我用TOP222P做3V1A/12V0.1A两组输出,TL431+PC817B,3V为主输出,所以取样在3V上,光电耦由12V供电,结果3V一带负载,12V输出马上跳变为40V左右,3V不变,空载状态3V/12.75V,而且跳变和3V所带负载大小无关???各位大侠帮忙分析一下啊,电路就是很经典的那种,变压器初级150T 12V20T
反馈12T,3V5T,是否不合适?初级电感量约1.7MH
急救TOP电压跳升!!
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@icmaster_0
你最好把反馈部分的电路图贴一下,然后在题目中写出XXXXXXXX(附图)这样才会有人帮你解决,没有图不好分析原因
图在此
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@最失败
图在此[图片]500){this.resized=true;this.width=500;this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/23/1099349067.jpg');}"onmousewheel="returnimgzoom(this);">
试试看这样接
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500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/23/1099389362.gif');}" onmousewheel="return imgzoom(this);"> 0
请用我这个电路, 比你那个简单实用多了.5.0V的部分多余, 负电压的多余, 去掉就可以了.
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500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/23/1099945607.jpg');}" onmousewheel="return imgzoom(this);"> 0
