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LM5168: Current limit

David Huang
Intellectual 2285 points
Part Number: LM5168

Hi Team,

I found the datasheet of LM5168 marked OCP at 0.42A, but the EVM LM5168FEVM current limit is at 0.25A and OCP at 0.3A.

Could you let me know what causes this difference?

Additionally, EVM outputs are rated as 10V/0.25A, I set the load to 0.25A using electronic load, but found the voltage failed to reach 10V in this case, seems like some protection was triggered.

Could you please advise on this as well?

Regards,

  • 0
    TI__Expert 5290 points

    Hi David,

    1. 0.42A is HS peak current limit while 0.25A of LM5168FEVM is DC value. 

    2. Are you testing on LM5168FEVM? What is Vin and what is the load for the primary and secondary side, respectively? Can you share the waveforms to show the abnormality? Better to capture SW, Vsec, Iprim and Vo waveforms.

    Regards,

    Hongjia

  • 0
    TI__Expert 5290 points

    Hi,

    As there is no activity for quite a few days, I will close this thread first. Let us know if you have further questions. 

    Regards,

    Hongjia