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Help with Variable Boost Converter selection

Jake Tarren
Prodigy 10 points
Other Parts Discussed in Thread: TPS43000, TPS43060

Hey,

So I'm a little overwhelmed with all of TI's options for boost converters, can you guys please point me in the rite direction please?

I'm going to be giving it 3.0v - 4.2v, and the output should be variable, in increments of .1v, up to 6v.  The battery can support up to 15amps drain, and I'm looking to get somewhere around 40watts consistent output.  I'd like to use a digital pot, but if I need to use something that's set up for an analog one, and convert it, that's not a huge problem.

Ideally, the Boost Converter should have <80% efficiency.

Please let me know if I'm posting this in the wrong place, I don't know the difference between isolated DC/DC converters, and non-isolated ones.

Thanks for the help.

  • 0
    TI__Mastermind 35165 points

    Hi Jake,

    For this much current you will probably need a controller. For the input voltage range, I suggest looking at the TPS43000. I have only seen this used up to 30W (5V @ 6A) and the main limiting factor is the thermal performance of the low-side FET. PMP5417 is a good 20W output example.

    A digital pot in the feedback path can be used to adjust the output voltage. Because this uses voltage mode control, I suggest using the digital pot in place of the bottom feedback resistor.

    You could also look at TPS43060 for a stronger low-side gate driver and using N channel FET as the synchronous rectifier. The challenge with using this is a second voltage needs to be generated to bias the VIN pin due to the 4.5V minimum input voltage of the controller. The input to the inductor can however be the 3.0 V - 4.2 V you need.

    Best Regards,
    Anthony