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Hi,
We have a question about LPV812 Op-amp oscillation from our customer.
■Question
We are trying to build the following circuit using an LPV812.
This application need to operate it with low power consumption for battery operation.
But the output of LPV812 oscillates on our prototype board.
Could you please let us know why would this circuit oscillate?
And what could be the solution to avoid the oscillation?
Actually this Oscillation can be suppressed by adding an additional circuit,
but that requires additional cost. So we want to make sure it works properly with this schematic.
Meanwhile we tried to replace this Op-Amp with another manufacturer's amplifier,
and it does not oscillate even without an additional circuit.
■Customer’s schematic diagram
Best regards,
Seishin
Seishin
There’s a nice little write up in back of the datasheet for explaining why the amplifier can oscillate when driving capacitive loads. In order to improve your circuit performance remove the 100k resistor and replace with a short. Next change your 100 ohm resistor to something greater than 10k ohms. Something between 10k and 50k should allow you to drive anybload you want. The optional components you have shaded should not be needed.
In reference to other parts not oscillating, I am not surprised if these amps have higher quiescent current. Cap load drive capability is a trade off for lower power consumption. But adding one resistor should solve that problem for you.
Chuck