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如圖所示,負載電流帶到0.27A,此時負載電阻為96ohm,輸出電壓24V還能穩壓,當負載電阻降到84ohm時,電壓降到16.7v,是不是圖中參數不對,還有,此時圖中R22,R23都比較燙.Q4也很燙,而且隨著負載電流的增大,5腳的鋸齒波頻率也在變化.各位老師幫忙啊?
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@飘逸
还有R23
我現在已經改成下圖,跟上面的差不多,一個為集電集輸出,控制PNP管,一個為射极輸出,控制NPN管.這樣可以減少電阻.可是效果同上面哪個一樣,負載不能大于0.27A.電感量減小更不行,奇怪了.
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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/20/1093647602.png');}" onmousewheel="return imgzoom(this);"> 0
@jr-y
電感用什么磁芯?气隙多少?
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電感EE-25气隙0.4-0.5mm,0.45*45T
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