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UCC21540: Driving dual channel gate drive IC in a two independent high side mode

Andy Fischer
Prodigy 60 points
Part Number: UCC21540

Hi

I would like to use the UCC21540DWK driving two independent circuits in high side mode.

Could you please help me with the circuit ? I guess on the Input-side its all clear (for example DT connected to VCCI) But on the output side Iam not sure about the circuit.

Thank you in advance

Best regards Andy

  • 0
    TI__Expert 3355 points

    Hi Andy,

    Thank you for your question. I work on the applications team in the high power drivers group.

    Can you provide your current schematic? What is the topology? How do you plan to power CHA and CHB?

    You’re correct that DT pin tied to VCCI is the primary concern. Other than that, CHA and CHB are functionally isolated from each other and can operate independently. The main concern is making sure they have steady power supplies. For a dual high-side driver, it will probably be a bit difficult to use a bootstrap supply. I might recommend using some kind of charge pump or isolated supply to provide bias to the drivers.

    If this helped answer your question, could you please press the green button? If not, feel free to ask more questions.

    Thanks and best regards,

    John

  • 0 in reply to John Geiger
    Prodigy 60 points

    above is the schematic I refer to. the 12V comes from a TRACO Power Supply AC/DC Converter with 310mA peak. I guess its not as easy as I draw it, right ? what did I miss ? Thank you for the help  
    Best regards
    Andy

  • 0 in reply to Andy Fischer
    TI__Expert 3355 points

    Hi Andy,

    You will need individual isolated supplies for each channel, since they need to be referenced to the source of the high-side FET. The source of the high-side FET will go between VBus and Vload, depending on if the FET is on or off. I recommend looking into the reference design linked below for proper isolated supply practices.

    http://www.ti.com/tool/TIDA-01159

    You will need separate supplies since you can not reference the source of each high-side FET to each other.

    If this helped answer your question, could you please press the green button? If not, feel free to ask more questions.

    Thanks and best regards,

    John