• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 47 subscribers
  • Views 164 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.

OPA4340: output issue

Stone Zeng
Prodigy 730 points
Part Number: OPA4340


Tool/software:

Hi Team,

my customer is using OPA4340 as below circuit, the vcc supply of OPA4340 is 5V, the output load  is 0.6uF+660R, normally the output (VCC_3.3V_REF3) is 3.3V, but some time they get 1.65V output, could you help check and advise? 

  • +1
    TI__Mastermind 26460 points

    Stone

    Thanks for your post.  Looks like the output is unstable.  If you are extremely unstable, a DVM would measure half supply (1.65V) at the output since the output is constantly toggling between 3.3V and 0V.  Please checkout our TI Precision Labs training session on stability and try using our Analog Engineers Calculator which will help you analyze your circuit for phase margin.  We recommend 45 degrees for stability of your circuit over PVT.

    Chuck