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LM5145 占空比到不了99% 48V输入只能47V输出

Other Parts Discussed in Thread: LM5145

LM5145 手册标的能到99%占空比,实际占空比到不了99% 48V输入只能47V输出,带载10A后降到46V。占空比只能96%不到。是什么原因?用凌特的IC就可以到99%占空比。电路图见附件LM5145 DEMO.pdf