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Part Number: OPA2170
Can OPA2170 short-circuit output current limits be adjusted to custom levels during test process at TI?
In reply to Ron Michallick:
In reply to Dave Knight:
There are a few ways to check stability.
For multiple feedback paths to inverting pin only, I break at inverting input and add C5 (expected input capacitance to ground )
Phase margin is 74 degrees at 210 kHz and gain margin is 43dB at 8.2 MHz
opa2170 bode (gainphase).TSC
Regards,Ronald MichallickLinear Applications
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Here is IOUT vs VOUT. No pnp is white, with PNP is red.
The red slope is a little higher than I expected. Alos input current is -3mA with VOUT at 32V. ~30V/10k = 3mA
Here is V+ vs VOUT
The PNP did not work with the switch open. This make sense because inverting > non-inverting with or without PNP.
So, there is still room for improvement
I increased resistors by 10X and now have better result for gain set to ~2. I added a NPN and diode to get good result for gain set to ~1.
Here is the circuit as tested. (I simplified / modified some components for my testing)
8688.opa2170 analog output(with high voltage input reversal) (2).TSC
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