• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 468 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC27537: Current consumption for UCC2753x

Mihai Vintila
Intellectual 590 points
Part Number: UCC27537

Hello, I am working on a design that will use the UCC2753x  (I use UCC27537 now) driving a power Mosfet (for brushed DC motor control).

I need to limit the output voltage from the UCC27537 to the gate of the Mosfet (the Mosfet limit is 20) - both to protect it from spikes and also for the situation when the supply voltage is 24V.

I am thinking to use a linear regulator in front of the UCC27537 but is not clear to me what is the current consumption of the device.

The datasheet shows some mA but since the peak output current is 5A I assume it should be in this range.

What current do I have to supply to the UCC27537 ?

Thanks,

Mihai

  • 0
    TI__Genius 12990 points

    Hi Mihai,

    The peak sourcing capability of the gate driver comes from the VDD to GND bypass caps (close to the IC). A larger (1uF or at least 10xCgate) low-ESR ceramic cap sources large peak driver current and a smaller (100nF) low-ESR ceramic cap helps to filter noise and source peak current even faster. The peak sinking capability depends on the Rdson of the lowside totem pole output stage and loop impedance of the turn off path. Also, the gate driver quiescent current is less than 1mA and is sourced from the VDD pin. You should have no problem using an LDO to buck down the supply to meet MOSFET specs as long as the VDD caps are there. You can follow the datasheet section 11 power supply recommendations last paragraph as well as section 12, layout guidelines for the VDD pin.

    Does this help to answer your question? let me know if you have any more.

    Thanks,

  • 0 in reply to Jeffrey Mueller
    Intellectual 590 points
    Thank you very much !

    Mihai