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Original question:

TIDA-01081: Performance Characteristics

TIDA-01081: Is 42V possible?

Fran Shaw
Prodigy 60 points
Part Number: TIDA-01081
Other Parts Discussed in Thread: TPS92515HV

Tool/software:

I am very interested in driving this reference design LED string voltage at 42V. Is this possible?

  • 0
    Prodigy 60 points

    Hello. The TIDA-01081 rating = 24V, 2.4A.

    Ideally, I wish to use one TIDA-01081 board to drive two 42V, 1.2A LED panels. I think this is = 42V at 2.4A?

    Alternately, I could use just one 42V, 1.2A  LED panel.

    But, the LED driver (TPS92515HV ) is rated up to 65V, and two LED panels would be fantastic!

    So, is it possible to change or add components and keep the circuit largely unchanged?

    Much appreciate any insight! V

  • 0
    TI__Prodigy 610 points

    Hi Fran,
    thanks for you interest in this reference design. I'll need to have a review of the documentation and will provide an answer tomorrow.

    Best Regards

    Bert

  • 0 in reply to Fran Shaw
    TI__Prodigy 610 points

    Hi Fran,
    thanks for you interest in this reference design. I'll need to have a review of the documentation and will provide an answer tomorrow.

    Best Regards

    Bert

  • 0 in reply to BertW
    Prodigy 60 points

    Terrific! Very pleased to learn. Your TIDA-01081 tech articles have helped my understanding to a great degree!

  • 0 in reply to Fran Shaw
    TI__Prodigy 610 points

    Hi Fran,
    The major component for controlling the LED current value is the TPS92515HV which is rated for a max recommended and absolute max  VIN of 65V . I would preferer to stay slightly below this max value ...
    The TIDA-01081 uses for the TPS92515HV a max VIN of 49V for electrical safety purposes (during testing in the lab) - can therefore be increased in a real customer application with a customized design. The LED string voltage can also be increased to 48V, provided that the VIN of the TPS92515HV is larger than the string voltage and that the design is customized to it. It is basically the difference between this VIN and the LED string voltage which drives how fast the inductor (L1) current can rise - please see fig 27 and table 8 in the user guide . However: all such changes will have consequences on a lot of different circuit blocks and subfunctions in the circuit. All the circuit blocks needs to be carefully checked and if needed customized for the higher voltage levels. There are overvoltage protections implemented in many of the circuit blocks, which would otherwise be triggered - in hardware, but also in the software of the MCU. Not to forget: Beside the voltage limitations there are also power limitations (voltage depended current limits) in hardware and software implemented (examples for that are  Common Power and the Pre-Boost circuit blocks).

  • +1 in reply to BertW
    Prodigy 60 points

    Excellent reply, thank you for the very helpful insight.

    Knowing that the TPS92515HV and the LED string voltage handle up to 48V is a big help. And great suggestions of other areas to adjust. To start testing, I'll likely short half my LED board and alter it to 21V 2.4A. Then start customizing!