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TPS1H200A-Q1: Parallel operation of TPS high side switches

Robert Valley
Prodigy 50 points
Part Number: TPS1H200A-Q1
Other Parts Discussed in Thread: TPS1H100-Q1, TPS2H160-Q1

I'm currently using the TPS high-side switch to control a 10W (1.667A@ 6V) tungsten lamp, but new requirements of a 20W lamp (3.25A@6V) exceed the current limits of the device.  Can these parts be effectively used in parallel?  I don't find anything in the datasheet to encourage or discourage this practice, and would think that MOS thermal effects would be such that the parts would share current well.  But I question whether the protection circuitry built into the device would detect conflicts during switch-on.  Obviously, the parts would need to be set up identically and switched from the same source, but there may be other issues involved that cause problems.

thanks for your thoughts,

Rob Valley

  • 0
    TI__Genius 12410 points

    Rob,

    I would recommend perhaps the TPS1H100-Q1 that can do 4A.

    If you would like to use them in parallel I would recommend using the TPS2H160-Q1 and paralleling the channels. I believe there will be less miss match between the Ron's that would cause less issue of current sharing.

    We also have this app note

  • 0
    Prodigy 50 points

    Thanks very much for your quick and thoughtful reply.  I'd looked for an app note on the subject, but my searching didn't locate anything of value ,,, I suppose I need to sharpen my search methods.  Anyhow I'll look at your recommendations ... I didn't think there was a higher current version of this part (TPS1H100-Q1) ... and would rather use that then a parallel architecture.  Good day -- Rob