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LM5116应用问题,空载时输出电压太低,DEMB几乎无作用。

Other Parts Discussed in Thread: LM5116

 I was tuning the LM5116.

My application is 36~72V input, 24V output, and load current is 4A。

There was two problems.

The first is why the output voltage is about 5V when the load is light.

The second is why the LO is not low when the RDEMB=0.

输入电压36~72V, 输出电压24V,最大额定输出电流4A,电感100uH.

调试空载时输出电压约3.8V,电子负载加载后能正常输出24V、2A。RDEMB=0时LO仍有PWM波形,是不是DEMB功能不起作用?