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UCC21520-Q1: Gate Drive Strategy for Paralleled MOSFETs in PSFB Topology

Umit Anasiz
Prodigy 101 points
Part Number: UCC21520-Q1
Other Parts Discussed in Thread: CSD19536KTT

Tool/software:

Dear Ti,

We are considering connecting the input MOSFETs in parallel on the PSFB input side to increase the current capacity, and we will be using the UCC21520-Q1 as the driver.

 

In the block diagram, for positions Q1, Q2, Q3, and Q4, we plan to use four CSD19536KTT MOSFETs in parallel for each position. Should we connect the gates of the four MOSFETs in position Q1 in parallel and drive them with a single UCC21520-Q1, or should we use a separate gate driver for each MOSFET?

  • 0
    TI__Intellectual 1605 points

    Hi Umit,

    Since you are planning to drive 4 MOSFETS with UCC21520-Q1 in your system, you will need to use 2 gate drivers, so that you have the ability to control the gate of each individual MOSFET separately. With 2 of the UCC21520-Q1 in your system, I would recommend using one of them to drive Q1 and Q4, and then the other one to drive Q2 and Q3.

    Best regards,

    Will

  • 0 in reply to Will Appelt
    Prodigy 101 points

    In our case, for position Q1, we intend to connect four MOSFETs in parallel to increase the current handling capacity. Can we drive the gates of all four MOSFETs through a single channel of the UCC21520-Q1, or what would be your recommendation? Best Regards...

  • 0 in reply to Umit Anasiz
    TI__Intellectual 1605 points

    Hi Umit,

    You are definitely able to control multiple parallel MOSFETs with one output channel of the UCC21520-Q1. However there are a few considerations when designing a system this way. Feel free to read up on this Application Brief, which will provide greatly helpful information about the best practices when paralleling MOSFETs.

    Best regards,

    Will