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YZhan.7
YZhan.7
Associate
February 11, 2022
Question

The impedance of LD39050PU33R from OUT to GND.

  • February 11, 2022
  • 2 replies
  • 1378 views

0693W00000JPQQ6QAP.pngHi, everyone

I want to know the value of R1 and R2. It is LD39050PU33R, and the fixed output is 3.3V. I didn't find them in the datasheet. Please help.

Best Regards

    This topic has been closed for replies.

    2 replies

    Peter BENSCH
    Peter BENSCH
    ST Technical Moderator
    February 11, 2022

    For the voltage regulation of the LDO, a voltage divider with a fixed resistance ratio is necessary, which is already included in the Fixed version.

    What do you need the resistor value for, which must be very large because of the low quiescent current?

    Regards

    /Peter

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    YZhan.7
    YZhan.7Author
    Associate
    February 14, 2022

    Thanks for your anwser. In the fixed version, the value of R1 and R2 is fixed. And I want to know the exact value of resistance to calculate the impact of LDO access on the impedance my circuit.

    Regards

    Zhang

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