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TINA/Spice/OPA551: use the amp with single supply

Di Jiao
Intellectual 815 points
Part Number: OPA551
Other Parts Discussed in Thread: TINA-TI, , OPA547

Tool/software: TINA-TI or Spice Models

Hi,

  I want to use the OPA551 with SINGLE supply. 

 1. the amp circuit works when the amp is powered with +-30V;

2. there is something wrong when the amp is power with single supply.

  here is the TINA simulation file.

8737.OPA551.TSC

  1. Can the opa551 be used with single supply? Is there something wrong with my simulation?

  2. Can you please recommend  an amp with at least 50V output voltage and 200mA current?

  Looking forward to your reply.

  Best regards,

  Di

  • 0
    Guru 140200 points
    Hi Di,

    please have a look into the datsheet: The common mode input voltage must stay 2.5V away from the supply rails. And the output voltage of OPA551 will not reach the supply rails, either.

    Kai
  • 0
    TI__Guru* 93105 points
    Hello Di,

    The OPA551 can be used with a single supply, but you must make sure that the input common-mode voltage range, and voltage output ranges are observed. If violated, the op amp will not be operating with its linear operating range and the results will be distorted and clipped.

    Keep in mind that the supplies instead of being for example +30 V/-30 V for a dual supply, the equivalent single supply will be +60 V/ 0 V. Therefore, with a Common-mode voltage (Vcm) range of (V–) + 2.5 to (V+) – 2.5 V, the Vcm would be +2.5 V to +57.5 V for a single +60 V supply. Similar consideration must be given to the Voltage Output (Vout) range of (V–) + 3 to (V+) – 3 V, for Io = 200 mA. The Vout would be limited to +3 V to +57 V.

    Maybe this blog from TI's "The Signal" will help makes the concepts more clear:

    e2e.ti.com/.../op-amp-voltage-ranges-input-and-output-clearing-some-confusion

    And see this Application Bulletin as well:

    www.ti.com/.../sboa059.pdf

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • 0 in reply to Thomas Kuehl
    Intellectual 815 points
    Hi Thomas,
    thanks for your reply.
    Can you please recommend an amp with single supply that has at least 50V output voltage and 200mA output current?
    I think opa547 can be used for my application.

    Best Regards,
    Di
  • 0 in reply to Di Jiao
    Guru 140200 points

    Hi Di,

    the OPA547 cannot reach 0V at its output either:

    Kai

  • 0 in reply to Di Jiao
    TI__Guru* 93105 points
    Hi Di,

    Kai's points about the OPA547 voltage output limits will not permit its output to swing to 0 V, with a single +50 V supply. You would have to either provide a somewhat negative V- supply such as -3 or -5 V, or limit the lower swing limit to about +2 V above the 0 V ground level. Otherwise, the OPA547 would be a good choice.

    Regards, Thomas
    Precision Amplifiers Applications Engineering