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TPS43060: Using an external gate driver

Anthony Oliveti
Prodigy 80 points
Part Number: TPS43060

Hello,

I need more than 50mA average gate drive current. Can I tie VCC to Boot, and SW to PGND and drive an external gate driver IC?
If not, what would be the recommendation?

Thanks,

Anthony

  • 0
    TI__Guru 65200 points

    Hello Anthony,

    The VCC maximum current is defined minimum as 50mA and you still want to add an external driver?

  • 0 in reply to Brigitte
    Prodigy 80 points

    Hi Brigitte, 

    Yes, that is correct.
    I need approximately 100mA of average gate current. 

    Regards,

    Anthony

  • 0 in reply to Anthony Oliveti
    TI__Guru 65200 points

    Hello Anthony,

    I did not test it, but I expect that it works. On the other side there might be complementary drivers that do not need 2 input signals, but are ok with just the low side signal.

    I expect you want to drive several paralleled MOSFETs, so possibly a better solution would be to split the power by using 2 TPS43060 in parallel? The advantage is that you can interleave them or reduce the local power dissipation.

  • 0 in reply to Brigitte
    Prodigy 80 points

    Hi Brigitte,

    My concern with a complementary driver is that I would lose the adaptive dead time feature of the TPS43060 and have to set it manually. Is that a correct assumption?

    I had considered using two devices in parallel. 

    My idea was to use make the first 43060 sort of a "master" and operate it normally, and derive the FB signal for the second 43060 from the output voltage difference between the two.

    Can you give some guidance on how to configure two TPS43060 for interleaved operation? Are there any app notes I can use as a reference?

    Thanks,

    Anthony Oliveti