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UC28023: UC28023 vs UC28025

Jonas Aaslund
Prodigy 30 points
Part Number: UC28023
Other Parts Discussed in Thread: UC28025,

Hi

We use UC28025 today and are looking at the UC28023 and have two questions. One about pin 11 on the UC28023 and one about setting max duty cycle for the UC28023.

  1. Is pin 11 on UC28023 optional to use? If not used will the ILIM be the same for UC28023 and UC28025? Can it be left unconnected? Looking at "8.2 Functional block diagram" in the datasheet the UC28025 has a 1 volt reference and the UC28023 seems to not have this (if not connected externally). So one could think that a 1 volt external reference is needed when using the UC28023 instead of the UC28025.
  2. Is it possible to limit the duty cycle as low as 50% on the UC28023?

Best regards
Jonas

  • +1
    TI__Genius 13660 points

    Hi Jonas,

    1, Pin 11 must be configured in UC28023, while in UC28025, it can be floated, since UC28025 has an internal 1V reference.

       please note that UC28023 is not pin to pin compatible to UC28025,  UCC28025 is dual output, UC28023 is single ended output.  

    2, No, the maximum duty cycle can be set by choosing the right CT and RT, please refer figure 1, figure 19,and figure 20.,  but by this way, the maximum duty cycle can't be too low. 

    besides, the maximum duty can also be clamped roughly by Pin 11 reference in UC28023.

    regards,

    Teng