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UCC28070: Current sensing of UCC28070

chentsu chung
Mastermind 6180 points
Part Number: UCC28070

Hi Sir,

UCC28070 use transformer for current sensing in stead of only a Rsense , what is the purpose ? Or any advantage?

Thank you.

C.T.

  • 0
    TI__Mastermind 34465 points
    The advantages of using a transformer for current sensing are :
    (1) There is no power loss as you would expect with a resistor sense method.
    (2) You can adjust the value of CTA/CTB sensed signal with the transformer turns ratio.
    You can also do this with resistor sensing but you will need a high speed OPAMP.
    (3) You can use the transformer isolation to reduce the effects of common mode noise
    Resistive sensing makes it difficult to isolate the high current ground from the low signal ground.

    Some customers prefer to use resistive sensing and we do have an application note that details how to achieve this.
    Please refer to TIDA-01390 for details.

    Regards
    John