• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 31 subscribers
  • Views 1899 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

opa1632d pin_enable function?

OPA1632: Enable pin operating condition

Brian Han1
Intellectual 530 points

Part Number: OPA1632

Hi, I'm making the circuit for OPA1632 and I want to use the enable pin so that I can power it down when not it use.

But since the enable pin threshold is based on the negative supply, I need to add a transistor or mosfet to use with my MCU GPIO.

Rather, is it possible that I connect the enable pin to ground and enable and disable the negative supply to shutdown the OPA1632?

I'm using +12V and -12V supplies for the OPA1632 and when the device is on, -V is 12V and enable pin is 0V so OPA1632 is enabled.

When -12V is cut off -V is 0V and the enable pin is 0V so the OPA1632 is disabled.

If there is a better way of doing this, could anyone please share?

Thank You

  • 0
    TI__Genius 15605 points

    Hey Brian, 

    I think the device can be used in this way, just a few things to be wary about:

    -Ensure that the negative supply is actually being tied to GND, an open circuit/high impedance output to the supply will cause issues.

    -You will need to be wary of your abs max conditions when disabling the device (being used in single-supply). You shouldn't provide an input outside of the supply range of the device. This means that when the device is disabled, any negative inputs provided to the OPA1632 can damage the device.

    Best,

    Hasan Babiker

  • 0 in reply to Hasan Babiker31
    Intellectual 530 points

    Hello Hasan,

    Thanks for the information.

    I will check for solutions regarding possible issues that might arise with my setup.

    I'm trying to use the least component as possible, but it seems adding a PMOS on the EN pin might be the simplest.

    Regards,

    Brian

  • 0 in reply to Hasan Babiker31
    Intellectual 530 points

    Hello Hasan,

    I decided to add a MOSFETs to control the EN Pin.

    Is the schematic below generally used with OPA1632?

    When GPIO EN is High OPA1632 is enabled.

    When GPIO EN is Low OPA1632 is disabled.

  • 0 in reply to Brian Han1
    TI__Genius 15605 points

    Hello Brian,

    This configuration should work, note you may have to adjust R158 & R159 to achieve desired functionality.

    Best,

    Hasan Babiker