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UCC28610: Can use for 5W application

Hisao Uchikoshi
Genius 14870 points
Part Number: UCC28610
Other Parts Discussed in Thread: UCC28600, UCC28704

Hi Experts,

We want to use UCC28610 for the peak is 5W. Are there any concerns? Is there any limitation related to min load?

Regards,

Hisao Uchikoshi

  • 0
    TI__Mastermind 40430 points

    Hello Hisao-san,

    Thank you for your interest in the UCC28610 DCM flyback controller.

    Unfortunately, this controller has characteristics that limit its power processing capability to ~12W and higher.  Section 8.1.8 of the datasheet on page 30 discusses this limitation, based on the minimum peak primary current that it can reliably and accurately sense.  Since Idrv,pk must be at least 1A, this would require an inductance of about 94uH to deliver 5W at 133kHz (full load setting) (assuming 80% efficiency).  At high line, then, this low inductance would have an on-time of 250ns which is shorter than the maximum leading edge-blanking time of 450ns.  So output current limit can not be controlled.

    Higher inductance can't be used because the lower peak primary current cannot be accurately sensed.  The UCC28610 controller is not the correct device for a 5-W application. 

    I suggest to consider the UCC28600, instead, or one of the newer UCC287xx controller family; in particular the UCC28704.

    Regards,
    Ulrich