• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 47 subscribers
  • Views 308 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.

OPA2376: Application issues of chips

Tonyx.wu
Genius 4225 points
Part Number: OPA2376


May I ask if I use the OPA2376 operational amplifier and connect it to a follower for use, and expect to output 1V? Why does the voltage value measured when the output terminal is connected to a 0 ohm resistor cause oscillation? Switching to 1 ohm output will be normal


The actual input of 0V5 in the diagram is 1V



When applying a 0 ohm resistor, the output measured is 1.9 and negative 0.8

  • 0
    TI__Guru 68931 points

    Tonyx,

    The oscillation is caused by 1uF output capacitors, which together with OPA2376 output impedance form a pole within effective bandwidth of Vou/Vin transfer function causing a large phase shift.  In order to assure stable operation across process/temperature variations, please add 25 ohm R115/R116 in series with output caps or remove 1uF C185 and C187.

  • 0 in reply to Marek Lis
    TI__Guru 68931 points

    Since it's been a week since your last response, I will close his inquiry.  If you have further questions, please reply or start a new thread..