资料下载
LR7启动高效的开关电源电路
分享资料个
This application note explains how to use the Supertex LR7 as a start-up device for an SMPS and demonstrates its many advantages compared to the conventional resistor and zener diode circuit used for this purpose. This note shows how the LR7 provides a simple start-up circuit solution for industry standard low voltage PWM ICs having start thresholds of 13.9V to 18.8V. For PWM ICs with start threshold voltages outside this range， refer to Supertex application notes AN-D25 and AN-H28.
The circuit in Figure 1 is an off-line SMPS using the Supertex LR7 as a start-up circuit that provides the required VCC voltage for the Unitrode UC3844 PWM IC during start-up.
声明：本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。文章观点仅代表作者本人，不代表电子发烧友网立场。文章及其配图仅供工程师学习之用，如有内容侵权或者其他违规问题，请联系本站处理。 举报投诉
- 相关下载
- 相关文章
