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OPA4340: output issue

Stone Zeng
Prodigy 740 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 26720 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