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TPS92611-Q1: EMI On Fault Pin

Cameron Perl
Expert 5375 points
Part Number: TPS92611-Q1

Hey team,

I had a customer looking in to using this LED driver in an automotive application and was wondering if they should have an external pull-up on the fault pin vs the weak internal one to help combat EMI.

What are your thoughts on this matter?

Thanks!

Cameron 

  • 0
    TI__Genius 15776 points

    Could you describe more detail about customer's application.

    EVM is only used for function validation. 

  • 0 in reply to Frank Qiu
    TI__Expert 5375 points

    Hey Frank,

    Thanks for your reply - I'm not sure where the EVM is coming up as this is part of the internals of the TPS device unless I'm mistaken.

    The customer is placing this part in an automotive solution, specifically an e-shift application. They're worried that due to the high EM environment there will be EMI that could influence the FAULT line seeing as I_Fault_pullup is a max of 25uA. They were curious if we would suggest adding an external pull-up so that the threshold was higher. So basically I'm asking if any other customers (specifically automotive) have done this / if this would be needed. 

  • 0 in reply to Cameron Perl
    TI__Genius 15776 points

    Hi Cameron,

    If customer care about the pull up current of fault pin, i suggest they externally pull up fault pin with a 20k resistor to supply for enhencing the pull up ability and that wouldn't make the threshold higher.