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Hello,
I am working with the OPA1662 and would like to clarify something in the datasheet. When one looks at the short circuit current of +/- 50 mA @ +/-15V, the note "One channel at a time" is referenced.
In the dual package, if one has a single op-amp providing a positive current of 40 mA and the other op-amp provides a negative current of 40 mA to the same load, from the same dual package - would one be in violation of this single channel note? Or does the fact that the currents are symmetrical and of opposite polarity somehow keep one from violating this specification?
To me, I would assume both rails are pulling power, and it would indeed be in violation.
Thank you,
Nick
Hi Nick,
There isn't an issue operating both channels simultaneously. One thing to consider when you are sourcing or sinking currents from any op amp is power dissipation and thermals. We have a section on Power and Temperature in our Ti Precision Labs video training that can be found here:
https://www.ti.com/video/series/precision-labs/ti-precision-labs-op-amps.html
We specify our devices using 1 channel at a time in order to not conflate errors. That being said if you need more output current drive you may consider a device such as the OPA1622.
Below you can see that the OPA1622 provides over 100 mA at T = 125C. This provides headroom for your 40 mA required for both channels and thermals.
Other candidates could be one of the following I included the output current. Here is the filtered list link:
One other option is to design using a parallel amplifier configuration as shown in this app brief.
I hope this information is helpful.
Best Regards,
Chris Featherstone
