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 (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
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
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