UCC28950的反馈电路是否可以设计成类似于UCC3895的光耦隔离形式?
时间:10-02
整理:3721RD
点击:
各位大侠,小弟有个问题请教!
UCC28950的反馈电路(EA+、EA-、COMP 3个pin的设计)是否可以设计成光耦隔离的形式,类似于UCC3895(EPA、EPN、EAOUT 3个pin的设计),或是有哪些地方还需要改进一下的?因为客户要求我们的高功率产品必须都要加入隔离的方案,以做一些电气高压测试时的保护。
谢谢!
Yes, you can use the UCC28950 for primary side control withan opto coupler. You will just need to setup the voltage amplfier as a voltage follower by tying the COMP pin th EA-. You would then tie EA+ with a pull up resistor greater than 1K to Vref. Then you would tie the EA+ pin to the collector of the optocoupler and use the standard opto feedback network.
hi Trevor,
Thanks very much!