Offline Switchers Come in Tiny Packages
当工程师考虑离线开关从电信和数据通信设备,个人电脑和工业电源系统,他们主要认为笨重的交流/直流前端解决方案的形式多种多样,如砖,模块,和开放的框架。然而,有许多应用在离线开关由交流电源供电的需要小包装或必须占用主板上的一个小空间。一些例子:USB适配器电源媒体播放器、电子阅读器和GPS设备;低成本的、离线LED驱动器照明应用的高功率因数达到国际总谐波失真(THD)要求,电磁兼容,安全。离线开关也被用来作为在PC和笔记本电脑的备用电源,以及在智能手机和其他移动设备小巧的充电器。关键是有许多应用在离线AC / DC开关是在小的形式因素的需要。
本文将探讨从崔公司飞宏美国,推荐的电源解决方案,和XP的电源。除了脱落一些轻的紧凑的离线开关的性能,它还将确定关键特征和提供给工程师具体产品的好处。
Compact external switchers
CUI, Inc., for instance, has readied an ultra-compact 5 W wall-plug adapter with integrated USB connector (Figure 1), the EPSA050100U-I38-EJ. With a footprint of just 1.61 x 1.18 in. (41 x 30 mm), the adapter is among the industry’s smallest AC/DC power supply to integrate USB connection, making it suitable for small mobile devices. In addition, it offers level V energy-efficiency compliance for green design requirements with a no-load power draw of less than 0.1 W. Rated for an output of 5 VDC at 1 A, the high-density EPSA050100U-I38-EJ operates at AC input voltages ranging from 90 to 264 VAC. Safety marks include UL/cUL, PSE, and LPS (limited power source)。 What is more, the external adapter also meets EN55022 Class B limits for conducted and radiated EMI and provides protection for overvoltage, overcurrent, and short-circuit conditions.
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