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UCC3895 :Phase Shift Full Bridge Converter

Part Number: UCC3895
Other Parts Discussed in Thread: UCC28950

Hi, I would like to get help with UCC3895.

I was designed phase shift full bridge converter 400V/2A.

But the UCC3895 doesn't operate that effective duty is 0.

If effective duty is 0, duty of leading lag is change 

I don't know why and I want method.