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LM5026EVAL: Doubts regarding 33A Current limit of LM5026 Evaluation board

Aneesh TS
Expert 1735 points
Part Number: LM5026EVAL
Other Parts Discussed in Thread: LM5026

Hi friends

I have a doubt regarding LM5026 Evaluation board. In LM5026 Evaluation board the output current is limited to 33A(Hiccup over current).

There is no current sensing at output side.Then How this current limit achieved in LM5026 Evaluation board?. Which component in the schematics decides 33A current limit.

Regards

Aneesh

  • 0
    TI__Mastermind 25570 points

    Hi Aneesh

    The current limiting is done on the primary side. The primary side current is sensed by the current transformer (T1) in the Drain of Q1.

    Regards

    Colin

  • 0 in reply to Colin Gillmor
    Expert 1735 points
    Hi colin,

    I have tested this board at two different input voltage.
    In first case lower input voltage it went to over current at 2.6A input cuurent.
    In second case at higher input voltage it went to over current at 1.8A input current. In both cases output current was 33A.
    so the current limit is done not in primary side. It is mentioned in the datasheet under section 8.2 that the regulator output current is limited to 32A.

    Regards
    Aneesh