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TPS54160: PFM mode and FPWM mode

Kyle Kim
Prodigy 150 points
Part Number: TPS54160

Tool/software:

Hi team,

nice to meet you Slight smile

I would like to ask a question about PFM and FPWM mode of TPS54160.

For high efficiency at light loads, this device operates in PFM.

Is there a standard for light load here?


That is, if the output current is lower than a certain value, it is judged as light load and changes the operation to PFM mode?

I'm guessing the lower  load current effects COMP's voltage to do something. which is related to reason for changing PFM mode

Could you please explain on this?

I want to understand mechanism for "changes in COMP voltage and internal Mechanism Due to Load current Reduction"

Thank you!

  • 0
    TI__Guru 58171 points

    Hello Kyle

    You can see the difference between PFM and FPWM mode when the output current is less than 1/2 of the inductor peak-to-peak current ripple, but it seems this device doesn't provide FPWM mode. For the high efficiency at light load, the device provides 'pulse skip ECO mode'. Please refer the section 8.3.3 of the datasheet. 

    Current mode controller's COMP pin voltage is proportional with the inductor current. 

    -EL