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UCC28070 Current Sense Offset and PWM Ramp

Hiroshi Doi35
Expert 2845 points
Other Parts Discussed in Thread: UCC28070

Hello, all

Now we have one inquiry regarding.

UCC28070  specsheet p36  Current Sense Offset and PWM Ramp.

If this circuit added, is there no influence for efficiency,harmonic,noise and so on?

Are there any check point?

Best regards, 

H.DOI

  • 0
    TI__Mastermind 34465 points
    The circuit that you refer to is used to add a PWM ramp with a DC offset to the current sense circuit at light loads where the inductor current becomes discontinuous.
    Page 8 of this document explains
    www.ti.com/.../slua479b.pdf
    Because it improves the input current wave shape it will also improve the harmonics and power factor.
    It also should improve the efficiency slightly.

    Regards,
    John Griffin