機電池充電器電路圖
PSR 5V/1A手機電池充電器材料清單:
圖7.PSR 5V/1A手機電池充電器PCB布局圖:上:頂層,下:底層
詳情請見:
http://www.fairchildsemi.com/ds/FA/FAN302HL.pdf
和
http://www.fairchildsemi.com/products/evaluationboards/FEBFAN302HL_CH442v1.pdf?user-guide=%3CIMG+alt%3D%22%22+src%3D%22pdf_icon.gif%22+align%3DabsMiddle+border%3D0%3E+User+Guide
