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LM317: On the rise of LM317 and LM337

user5994067
Intellectual 820 points
Part Number: LM317
Other Parts Discussed in Thread: LM337

Hi,

I would like to supply ± 2.5 V from ± 12 V input as a power supply using LM317 and LM337 as pressure sensors.


Attach the wiring diagram.


Please let me know if there is something wrong with the usage.

In particular, the values of the adjustment resistors are given in the respective data sheets of the LM317 and LM337.
We use the recommended values listed, but should we use the same constants?


Also, if the rise of ± 12 V is simultaneous, is it OK to recognize that the rise of ± 2.5 V is also simultaneous?

regards.

LM317_LM337.pdf

  • 0
    TI__Mastermind 23361 points
    Hi

    Please let me know if there is something wrong with the usage.
    --I have checked the schematic, the resistors used for LM317 and LM337 are good based on the calculation provided by the datasheet.

    Also, if the rise of ± 12 V is simultaneous, is it OK to recognize that the rise of ± 2.5 V is also simultaneous?
    --Are you asking if ± 2.5 V will have the same startup time? If this is what your question is. The answer is that it may not be the same.
    1. The current capability will vary even with the same part number.
    2. The capacitors values will also vary even with same rated voltage and labelled capacitor value.
    3. Your layout of the two LDO may have slighly differnet traces and this will cause variation on startup time as well.

    Regards,
    Jason Song