• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 245 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.

UCC21750: Power supply current consumption in steady state

Anoop kumar N
Intellectual 998 points
Part Number: UCC21750

Hello experts,

My gate driver power supply have output current capability of 80mA.

The peak source sink current demand occur at Rising and falling edge of Gate source voltage ryt ?

and this current demand is supplied by the capacitor placed closer to the VDD-COM pins. ryt ?

How much current will it take from the power supply in the steady state of Gate Source voltage ? is it only the quiescent current specified in the data sheet ?

Thanks and regards

Anoop kumar N

  • 0
    TI__Expert 7473 points

    Hi Anoop,

    Please refer the below tech note for peak source sink current with respect to gate voltage.

    https://www.ti.com/lit/an/slla387a/slla387a.pdf?ts=1689691862479&ref_url=https%253A%252F%252Fwww.google.com%252F

    In a way, decoupling capacitors act as a very small, local power supply for ICs. If the power supply very temporarily drops its voltage (which is actually pretty common, especially when the circuit it's powering is constantly switching its load requirements), a decoupling capacitor can briefly supply power at the correct voltage. This is why these capacitors are also called bypass caps; they can temporarily act as a power source, bypassing the power supply.

     Ivddq is the supply current in the quiescent state (when the circuit is not switching, and inputs are held at static values). Yes, only the above 2 cases for OUTH high and OUTL low are specified in the datasheet. 

    Hope this helps!

    Best,

    Pratik