Fairchild公司的FAN104W是高頻初級調整的PWM控制器,能提高低功率反激轉換器的性能.待機功耗小于30mW,滿足能量之星五星標準,突發模式工作電流600uA,具有輸出短路保護,輸出過壓保護(VSOVP),VDD過壓保護和超溫保護等功能,主要用在智能手機,PAD,PDA和數碼相機電池充電器等.本文介紹了FAN104W主要特性,方框圖,典型應用電路以及10W平板電腦和智能手機充電器參考設計主要特性,電路圖,變壓器電路和PCB布局圖.

This highly integrated PWM controller, FAN104W, provides several features to enhance the performance of low-power flyback converters. The proprietary topology of FAN104W enables simplified circuit design for battery charger applications. The result is a lowercost,smaller, and lighter charger compared to a conventional design or a linear transformer.To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to linearly decrease PWM frequency under light-load conditions. Green Mode assists the power supply in meeting power conservation requirements. By using FAN104W, a charger can be implemented with few external components and minimized cost.

FAN104W主要特性:

? Achieves <30 mW; Energy Star’s 5-Star Level

? Proprietary 500 V High-Voltage JFET Startup Reduces Startup Resistor Loss

? Low Operation Current in Burst Mode: 600 μA

? Constant-Voltage (CV) and Constant-Current (CC)

Control without Secondary-Feedback Circuitry

? Green Mode: PWM Frequency Linearly-Decreasing

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

? Boundary-Conduction-Mode (BCM) Operation at Lower AC Input Voltage

? Cable Compensation in CV Mode

? Cycle-by-Cycle Current Limiting

? Gate Output Maximum Voltage Clamped at 14 V

? VDD Under-Voltage Lockout (UVLO) Available

? Built-in Protections:

- Output Short-Circuit Protection

- Output Over-Voltage-Protection (VSOVP) with Latch Mode

- VDD Over-Voltage-Protection (VDD OVP)

- CS Pin Single-Fault Protection

- VS Pin single-Fault Protection

- Over-Temperature-Protection (OTP) with Latch Mode

? SOIC Package

FAN104W應用:

? Battery chargers for smart phones, Pad, PDA,digital cameras.

? Best choice to replace linear transformer and RCC SMPS

圖1.FAN104W方框圖

圖2.FAN104W典型應用電路圖

10W平板電腦和智能手機充電器參考設計


This reference design supports inclusion of the FAN104W in the design of a 10W charger with BCM operation and Primary-Side Regulation (PSR) technology. It should be used in conjunction with the FAN104W datasheet as well as Fairchild’s application notes and technical support team.

10W充電器參考設計主要特性:

 Low Standby-Power Consumption: < 50mW at 264VAC

 Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry

 PWM Frequency at 85kHz with Frequency Hopping to Reduce EMI

 Frequency-Reduction Technology for BCM Operation

 Cable-Voltage-Drop Compensation in CV Mode

 High-Voltage Startup

 Low Burst-Mode Operating Current: 600A(Typical) and Normally-Operating Current: 3.5mA (Typical)

 Output Over-Voltage Protection (OVP), VDD Over-Voltage Protection (OVP),VDD Under-Voltage Lockout (UVLO), Over-Temperature Protection (OTP),CS-Pin- Short Protection, VS-Pin Single-Fault Protection

 SOIC-8 Package

圖3.10W充電器參考設計電路圖

圖4.10W充電器參考設計變壓器電路圖

圖5.10W充電器參考設計外形圖

圖6.10W充電器參考設計PCB布局圖

詳情請見:
http://www.fairchildsemi.com/ds/FA/FAN104W.pdf
和
http://www.fairchildsemi.com/support/referencedesign/docs/RD-FAN104WMD-T06U010A.pdf