Fairchild FSEZ1317低待机功耗PWM电源方案

Fairchild 公司的FSEZ1317是集成功率MOSFET的初级边调整（PSR）的PWM控制器，待机功耗低于30mW，高电压起动，恒压（CV）和恒流（CC）控制而不需要次级反馈电路。FSEZ1317主要用在手机，无绳电话，PDA，数码相机等充电器以及替代线性变压器和RCC SMPS等。本文介绍FSEZ1317主要特性，方框图以及典型典型应用电路图。

FSEZ1317： Primary-Side-Regulation PWM with POWER MOSFET Integrated

This third-generation Primary Side Regulation (PSR) and highly integrated PWM controller provides several features to enhance the performance of low-power flyback converters. The proprietary topology, TRUECURRENT™, of FSEZ1317 enables precise CC regulation and simplified circuit design for batterycharger applications. A low-cost, smaller, and lighter charger results, as compared to a conventional design or a linear transformer.

To minimize standby power consumption, the proprietary green mode provides off-time modulation to linearly decrease PWM frequency under light-load conditions. Green mode assists the power supply in meeting power conservation requirements.

FSEZ1317主要特性：

□ Low Standby Power Under 30mW

□ High-Voltage Startup

□ Fewest External Component Counts

□ Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry
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