输出要求:Vcc=5V,输出电流为0到60mA.
其中输入DC_IN端VSS为50V DC,R25较小,R24、R26都要在10K以上,分压使7805输入端得到10-20V之间的电压,这样行不行啊,请哪位好心人帮我确认一下三极管可以用哪个型号的,三个电阻怎样取值吧.谢谢!
![](http://u.dianyuan.com/bbs/u/47/1163342128.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/47/1163342128.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">