工作穩(wen)不穩(wen)定，也要看其中(zhong)電(dian)(dian)(dian)源(yuan)(yuan)IC的質量。選擇電(dian)(dian)(dian)源(yuan)(yuan)IC（元(yuan)(yuan)器(qi)件）需要考慮(lv)到穩(wen)定性(xing)、電(dian)(dian)(dian)路要求(qiu)、成本、體(ti)積以(yi)及重量等因素，下面是常見開關(guan)電(dian)(dian)(dian)源(yuan)(yuan)IC（元(yuan)(yuan)器(qi)件）選擇原則，選擇合(he)適的開關(guan)電(dian)(dian)(dian)源(yuan)(yuan)IC將大大延長電(dian)(dian)(dian)路壽命，也可以(yi)減少(shao)電(dian)(dian)(dian)源(yuan)(yuan)適配器(qi)的故障。

1、低(di)功耗低(di)壓差(LDO)線性穩(wen)壓器的使用最佳環境(jing)

低壓(ya)差(LDO)線性穩壓(ya)器的(de)使(shi)用(yong)最佳環境：輸(shu)(shu)出電(dian)壓(ya)中紋波、噪聲特別小的(de)場合(he)，輸(shu)(shu)入(ru)輸(shu)(shu)出電(dian)壓(ya)差不大，輸(shu)(shu)出電(dian)流不大于100mA，便攜(xie)儀器適用(yong)

　2、電荷泵(beng)

多(duo)數(shu)便(bian)攜儀器中都需要(yao)負電(dian)源，電(dian)流需求不(bu)大，使用電(dian)荷泵IC組成電(dian)壓反轉電(dian)路，搭配LDO線性(xing)穩壓器的電(dian)荷泵IC更可達到噪聲(sheng)小、輸出穩壓

3、電源IC應選擇精(jing)度(du)高的而不(bu)選擇集成多功能(neng)的IC

通常(chang)電源(yuan)IC的精度一般為±2%～±4%，精度高(gao)的可達(da)±0.5%～±1%，根據電路需要選擇合適電路的IC不僅(jin)減(jian)(jian)低成本(ben)并且提升(sheng)電路穩定性，如果電路中沒有用到關閉電源(yuan)功(gong)能、開關電源(yuan)結構中無微處理器(μP)或微控制器(μC)的情況下更沒必要選擇帶關閉電源(yuan)功(gong)能或輸出(chu)電源(yuan)工作狀態(tai)信號的器件，這將(jiang)大大減(jian)(jian)低成本(ben)，IC體積也(ye)小

4、選擇匹配(pei)電源(yuan)適配(pei)器電路(lu)的IC

電(dian)(dian)(dian)(dian)源適配器(qi)工作電(dian)(dian)(dian)(dian)流(liu)最大(da)值最好為電(dian)(dian)(dian)(dian)源IC最大(da)輸出電(dian)(dian)(dian)(dian)流(liu)lomaxde的70～90%,避免(mian)大(da)馬(ma)拉小(xiao)車浪費現象(xiang)同時也(ye)避免(mian)電(dian)(dian)(dian)(dian)源IC過載。電(dian)(dian)(dian)(dian)源IC有(you)三個(ge)重要(yao)參數(shu)需(xu)要(yao)了解，線路需(xu)求(qiu)IC主要(yao)看這個(ge)三個(ge)參數(shu)來確定合不合適，分別是：輸入電(dian)(dian)(dian)(dian)壓VIN、輸出電(dian)(dian)(dian)(dian)壓Vo及(ji)最大(da)輸出電(dian)(dian)(dian)(dian)流(liu)Iomax