LM5025做的低端有源钳位,带载时钳位MOSFET功耗巨大,TO-252封装的管子没散热器最多几分钟就崩溃了.
![](http://u.dianyuan.com/bbs/u/68/1833611217921784.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20)
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/68/1833611217921784.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
输入:输入12V,输出24V2A,变压器4T:17T,工作频率400K
图中元件参数:C12=104,R14=10K,D3=CD4148,Q3=IRFR9220(200V3.6A1.5R),C13=100V0.1uF,R12=5.1R,C11=103,R13=10K,Q2=IRFR530
那位高人指点一下?
![](http://u.dianyuan.com/bbs/u/68/1833611217994063.gif)
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/68/1833611217994063.gif');}" onmousewheel="return imgzoom(this);">
![](http://u.dianyuan.com/bbs/u/68/1833611217994073.gif)
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/68/1833611217994073.gif');}" onmousewheel="return imgzoom(this);">
驱动波形
![](http://u.dianyuan.com/bbs/u/68/1833611217994101.gif)
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/68/1833611217994101.gif');}" onmousewheel="return imgzoom(this);">
漏极波形