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UCC256303: Without VCR pin

Kaori Sekine
Prodigy 10 points
Part Number: UCC256303
Other Parts Discussed in Thread: UCC25600

Hello,
I hope you can help me. 

I would like to use UCC256303 without VCR pin.

Please let me know how to use this IC without VCR pin.

The reason is I would like to use this IC within the full bridge circuit.

And are there any problems without VCR pin?

I appreciate if you will answer the question.

Best regards, Kaori 

  • 0
    TI__Genius 16155 points

    Hi Kaori,

    VCR is the main control signal that is needed for running LLC in closed loop control. Only way without using the VCR signal would be running the LLC in open loop where you dont need to sense the resonant capacitor voltage. So, you want to run the controller in open loop mode?

    Also for driving full bridge,  you need to translate the HO gate signal of the controller to a ground referenced signal in order to drive the low side of the other half bridge.

    Another option would be using UCC25600 for full bridge LLC.

    Regards

    Manikanta P