OPA4191IPWR datasheet(30/65 Pages) TI2

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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).

OPA191, OPA2191, OPA4191

SBOS701D – DECEMBER 2015 – REVISED AUGUST 2021

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OPA4191IPWR Datasheet(PDF) 30 Page - Texas Instruments