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/66/254471212545805.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">viper22应用问题求教
小弟刚接触开关电源,用viper22设计了一款输出12V,0.8A的电源.测试的时候发现上电有输出,空载输出不稳定,需要加个40mA左右的负载才可以稳定,加载后达不到输出电流要求.测试发现Viper22电源端电压有39V,可我设计的变压器的反馈级输出只有18V,继续查发现二极管D6前无电压,继续查发现变压器反馈级无输出.各位大侠可能是什么地方有问题了?元器件没有问题已经查过了.
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