用UC3842做多路输出开关电源

输入为36-72V,输出5V/0.5A,15V/0.3A,15V/0.15A,-15V/0.15A,12V/1A共5路!UC3842控制,开关频率选用40K,效率0.85,占空比最大0.45.原理图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/74/2678911235120466.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
2678911235120312.sch
请教大家可行否??还有高频变压器如何设计??