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Thread: Using a driver (IRS21844S) without the boot cap circuit

  1. #1
    New Member New Member DanBrunermer is on a distinguished road
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    Using a driver (IRS21844S) without the boot cap circuit

    Hi, I'm trying to figure out how to use an H-Bridge driver chip without resorting to the boot strap cap method. The FETs themselves are switching a +96V circuit, and what I'd like to do is connect a +108V signal directly to Vboost. Is this possible? What other considerations do I need to make or take into account?
    Thanks, Dan B.

  2. #2

    Infineon Employee
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    tengD is on a distinguished road
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    so yo mean no bootstrap circuit is used in your application, and use a 108V connected to the VB pin, 96V to VS pin. Then please use a capacitor between VB and VS as a filter, the IC will work as expected.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  3. #3
    New Member New Member DanBrunermer is on a distinguished road
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    Boost Circuit

    Hi tengD, thanks for getting back to me. Here is the circuit I have now:

    Click image for larger version

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    I'm going to add an isolated DC-DC converter to the circuit. And if I understand correctly, I should connect it like this?
    Click image for larger version

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    Thanks again! Dan B.

  4. #4

    Infineon Employee
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    tengD is on a distinguished road
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    Hello Dan,

    The AGND should be connected to DGND for this IC. And please add a small capacitor between Vb and Vs as a filter.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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