UC3842做的開關電源,空載時變壓器有響聲
如題,帶載后就沒有了響聲,附上原理圖,各路高手幫忙看看,變壓器的電感是0.5mH 1198361257319746.pdf
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空載時,4腳的波形
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/83/1198361257392014.jpg');}" onmousewheel="return imgzoom(this);">6腳空載的波形
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/83/1198361257392033.jpg');}" onmousewheel="return imgzoom(this);">
空載時,4腳的波形
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/83/1198361257392014.jpg');}" onmousewheel="return imgzoom(this);">6腳空載的波形500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/83/1198361257392033.jpg');}" onmousewheel="return imgzoom(this);"> 0
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