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TPS54561: 空载输出电压正常,接负载后电压异常

Part Number: TPS54561

利用TPS54561将输入的+28V电压转换为+5.5V,输出电流3.2A。

1.原理图

2.PCB

3. 空载在、输出电压+5.5V正常,如下图

4.接负载后输出电压异常,下图为接负载的输出电压

5.接负载时电感输入端电压

6.外围电阻电容取值如下图所示