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LM5050-1: LM5050 for RPS power share

Tommy Tzeng
Genius 4805 points
Part Number: LM5050-1

Hi Sir,

we schematic have problem? could help us check and give suggestion or comment.thank.

the condition as below:

Power supply 1 (PSU_54V) is internal power. The output is +54V to GND==>PSU's +54 is connected to Vin of LM5050.

Power supply 2 (RPS_54V) is external power output is -54V to GND==>PRS GND is connected to Vin of LM5050.

  • 0
    TI__Genius 16305 points

    Hi Tommy.

    MOSFETs are rated only 25V Vds and this is not good for a 54V application. Minimum 80V rating of Vds or recommended to have 100V rated MOSFETs.

    MOSFET orientation of Q1, Q2, Q3 and Q4 is incorrect. Source of the MOSFET Q1 and Q2 should be connected to PSU_54V and source of MOSFET Q3 and Q4 should be connected to RPS_54V.

    Can you check the grounding scheme, or share diagram showing the two PSUs and how the common ground is connected.
    I am not able to quickly see that from schematic due to many names of schematic.

    Regards,
    Kari.

  • 0 in reply to Karikalan Selvaraj
    TI__Genius 16305 points

    Hi Tommy,

    Grounding scheme needs to be verified from your end, otherwise if you have more questions let us know.

    If you think your question answered, click "this resolved my issue" button at the end.

    Regards,

    Kari.