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TPS2595: eFuse as LED driver

David Dean
Expert 2315 points
Part Number: TPS2595

Is it possible (or safe or recommended) to use the TPS2595 as a linear LED driver?  I am thinking that I would set ILIM to my desired LED current and, when the TPS2595 is enabled, it will stay in current limiting mode as long as it does not hit the thermal threshold.  Since TPS2595 will regulate the current indefinitely, rather than latching off or retrying like some other eFuses, this seems like a possibility.

I know that there are dedicated linear LED drivers, but the TPS2595 seems to have more features and a smaller package than most LED drivers.  I also have the requirements of:

 - High side drive

 - No external current-sense resistor.

  • 0
    TI__Guru** 105361 points

    Hi David,

    Yes, it should be possible. The device stays in current limit as long as it does not hit thermal protection limit.

    Can you share details of input supply range, LED string voltage tolerance and LED current.

    Best Regards, Rakesh

  • 0 in reply to Rakesh
    Expert 2315 points

    Input = 9V max

    LED string voltage = 6 - 6.5V

    Actually, LED current brings up a potential issue with using an eFuse.  The max current is about 300mA, but I want to be able to control the average current with a PWM signal.  So, I could set the TPS2595 to 500mA and use a 60% max duty cycle.  But I am not sure if the eFuse will be able to turn on/off fast enough to do this effectively.

  • 0 in reply to David Dean
    TI__Guru** 105361 points

    Hi David,

    Thanks for the details.

    These devices are slow turn-on devices to control inrush currents. Switching frequencies in the order of 1kHz is possible.

    Best Regards, Rakesh