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TPS2546: Customer need to thermally test his design, wants to statically set up the USB port such that it is drawing max current

Jeff Coletti
Expert 8755 points
Part Number: TPS2546

Hi Support team

I have a customer who needs to do some thermal testing on his final design. is there a way to set the device up such that it supplies a full 2.4A.

He has CTL1&2 tied low, CTL & ILIM_SEL tied High.  If he puts a resistor out there 5/2.4= ~2.1 ohm will the device source teh current or do we need to bias the D+/D- lines and if so how. Or do we need to progress thru the states to be able to draw the full current?

Thanks

Regards

Jeff

  • 0
    TI__Mastermind 30000 points
    Hi Jeff,

    Thanks for posting your question here on E2E. This is a good question. If your customer has an electronic load available, they can use that to draw the 2.4A that they are looking for. You do not need to do anything with the D+/D- lines. Just set the device in the state that you are wanting (CTL1&2 tied low, CTL3 & ILIM_SEL tied High), connect the positive end of the electronic load to VBUS and the negative to ground, set the electronic load to draw 1A, and slowly ramp up to the 2.4A load. The device should be able to handle the 2.4A if you cannot slowly ramp up the load, but ramping up would be better for your tests.