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UCC28180: ISENSE pin current sense method

Koshi Ninomiya
Expert 4105 points
Part Number: UCC28180

Hi Team,

My customer is going to evaluate UCC28180EVM-573, and is considering current sense method.
Usually, a negative voltage similar to the inductance current (triangular wave overlapped on the sine wave) is applied to the ISENSE pin of the UCC28180 by the current detection resistor.
Is there any problem if a similar negative voltage (rectangular wave with sine wave peak) is applied to the ISENSE pin of the UCC28180?
(It is like a peak current mode operation)
There was no problem in the simulation, but please let us know if that current sense method have any problems.
Thank you.

Best Regards,

Koshi Ninomiya

  • 0
    TI__Mastermind 25570 points

    Hello Koshi-san

    The UCC28180 uses Average Current Mode control instead of Peak Current Mode control. The controller will filter the signal at the ISENSE pin - normally a pole at about 5kHz is used so the controller is not sensitive to the ISENSE signal variations at the switching frequency.

    The signal at the ISENSE pin MUST represent the inductor current otherwise the controller will not be able to control the inductor current to follow the input voltage waveform and you will get a lot of harmonics distortion and poor power factor. Has the customer measured the Power Factor and THD ?.

    Regards

    Colin