OPA191_017 Datasheet, PDF (30/51 Pages) Texas Instruments – 36-V, Low Power, Precision, CMOS, Rail-to-Rail Input/Output, Low Offset Voltage, Low Input Bias Current Op Amp

OPA191, OPA2191, OPA4191
SBOS701A – DECEMEBER 2015 – REVISED APRIL 2016
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An ESD event is very high voltage for a very short duration (for example, 1 kV for 100 ns); whereas, an EOS
event is lower voltage for a longer duration (for example, 50 V for 100 ms). The ESD diodes are designed for
out-of-circuit ESD protection (that is, during assembly, test, and storage of the device before being soldered to
the PCB). During an ESD event, the ESD signal is passed through the ESD steering diodes to an absorption
circuit labeled ESD power-supply circuit. The ESD absorption circuit clamps the supplies to a safe level.
Although this behavior is necessary for out-of-circuit protection, excessive current and damage is caused if
activated in-circuit. A transient voltage suppressor (TVS) can be used to prevent against damage caused by
turning on the ESD absorption circuit during an in-circuit ESD event. Using the appropriate current limiting
resistors and TVS diodes allows for the use of device ESD diodes to protect against EOS events.
8.3.8 Overload Recovery
Overload recovery is defined as the time required for the op amp output to recover from a saturated state to a
linear state. The output devices of the op amp enter a saturation region when the output voltage exceeds the
rated operating voltage, either due to the high input voltage or the high gain. After the device enters the
saturation region, the charge carriers in the output devices require time to return back to the linear state. After
the charge carriers return back to the linear state, the device begins to slew at the specified slew rate. Thus, the
propagation delay in case of an overload condition is the sum of the overload recovery time and the slew time.
8.4 Device Functional Modes
The OPAx191 has a single functional mode and is operational when the power-supply voltage is greater than
4.5 V (±2.25 V). The maximum power supply voltage for the OPAx191 is 36 V (±18 V).
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