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LM27402: 输出电压正常却无法提供输出电流

Part Number: LM27402

如题,空载电压正常,接负载仪无反应,甚至还会掉输出电压,无解了,特地上论坛求助,感谢TI工程师无私解答,下面附上设计图。

希望可以得到layout建议!