​ 安森美新方案发布 | 高能效USB供电方案

Release time：2022-05-16
author：Ameya360
source：网络
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　　领先于智能电源和智能感知技术的安森美(onsemi，美国纳斯达克股票代号：ON)，推出用于USB供电(PD)设计的三件一套新产品。新的控制器和驱动器提供创新的功能，能显著减少高能效AC-DC电源的物料单(BOM)含量，尤其是在100 W以上的负载范围。

​ 安森美新方案发布 | 高能效USB供电方案

　　安森美电源转换方案分部高级总监Shane Chilton说：

　　USB PD是个重要且不断增长的应用，但要满足其能效和尺寸要求对设计人员是严峻的挑战。设计人员采用我们这套新产品，可以从现有BOM中删除多达15个器件，降低设计成本，同时确保满足USB PD应用的严苛能效和性能标准。

　　NCP1345是一款准谐振(QR)反激式控制器，应用于高性能离线电源和USB Type-C PD快速充电。高频QR工作(高达350 kHz)能减小磁性器件的尺寸。由于内置恒定输出电流限制，NCP1345兼容受限制电源(LPS)的要求，而快速频率返走功能确保出色的轻载能效。

　　安森美另一款新品NCP1623是小尺寸的升压功率因数校正(PFC)控制器，额定功率达300 W，应用于USB PD快充适配器和计算机电源。该器件在重载时以临界导电模式(CrM)工作，然后随着负载的减少进入非连续导电模式(DCM)，以在额定负载和轻载时都能实现能效最大化。NCP1623在低输入电压可将能效提高到2%，睡眠模式用电 <100 μA，优化空载输入电源状态。

　　NCP4307是一个高性能驱动器，可在多种高性能开关电源拓扑中与同步整流(SR)MOSFET一起使用。该器件将从内部一个200 V CS引脚自供电，实现上桥配置和低VOUT，而不需要一个辅助电源。双VCC引脚选择最佳VCC源端以尽量降低损耗，从而优化宽范围VOUT应用的设计。

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