Fairchild 公司的FSEZ1016A 是集成了功率MOSFET的初級側調整(PSR)PWM,能簡化需要CV和CC調整功能的
電源設計,不需要次級反饋電路,綠色模式在輕薄負載時頻率下降.固定的PWM頻率43kHz,以降低EMI.此外還有帶自動重起的超溫保護(OTP)和過壓保護(OVP),以及欠壓鎖住(UVLO),主要用在手機,無繩電話,PDA,數碼相機和電動工具的充電器,替代線性變壓器和RCC SMPS,離線高亮LED驅動器.本文介紹FSEZ1016A主要特性, PSR反激轉換器電路圖以及典型應用電路圖和材料清單(BOM),5V/1A
電源板布局圖.
FSEZ1016A (EZSWITCH™) Primary-Side-Regulation PWM Integrated Power MOSFET The primary-side PWM integrated power MOSFET (EZSWITCH™), FSEZ1016A, significantly simplifies power supply designs that require CV and CC regulation capabilities. FSEZ1016A controls the output voltage and current precisely with only the information in the primary side of the power supply, not only removing the output current sensing loss, but also eliminating all secondary feedback circuitry.
The green-mode function with a low startup current (10μA) maximizes the light-load efficiency so the power supply can meet stringent standby power regulations.
Compared with conventional secondary-side regulation approach; the FSEZ1016A can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability.
FSEZ1016A is available in a 7-pin SOIC package.
FSEZ1016A 主要特性:
Constant-Voltage (CV) and Constant-Current (CC) Control withou Secondary-Feedback Circuitry
Accurate Constant Current Achieved by Fairchild’s Proprietary TRUECURRENT™ Technique
Green Mode: Frequency Reduction at Light-Load
Fixed PWM Frequency at 43kHz with Frequency Hopping to Reduce EMI
Low Startup Current: 10μA Maximum
Low Operating Current: 3.5mA
Peak-Current-Mode Control in CV Mode
Cycle-by-Cycle Current Limiting
Over-Temperature Protection (OTP) with Auto-Restart
Brownout Protection with Auto-Restart
VDD Over-Voltage Protection (OVP) with Auto-Restart
VDD Under-Voltage Lockout (UVLO)
SOIC-7 Package
FSEZ1016A 應用:
Battery Chargers for Cellular Phones, Cordless Phones, PDAs, Digital Cameras, Power Tools
Replaces Linear Transformer and RCC SMPS
Offline High Brightness (HB) LED Drivers
圖1.FSEZ1016A 功能方框圖
圖2.FSEZ1016A 典型應用電路圖
圖3.簡化的PSR反激轉換器電路圖
圖4.FSEZ1016A 典型應用電路圖
Design and Application of Primary-Side Regulation (PSR) PWM Controller and EZ-Switch™ FAN100 / FAN102 / FSEZ1016A / FSEZ1216
圖5.FSEZ1016A(FAN100+MOSFET) 5V/1A應用電路圖
材料清單(BOM):
圖6.PCB 布局案例(5V/1A, 5W
電源板)
