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LM5146: LM5146 no-load heating problem.

Part Number: LM5146

Tool/software:

 We are  rokae in china,We used LM5146 to achieve 48V to 24V, 300kHz switching frequency, and found that the no-load power consumption was relatively high, with 0.67W. Then we used diode simulation function, and the no-load power consumption was reduced to 0.2W, but this is still higher than our expectations. Is there any other way to optimize it?   

P2_24V.pdf