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LM5175 BUCK mode can't work well

user46172831
Prodigy 60 points
Other Parts Discussed in Thread: LM5175

Hi:

I'm using LM5175 to convert 6s baterries to 24V. Vin is about 22V-25.2V, Vout is 24V, Iout is 18A, Fsw=300KHz.

When I input 25.2V, the output is 25.1V. When I input 24.8V, the output is 24.75V. The Buck mode can't work well.

When I input 22V-24V, the out voltage is 24.2V. It seems the boost mode work well.

When I input 25V, I test the SW1 and SW2. I find the duty of SW1 and SW2 are same.