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YZhan.7
YZhan.7
Associate
Feb 11, 2022 9:14 AM UTC
Question

The impedance of LD39050PU33R from OUT to GND.

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
    Feb 11, 2022 9:30 AM UTC

    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
    Feb 14, 2022 1:24 AM UTC

    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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