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LM5060-Q1: MOS damage root cause discuss

fusheng Yu
Prodigy 90 points
Part Number: LM5060-Q1
Other Parts Discussed in Thread: LM5060

Tool/software:

Hi team, 

I am testing the LM5060 circuit OCP , I find a question, When the output pre-loading 10A by electric Load, and DC Source Current limit setting 10A. 

When I power on the source, the MOS will short damage.

But if the DC Source limit add to 20A , the circuit is normal POWER ON. 

I am confused now. Could you help to analysis the waveform.

Besides, How to calculate the 

pre-loading 10A, DC Source 10A limit, POWER ON ( MOS damage g,d,s short)

 

pre-loading 10A, DC Source 20A limit, POWER ON

Circuit:

  • 0
    TI__Guru** 105251 points

    Hi,

    Why there is peak of more than 10A if the pre-loading is 10A ?

    How is Vin changing for both test cases ? 

    Best Regards,

    Rakesh

  • 0 in reply to Rakesh
    Prodigy 90 points

    Hi Rakesh,

    The Vin don't change in the two case,  set on 12V.

    10A Loading is used by Chroma Electric Load.

    Output terminal is connected to Electric Load.

    I'm not sure the reason why currect overshoot o ever 10A, guess the Electric Load compensate at output rail voltage rising.

    Maybe I can try to change the Electric Load Von point setting.

  • 0 in reply to fusheng Yu
    TI__Guru** 105251 points

    Hi Fusheng,

    fusheng Yu said:

    The Vin don't change in the two case,  set on 12V.

    Rakesh-> There should be some dip in the 12V as load is drawing more current than 10A. We can get clarity, if you probe VIN in oscilloscope.

    Can you test with actual end application load instead of electronic load. That gives real picture and understanding on suitability of LM5060 for your application.

    Best Regards,

    Rakesh

  • 0 in reply to Rakesh
    Prodigy 90 points

    Hi Rakesh, 

    I probe the Vin in Oscilloscope, but I see the waveform with oscillation , the Vin voltage range from 8V ~ 13.6V, 

    Rakesh said:
    Can you test with actual end application load instead of electronic load.

    I'll try it. 

  • 0 in reply to fusheng Yu
    TI__Guru** 105251 points

    Hi Fusheng,

    ok. looking forward for your test results with actual load

    Best Regards,

    Rakesh