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TPS92515AHV-Q1: Bypass UVLO mode

Lindsey Fike
Intellectual 2250 points
Part Number: TPS92515AHV-Q1

Hello!

Posting for a customer- 

They are using multiple TPS92515As controlling LED strings arranged in a grid. There use case/system sometimes causes a small voltage in adjacent TPS92515A devices and they go into UVLO mode because it detects a non-0V voltage on the Boot pin  that is too low for operation. Is there a way to bypass the UVLO functionality? 

Thanks!

  • 0
    TI__Mastermind 28655 points

    Hello Lindsey,

    There are three UVLOs on the TPS92515a.  The internal VCC UVLO, the Boot UVLO and the UVLO that can be set on the PWM/UVLO (Enable).

    Which UVLO is this?  If Boot voltage is less than 2.8V typical it will trip the Boot UVLO which causes it to pull the SW node down to refresh at 5 mA typical.  If the SW is held up it cannot refresh.  I'd like to get more information on what exactly they are doing and what problem they are seeing.

    "8.3.11.3 UVLO: VIN, VCC and BOOT UVLO
    The TPS92515AHV-Q1 contains 3 internal under voltage lock-outs which must be satisfied for the device to
    operate: VIN UVLO ensures adequate voltage to power the high-side comparator. VCC UVLO ensures internal
    rails are adequate for the device to function, and BOOT UVLO ensures proper high-side FET operation and
    smooth dropout operation. All of the UVLO's operate independently and automatically. Under normal operation
    they do not require any specific user attention."

    Best Regards,

  • 0 in reply to Irwin Nederbragt
    TI__Mastermind 28655 points

    Hello Lindsey,

    This has been moved to email so I'm closing this thread.

    Best Regards,