Other Parts Discussed in Thread: LM358
Tool/software:
Hello,
We designed a low noise power supply using the LM358BAIDR in the error amplifier stage with type-2 compensation. We have a very tight specification for the load regulation which is about 0.001%. During our initial proto build, we have better results and units passing within the specification. We did another batch where all the units are failing for load regulation with 2X-3X the spec. We started swapping the critical components in the circuit and when we replaced LM358 from the good units to the bad units, those failing units passed load regulation, and we concluded that LM358 might be the issue. The specs are not great for LM358BA, but for some reason some unknown parameter made the load regulation results look good. We tried with other op-amps, and nothing seems to be working like LM358BA. We tried to increase the DC gain but there is a limitation somewhere in the feedback. At this point we are unsure which parameter to tweak to replicate a consistently good result. Can you help us understand which parameters play a big factor for the issues we are going through?
If you need more information, please let us know.
