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I have designed a buck converter utilizing the LM5146RGYR. However, I'm encountering an issue with excessive heat generation on the board, even when operating without a load. The test conditions are 50V input and a 28V 15A output configuration.
I would greatly appreciate any assistance or insights you may have regarding this issue.
I have updated the value according to the calculator, but I'm still encountering excessive heat and an output voltage of only 14V instead of the expected 28V. Additionally, the output voltage is slowly increasing, and the temperature is rising simultaneously, without a load.
Could you please advise on how to resolve these issues?
Can you probe the switch node, inductor current and output voltage,
Furthermore, can you test without populating the filters at the output?
I also see some discrepancy in the values that you have filled in the quick start calculator v/s the schematic:
1. Output caps - you have mentioned 200uF - I only see 30uF in the schematic - that too will be derated at DC Bias. Also, ensure they are rated at ~2x the nominal output voltage.
