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TPS92641 analog and PWM dimming / webench questions

Mark Stowe1
Prodigy 10 points
Other Parts Discussed in Thread: TPS92641EVM, TPS92641

Hi, I want to use a TPS92641 to drive a LED series with maximum 1000mA at 24V, using both analog and SDIM PWM dimming, using a similar schematic to the TPS92641EVM (and the same 48V Vin).  I appreciate any guidance for two questions.

How can I get Webench to use the TPS92641? (or is there a better design tool?) (I have tried).

In Table 1 of the user guide for the EVM it lists a  I LED  of  1000mA and a Vout range of 32-33V.  Is there any reason that it would not drive my LED series at 24V (perhaps with a loss of efficiency - but how drastic)?

Thanks a lot!  Best wishes, Mark

  • 0
    TI__Expert 5130 points

    Hello Mark,

    1. TPS92641 has not been included in Webench yet. You may calcluate the component values base on the data sheet.
    2. Normally higher output voltage will achieve higher efficiency in buck topology. But the 32-33V output range is just a specific example in EVM user guide as it says ”This voltage is load dependent, the nominal forward voltage drop, VF of the LED used is 3.25V per LED running at 1 A.” So don’t worry, your 24V output LED will be totally fine driven by TPS92641.

    Regards,

    Victor