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TPS2HB35-Q1: Two channel use as one output

Frank QIN
Expert 6555 points
Part Number: TPS2HB35-Q1
Other Parts Discussed in Thread: TPS1HB16-Q1

Hi Team,

We are considering if we can apply TPS2HB35's dual channels as a single channel? Would that be workable theoretically? Anything we need to pay attention when we design?

Thanks!

Best,

Frank

  • 0
    TI__Mastermind 32650 points

    Hi Frank,

    Can the customer use TPS1HB16-Q1 instead? It is possible to parallel the channel but there are more design challenges such as accounting for the channel to channel variation and current splitting between the two channels. The sense measurement is also only for one channel and based on the split may add inaccuracy and would have to be doubled. Also the current limit is per channel current limit and therefore would have to be designed to half the total limit value.

    One major concern is the Vds clamp. During turn off, it is likely that one channels clamp will trigger before the other thereby resulting in one channel demagnetizing the entire inductive energy. This might lead to situations where the channel can be damaged due to the high inductance of the load.

    Therefore, it is possible to parallel two channels to drive one load. Care has to be taken in the design phase but the recommendation is that if possible, it is always better to switch to a lower Ron option especially as they are P2P.

    Thanks,

    Shreyas