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CCS: Reducing very light load loss by a UCD3138 controlled PFC

user5316778
Intellectual 340 points
Other Parts Discussed in Thread: UCD3138

Tool/software: Code Composer Studio

1.How many watts does UCD3138 consume?

2.To enhance efficiency of very light load(2~5% load), the power loss of UCD3138 is a keypoint. How can I to reduce the power loss of UCD3138?

3.The output voltage of aux. power is 12V and the used voltage of  UCD3138 is 3.3V. The voltage should be converted from 12V to 3.3V, the linear converter is easy to used but much loss is needed. Can I use the switching power converter to convert the needed voltage?

  • 0
    TI__Genius 14580 points

    Hello,

    1. How many watts does UCD3138 consume? 

    Comments: In program mode, UCD3138 consumes about 0.25W.

    2.To enhance efficiency of very light load(2~5% load), the power loss of UCD3138 is a keypoint. How can I to reduce the power loss of UCD3138?

    Comments: If some of peripherals are not used, you can disable it , then they don't consume power and you can gain efficiency. See the program manual for more details.

    3.The output voltage of aux. power is 12V and the used voltage of  UCD3138 is 3.3V. The voltage should be converted from 12V to 3.3V, the linear converter is easy to used but much loss is needed. Can I use the switching power converter to convert the needed voltage?

    Comments: Yes, using a  buck regulator to change 12V to 3.3V is a good way to go.

  • 0 in reply to Sean Xu
    Intellectual 340 points

    2.To enhance efficiency of very light load(2~5% load), the power loss of UCD3138 is a keypoint. How can I to reduce the power loss of UCD3138?

    Comments: If some of peripherals are not used, you can disable it , then they don't consume power and you can gain efficiency. See the program manual for more details.

    Question: How can I disable some of peripherals, can you provide some examples?