“小太阳”降低34063纹波!

1、输出电路,5V、1A
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/36/1134001183.gif');}" onmousewheel="return imgzoom(this);">

2、室温0度左右,VCC纹波200mV
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/36/1134001202.gif');}" onmousewheel="return imgzoom(this);">

3、取暖用的“小太阳”加温10分钟
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/36/1134001215.gif');}" onmousewheel="return imgzoom(this);">

4、板温约60度,VCC纹波降低到150mV
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/36/1134001230.gif');}" onmousewheel="return imgzoom(this);">

请教:升温后,波形弯曲变严重,是由什么因素造成?