FairchildFAN104W平板电脑和智能手机电池充电解决方案

Fairchild公司的FAN104W是高频初级调整的PWM控制器,能提高低功率反激转换器的性能.待机功耗小于30mW,满足能量之星五星标准,突发模式工作电流600uA,具有输出短路保护,输出过压保护(VSOVP),VDD过压保护和超温保护等功能,主要用在智能手机,PAD,PDA和数码相机电池充电器等.本文介绍了FAN104W主要特性,方框图,典型应用电路以及10W平板电脑和智能手机充电器参考设计主要特性,电路图,变压器电路和PCB布局图.

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应用:

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

Best choice to replace linear transformer and RCC SMPS

图1.FAN104W方框图

图2.FAN104W典型应用电路图

10W平板电脑和智能手机充电器参考设计


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充电器参考设计主要特性:

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: 600gA(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

图3.10W充电器参考设计电路图

图4.10W充电器参考设计变压器电路图

图5.10W充电器参考设计外形图

图6.10W充电器参考设计PCB布局图

详情请见:
http://www.fairchildsemi.com/ds/FA/FAN104W.pdf
和
http://www.fairchildsemi.com/support/referencedesign/docs/RD-FAN104WMD-T06U010A.pdf