This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS92611-Q1: CC drivers in parallel, clarification on FAULT vs DIAGEN

Part Number: TPS92611-Q1

I am using tps92611 ICs to drive strings of LEDs, is it possible to use two IC outputs in parallel to have double the current/two different brightnesses for the LED strings? Will this require a diode? Will active load sharing be required?

Also, I am not clear on the FAULT vs DIAGEN pins, I want to monitor the output LEDS for open circuit and short circuit using the fault pin, can I leave the DIAGEN alone for this functionality or will I require R1+R2? The datasheet has me confused on the subject, is DIAGEN resistor divider only for more careful monitoring of outputs for FAULT bus?

  • Hi Alexandrov,

    Do you mean connecting the two inputs and outputs together and using the EN pin to realize two different brightnesses? If so, then no diode is needed. But if you use two different inputs, for the unused device, be sure that VOUT must be less than Vin+0.3V.

    For the DIAGEN pin, by connecting from SUPPLY via resistor divider, it is used to disable the open-circuit detection when the input voltage is low and the device works in low dropout mode. When the SUPPLY voltage is higher than the threshold that is set by the resistor divider, open-circuit detection is enabled. For short circuit detection, it is always active.

    Best Regards,
    Shirley He
  • Thank you very much, yes I will be connecting two to the same inputs and two to the same outputs and driving the EN pins to achieve two different brightnesses.

    So I can leave the DIAGEN pin alone if I just need open-circuit and short detection?

  • DIAGEN pin must be tied high to enable the open-circuit detection.