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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 (V) 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: 600A(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
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