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LM74810EVM: When Hgate go high the Vin will drop

Colt Zhang
Expert 5490 points

Part Number: LM74810EVM

hi Team,

customer use LM74810-q1, when EN on , Hgate go high, the Vin will have a drop , you can see the next picture, i think we can accelerate the Hgate go high, but how to accelerate the hgate go high.

  • 0
    TI__Guru 57737 points

    Hi Colt,

    If the input power supply has enough source current capability, there should be no input voltage drop when HGATE is turned ON. The current flowing from input to output during HGATE startup can be higher if the output capacitance is higher. In order to limit/reduce the current drawn from input during startup, you will have to slow down the HGATE ramp up further by increasing C212. If the input power supply source current capability is the root cause of Vin drop issue, you can increase C212 or increase the current limit of input power supply.

    IN case you want to speed up the turn ON of HGATE, you can DNP C212.