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UCC25800-Q1: Power management - INTERNAL forum

Elon Zhu
Prodigy 20 points
Part Number: UCC25800-Q1

Tool/software:

Hi~ team:

       When our customer was testing the DEMO, it was found that when VIN_12_MUX is different, the +15V_HOT_HS_I is not a fixed value, and at low voltage (9V), the output (VDD_HS) is less than the expected value of 15V.

       What is the reason for this phenomenon?

  • 0
    TI__Guru 54105 points

    Hi,

    This IC is operated in open-loop so its output voltage is proportional to its input voltage. There is no closed-loop regulation. So to keep output in regulation, its input voltage needs to keep constant.