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UCC28070: Adopt Current Sense Resistor instead of CT.

Martin Chien
Expert 3590 points
Part Number: UCC28070
Other Parts Discussed in Thread: UCC28180

Hello John,

I don’t understand why I can’t have further question? Every single posted can get only one time reply?

My question is really simple, can we place RC filter to reduce the switching noise? have you ever try that? how's the performance looks like? OPAMP needs more space and cost is not preferred.

Please give me your comment about that.

Very appreciate.

Martin

  • 0
    TI__Mastermind 31580 points
    Hi Martin,

    The challenge with using a low ohmic value current sense resistor with the UCC28070 is that the voltage sensed will be too low and the signal to noise ratio will be low which will impact the PF and THD of the PFC stage.

    The addition of an RC filter on the CS signal will bring little benefit if the CS signal is of low amplitude to begin with.

    We recognize that Op-Amp is a more expensive solution but it is required to maintain the PF and THD performance. The UCC28070 is targeted at high power applications where performance is key.

    The UCC28180 is an alternative option that is designed to work from a low ohmic current sense resistor.

    Regards

    Peter
  • 0 in reply to Peter Meaney
    TI__Mastermind 31580 points
    Hi Martin,

    If you have no further questions I am going to close this thread. Please press the resolves button if I answered your questions.

    Regards

    Peter