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TPS54062输出不正常,换芯片就OK



我用TPS54062做了个DC/DC,输入10V~40V,输出3.3V,3.3V功耗大约为30mA,我就按照datasheet中提供的案例设计的 ,但在实际调试中,有大约30%的芯片无输出(0.7V),示波器看无震荡波形,有的芯片输出高电压(约6V),换芯片基本能好,请帮忙解决,多谢。