Fairchild FSEZ1016A PSR电源转换方案

2010-01-06 21:45:49 本站原创

Fairchild 公司的FSEZ1016A 是集成了功率MOSFET的初级侧调整(PSR)PWM,能简化需要CV和CC调整功能的电源设计,不需要次级反馈电路,绿色模式在轻薄负载时频率下降.固定的PWM频率43kHz,以降低EMI.此外还有带自动重起的超温保护(OTP)和过压保护(OVP),以及欠压锁住(UVLO),主要用在手机,无绳电话,PDA,数码相机和电动工具的充电器,替代线性变压器和RCC SMPS,离线高亮LED驱动器.本文介绍FSEZ1016A主要特性, PSR反激转换器电路图以及典型应用电路图和材料清单(BOM),5V/1A电源板布局图.

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 应用:

Battery Chargers for Cellular Phones, Cordless Phones, PDAs, Digital Cameras, Power Tools

Replaces Linear Transformer and RCC SMPS

Offline High Brightness (HB) LED Drivers