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TPS1HC100-Q1: Rgnd+ Diode vs battery block diode

Imelda Zhang
Expert 4385 points
Part Number: TPS1HC100-Q1

Hi Expert,

My customer is using the TPS1HC100-Q1 in their project. What's more, there is an block diode connected to battery. You can see the block diagram below. What's more, the load is inductive.

Should we still need the Rgnd+Doide as below?

From my perspective, for inductive load, we still need the Rgnd+diode even though we have the Battery block diode.

When we disconnect the inductive load, the output voltage will go negative which may damage the device. We have the Vclamp. What's more, we need the Rgnd to get coneected to GND and a diode to keep the GND voltage.

  • Do we need the Rgnd+ diode when there is an block diode on battery? Why?

Thanks a lot for your strong help!

Kind Regards

Imelda

  • 0
    Prodigy 40 points

    why I think not needed is that I think the R_GND and diode is to protection the reverse battery, not the inductor load. 

    since we have the reserve diode in input power line, so it is no needed to use the  R_GND and diode, and also OK for inductor load.

  • 0
    TI__Mastermind 32650 points

    Hi Imelda,

    If the upstream diode is used, there is no need for a GND network. The GND network is to be used only in the instance the upstream diode cannot be used due to thermal considerations.

    When using Method 1 there is no concern even if the load is inductive in nature.

    Thanks,

    Shreyas