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/32/1123037978.gif');}" onmousewheel="return imgzoom(this);">OZ960驱动六灯管,遇到问题,请大家讨论(附图)
如全部接上电路,灯一闪就灭了.切断后面电路,用两路稳压源模拟反馈,分别接至FB(1.25V),OP(2V),今测得,当供电电源VDDA为5V时,PWM输出一直为高电平,此时REF没有输出.VDDA低于4V时,有PWM输出,此时REF有输出,随VDDA的变化而变化,而且此时关闭模拟反馈,对输出波形无影响.请大家分析分析原因,看看我的电路图有没有错.谢谢!
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/32/1123037978.gif');}" onmousewheel="return imgzoom(this);">
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/32/1123037978.gif');}" onmousewheel="return imgzoom(this);">全部回复(38)
正序查看
倒序查看
就此电路,各位高手,能给出一些解决问题的参考意见吗
不好意思,上次的图截错了
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/32/1124024614.gif');}" onmousewheel="return imgzoom(this);">
不好意思,上次的图截错了
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/32/1124024614.gif');}" onmousewheel="return imgzoom(this);"> 0
OZ960,变压器原边电压波形,占空比很小,怎么调整?我调DIM,FB都没用.
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/32/1124242526.gif');}" onmousewheel="return imgzoom(this);">
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/32/1124242526.gif');}" onmousewheel="return imgzoom(this);"> 0
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/32/1124330187.gif');}" onmousewheel="return imgzoom(this);">
