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TPS2490 for Multiple N-MOSFET Drive?

SINOJ SUDHAKARAN
Prodigy 20 points
Other Parts Discussed in Thread: TPS2490

I have to drive multiple N-MOSFETs at high side to switch the load from a battery where current can go up to 100A. I found TPS2490 as a suitable candidate. Can I use one TPS2490 to drive multiple N-MOSFETs (2 nos.)? A possible selection for N-MOSFET shall be IRFB7730PBF (two of these in parallel).

Is there any other solutions for driving multiple (at least 2 nos.) N-MOSFETs at high side with input voltage up to 60V and load current 100A?

Any help is highly appreciated.

  • 0
    Prodigy 20 points

    Alternatively can I use two TPS2490, one for each N-MOSFET (in the case of two MOSFETs in parallel)? We have a separate current and voltage monitoring in the system.

  • 0 in reply to SINOJ SUDHAKARAN
    TI__Expert 5940 points
    Sinoj,

    The TPS2490 can drive multiple FETs. But Vin of 60v, load of 100A is out of reach for any hotswap IC/FET combo. 100A is too much for 2 x IRFB7730 FETs (20W Pdiss) unless they are located on a massive heatsink with forced air cooling. You will have to split the rails up into several lower current rails, likely in the 20-25A range so 4-5 separate HSC designs that are not tied together at a common output. Visit www.ti.com/hotswap and the technical documents tab. The "Robust Hotswap Design" app note is a good reference. A key point is that with parallel FETs, all of the SOA may show up on a single FET.

    Brian