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TPS54560 电压问题

Other Parts Discussed in Thread: TPS54560EVM-515, TPS54560

使用TPS5460,输入电压24V,输出12V ,4A,电路如下:

现在输出带3欧,100W水泥电阻,测量发现,输出端电压从11.95V到5V左右不停地跳变,请给予支持。

1.用示波器测量SW管脚,在电感33uH的时候,波形如下: