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LM5116: LM5116 high side FET drain to source short

Red Yen
Expert 4360 points
Part Number: LM5116

Hi Team 

my customer would like to know the operation behavior while high side MOSFET drain to source short 

see following circuit 

thanks a lot 

  • 0
    TI__Guru 58171 points

    Hello Red

    If the high-side MOSFET is short, there will be a shoot-though when the low-side MOSFET turns on and the output of the input power supply will be short.  

    -EL  

  • 0
    TI__Expert 4360 points

    Hi Eric, 

    the experiments result in EVM, are you able to explain the operation principle 

    In case of high side mos short circuit (Q1 DS short),
    supply the Vin into the board from DC source 

    I saw that the gate of low side MOS (Q2) is still working,
    But the DC source used as input is limited.
    The lines and parameters used are as follows, no changes have been made.

    Before Short
    Vin = 22V, Vo = 5V 0A

    After Short Q1DS
    Vin=7V, Vo=7V 0A

    Red Yen 

  • 0 in reply to Red Yen
    TI__Guru 58171 points

    Hello Red 

    If the input power supply effectively limits the shoot-through current, the system will restart or will stay at the condition that the amount of shoot-through current equals with the current limit level of your input power supply.

    -EL