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tps55340带不了负载是怎么回事



按照ti的数据手册做了一个电路,在实验电源接了一个电表(测试电流)然后接到板子上,空载的时候测试,输出11.98v,电流在0.5~2.2ma之间波动,然后外加一个负载后就出现类似短路的现象,电源就像短路了一样跳,电表显示电流很小,最大值也就200多ma,我接的负载电阻式86欧姆