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TPS40057问题求教

Other Parts Discussed in Thread: TPS40057

原理图如上图,22~28V输入  输出21.5V  PCB拿回来后空载调试,输出不正常,输出电压在0~11V左右震荡,且空载电流有350mA。没发现PCB上有明显的断路现象。求教原理设计有没有什么问题,谢谢!!