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/51/1174919821.gif');}" onmousewheel="return imgzoom(this);">
MC34063 step down driver 1W*2 or 3W*1
别看成本低,但体积小,电路简单,效率可达65%
大家侃侃如何改进它的效率和驱动能力
