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UCC27614: Mosfet Driver

Mall Of Robotics
Prodigy 20 points
Part Number: UCC27614

Tool/software:

VM voltage is 48V.
VCC voltage is 8V 100mA.
Does 8V 100mA prevent the mosfet driver from driving the mosfet?

Other than that, do you see any problems in the schematic?

Thanks.

  • 0
    TI__Genius 12075 points

    Hey,

    Thank you for reaching out to TI with your question regarding the UCC27614.

    Looking over your schematic, everything appears to be okay. I would advise that the RC filter on the input and the C43 and C29 bypass capacitors should be placed close to the gate driver in your layout.

    The Si MOSFET that you have selected performs more efficiently at 10V Vgs. So having VDD with 8V will sacrifice some efficiency there. VDD of 12V is more typical and would help improve this efficiency.

    Let me know if there are any questions.

    Thank you,

    William Moore

  • 0 in reply to William Moore
    Prodigy 20 points

    The point we are confused about is; 8V supply can only provide 120mA.

    In the UCC27614 datasheet, it says that even at peak (4ns) the mosfet gate has to be supplied with 8A or 10A.

    Does 120mA prevent this?

    Thanks...

  • 0 in reply to Mall Of Robotics
    TI__Genius 12075 points

    Hey,

    The supply of 8V and 120mA is sufficient as the 10A peak output current of the gate driver is a peak for sourcing/sinking current to turn the gate on/off of the FET. This is sourced by the local VDD bypass capacitor and the 8V/120mA supply recharges and helps supply that current.

    Please refer to Section 9 Power Supply Recommendations for guidance on selecting this bypass capacitance on VDD.

    Thank you,

    William Moore