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我用TNY276设计了一款19V/12W的电源,测试一段时间后,电源输出电压只有0.8V,TNY276的D脚没有开关波形,把BP/M脚的电容C4短路后,电源又能自行启动,请问高手这会是什么问题呢?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/55/585161183777970.bmp');}" onmousewheel="return imgzoom(this);">
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