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Original question:

UCC28180: UCC28180 Burst Mode

UCC28180: Threshold at which the device will start (Pseudo) "Burst Mode"

UA&A_CodyDowling
Expert 1006 points
Part Number: UCC28180

TI Team, 

Other e2e forum entries indicate that the "burst mode" touted by the bullet on the front page of the data sheet is really just a function of the controller calling for a 0% duty cycle under "extreme light loads". Can you provide some insight as to how much power constitutes "extreme light loads"? How can we predict the point at which the controller will slip into psuedo-burst mode? Is it just when the converter enters discontinuous conduction mode switching?

Thanks,

Cody

  • 0
    TI__Guru 50090 points

    Hi Cody,

    When the load current is low such that the voltage on the ICOMP pin falls below 0.2V, the device stops switching as described below:

    The ICOMP voltage is proportional to the average inductor current seen by ISENSE so the threshold will really depend on how you set RISENSE. 

    So to answer your question, yes this will happen whenever the converter enters into DCM.

    I hope this helps.