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TPS92692-Q1: Problems with not using PNP shift in boost-to-battery

Kevin Schmidgall
Expert 3870 points
Part Number: TPS92692-Q1

Hello,

What are the main issues or problems that could come with not using the PNP shift on the OV pin in boost-to-battery circuit? I understand that the OV pin wouldn't be measuring "true Vout", rather Vout + Vin, but couldn't you just shift your OV/UV range by Vin in some fashion to make it work?

Just wanted to see what problems may arise.

Regards,

Kevin

  • 0
    TI__Mastermind 28655 points
    Hi Kevin,

    If your input is constant it should be as accurate as the PNP shift circuit. Most of the application using this are automotive which can have a very large input voltage range. You also will lose the output under voltage protection.

    As for shifting the voltage, why would you add more components to do this than one PNP transistor that will be more accurate and allow for variable input voltage? OVP requires two resistors, this only adds one PNP.

    Regards,
  • 0 in reply to Irwin Nederbragt
    TI__Expert 3870 points
    Thanks for the quick reply!

    Just a question I've gotten from a customer. It may just be one more PNP but that's space and cost, regardless. I think they're just exploring all options to make sure they only add what they need.