AD8054 Voltage Stabiliser application

Hi,

I have a customer using the AD8054 in a voltage stabiliser application.  It is configured as a voltage follower :-

0-5V on the +ve pin.  -ve pin connected to the output.  On the output he has two series resistors 5Kohm and 10Kohm to get 3.3V at the divider.

He is seeing a wide variation on the output voltage of the Op Amp with some devices outputting 4.39V.  Other devices, deemed "good" see 4.98V.

Is this variation at the output of the OpAmp normal ?

Any comments/suggestions welcome.

Thanks

Andy

  • 0
    •  Analog Employees 
    on Oct 15, 2014 5:19 PM

    Hi Andy,

    The AD8054 is specified to operate on +3 V, +5 V or +5 V supplies. It has an input voltage range capability of 200 mV headroom below the negative supply rail and 1 V headroom below the positive supply rail. With his application, an input (0-5V) is beyond the input voltage range with the specified supplies. If you go beyond this range the amplifier will not be able operate properly, it is why you are seeing different outputs in your evaluation.

    Below are the specified range of input voltage with the respective supply.

    You can refer to Selection Table for All Op Amps for more amplifiers that will suit best on your application.

    Best Regards,

    Jino

  • 0
    •  Analog Employees 
    on Oct 15, 2014 9:44 PM

    Hi Andy,

    Thank you for your inquiry. You have asked your question in the Help space for learning how to use EngineerZone. For product support please ask questions in the applicable Product community. A list of communities with links is available on the home screen of EngineerZone.

    I am moving your question to the Operational Amplifiers community for assistance.

    Regards,

    Lisa

  • 0
    •  Analog Employees 
    on Oct 18, 2014 6:47 AM

    Hi Andy,

    If he would go for a replacement part, I would suggest AD8040. It is a quad, rail-to-rail input and output high speed amplifier with an input voltage range of extending 200 mV beyond each supply rail having no phase reversal.

    For its  + 5 V supply performance see below.

    AD8040 can operate on 2.7 to 12 V supplies with a bandwidth of 120 MHz.

  • 0
    •  Analog Employees 
    on Aug 2, 2018 2:47 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin