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开关电源

Other Parts Discussed in Thread: TPS56528

 求助各位大神,做了一个TPS56528的电路板,电路板原理图如图,没加负载时输出电压很稳定为1.2V,符合要求,但是加过负载后输出电压就会下降到0.3V,没一点负载能力,怎么解决?谢谢