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tps40211工作不正常

Other Parts Discussed in Thread: TPS40211

输入8-15v 输出30-36 0.9a  当我tps40211的2脚加100nf电容时,输出电压只能升到28v,还不具备带负载的能力,  当我把100nf去掉之后,空载输出正常,但是输出电流只有240ma, 而且有声音, 理论电流=0.26V/0.5R=520ma  此时的2脚电压类似方波在高低电频变化,频率大概是5k,占空比大概是0.5