LM258: output varies with PCB tiny distortion

Gene Qiu

Part Number: LM258

Hi Team

Customer are wondering whether the gain would be influenced when PCB has tiny distortion. The input pin 2,3 voltage keeps same as designed, while output pin1 drifts from designed. so i am trying to find any hints for such abnormal phenonmenon.

over 5 years ago

0 kai klaas69 over 5 years ago

Guru 140200 points

Hi Gene,

what is the issue? That the output of LM258 does not fully go down to 0V?

And please remove C99. It decreases the phase margin and can cause instability.

Kai

0 Ron Michallick over 5 years ago in reply to kai klaas69

TI__Guru**** 174826 points

Hello Gene.

Does "PCB has tiny distortion" refer to physical torque, flexing of the circuit board? Exactly how much does the output change?

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LM258: output varies with PCB tiny distortion