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wide input range single channel white LED string driver

Craig Javid
Prodigy 250 points
Other Parts Discussed in Thread: TPS92692

I need to drive from 10 to 16 white LEDs from a constant current source in the range of 20 to 40mA.  The input voltage range must be 12V to 24V.

I have been searching but have not found a suitable buck/boost driver.  Can anyone suggest a single IC solution for this function?  If not, any other suggestions are appreciated.

Thanks for any help!

  • 0
    TI__Mastermind 28655 points
    Hello,

    Does this need to be a buck-boost or will a boost work. Vout minimum should be around 30V. If you dim the boost may not work. As for a buck boost the TPS92692 should work though the current sense resistor would need to move to the LED- to prevent exceeding the pin ratings. Also if a series P-FET is needed that would have to be level shifted.

    Regards,