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请教IR2110驱动问题

最近做了块板子,在Buck电路中用IR2110驱动IGBT,电路如图示

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其中VDD和VCC_IR是12V电源,下图是主电路上电前(1)和上电后(2)的HO波形图:

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/62/2289661204039906.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
                               (1)

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                               (2)

Buck输入电压是17V,请问为什么会出现纹波,是因为IR2110中电容参数不对吗?还是因为主电路中干扰.另外,我的Buck电路输入17V时,输出为什么达到了6V(占空比20%).请各位有经验的长辈们指教.
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2008-03-24 16:37
你测量的是对哪里的电压/
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