OP Amp Power requirements

Discussion in 'Power Electronics' started by Dean Rantala, Dec 13, 2018.

  1. Dean Rantala

    Thread Starter New Member

    Sep 27, 2018
    27
    2
    A quick question regarding OP amp power supplies.

    Take for example - my NE5532's.. Datasheet says +/- 22 volts. What I am trying to understand is...

    Does this mean max voltage difference BETWEEN the + and - inputs is 22 volts?
    -or-
    Does this mean I can have a -22 volts AND +22 volts (relative to ground) for a potential (between +/-) of 44 volts?

    I have always been confused by this..
     
  2. ericgibbs

    Moderator

    Jan 29, 2010
    8,140
    1,647
    hi Dean,
    This is a clip from my NE5532 d/s
    E
    AA1 13-Dec-18 17.59.gif
     
  3. danadak

    Distinguished Member

    Mar 10, 2018
    3,220
    720
    +/- 22 is the absolute max power supply can be on the
    power pins.

    + and -, non inverting and inverting inputs, the allowed CM range here in datasheet.
    Note its for +/- 15V supplies.

    upload_2018-12-13_13-0-36.png


    Regards, Dana.
     
  4. OBW0549

    Distinguished Member

    Mar 2, 2015
    2,901
    2,665
    No.

    Yes.

    Keep in mind these are the Absolute Maximum Ratings of the part, NOT the recommended operating conditions. Running electronic devices at or above their Absolute Maximum Ratings is roughly equivalent to driving your car with the tachometer constantly at the red line.

    Don't do it.
     
    Dean Rantala likes this.
  5. Dean Rantala

    Thread Starter New Member

    Sep 27, 2018
    27
    2
    Okay... so, let me be sure I understand this correctly...

    This means that - in my case - the max power supply would be something like this:

    (+11)===(Ground)===(-11)

    The + and - connected to the OP amp is 22 volts total... So the above would be correct?

    I ask because I have a power supply as follows:

    (+16)===(Ground)===(-16)

    This would mean a POTENTIAL DIFFERENCE of 32 volts... Meaning I would be over-powering the amp... correct?
     
  6. Dean Rantala

    Thread Starter New Member

    Sep 27, 2018
    27
    2
    Thank you, OBW0549. That is what I was getting at.

    So my +/- 16 volt (32 volts between the -/+) is perfect.
     
  7. OBW0549

    Distinguished Member

    Mar 2, 2015
    2,901
    2,665
    No. Read what I wrote above, CAREFULLY.

    No.
     
  8. OBW0549

    Distinguished Member

    Mar 2, 2015
    2,901
    2,665
    Yes.
     
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