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LM5036: IC Overheating Problem

senthilkumar m
Prodigy 100 points
Part Number: LM5036

Tool/software:

Hi,

We have designed an isolated DC-DC converter with the following specifications:

  • Input Voltage: 60 V to 90 V

  • Output Voltage: 13.8 V / 40 A

However, we are facing an IC heating issue within just a few seconds of operation. Could you please suggest what might be causing this problem and how to resolve it?

Any guidance would be greatly appreciated.

Regards,
M. Senthilkumar

  • 0
    TI__Guru 74115 points

    Hi,

    IC heating up, it means its bias current too high from the aux bias not take effect to substitute the LM5036 internal LDO. So you need to check if the aux bias voltage is high enough to bias the IC and to stop the internal LDO.

  • 0 in reply to Hong Huang
    Prodigy 100 points

    thank you , i will check and update you...

  • 0 in reply to senthilkumar m
    Prodigy 100 points

    Yes, the issue was due to the auxiliary bias voltage, which was caused by an IC solderability problem. This has now been corrected.

    However, we are currently facing an issue with the over-current cut-off. When the load reaches the over-current limit, the transformer produces a hissing noise. The current cut-off and current limiting functions are working properly, but we would like to have your clarification on this behavior and your advice on a possible solution.

    Thank you for your support.