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OPA551: [OPA551UA] How to handle flag pins

MJ Jeon
Genius 5240 points
Part Number: OPA551

Hi, TI Support Team

Please inquire about the flag pin processing method.

Is there any problem in operation even if the flag pin (8th) is directly connected to GND?

When connecting directly to GND, is there any possibility of any problem in operation?

Datasheet is designed to be optional and pull-down.

Thanks.

Regards,

MJ

  • 0
    TI__Guru* 93105 points

    Hello MJ,

    The OPA551 thermal flag has a wide Voltage Compliance Range extending from V– to (V+) – 1.5 V. Therefore, if the OPA551 is applied in a single power supply arrangement such as single +60 V or other within its specified range, the flag can be referenced to the 0 V GND and function correctly. There shouldn't be any operational issue connecting it in this manner.

    The Feature Description in datasheet section 7.3.4, Thermal Protection, paragraph 3, provides a good description of the thermal shutdown function and electrical characteristics.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    Genius 5240 points

    Hi, Thomas

    Thank you for reply.

    Is there any problem in operation even if the flag pin is NC processed (not connected)?

    Thanks.

    Regards,

    MJ

  • 0 in reply to MJ Jeon
    TI__Guru* 93105 points

    Hi MJ,

    The OPA551 data sheet in the Application Information Section 8.2, shows Figure 27 "Typical Application, Basic Circuit Connections." In that circuit, the Flag pin has the flag current return resistor labeled "optional." That indicates that the pin can be be an NC pin and float. 

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    TI__Guru* 93105 points

    Hello MJ,

    Unless you have any additional questions please close this e2e inquiry.

    Regards, Thomas

    Precision Amplifiers Applications Engineering