INA213-Q1: TRANSIENT - PULSES in the Input supply of the Amplifier_Is it damage the Opamp

Hey Selva,

Thanks for posting on the forum.

• Is the voltage transient location occurring at VIGN or at SW_VIGN_FUEL?

• Would you help me understand what the voltage will be at IN+/IN- pins of INA213 when the transient pulse is at its peak?

If the common-mode voltage (VCM) at IN+ and IN- pins is >26V or <-0.3V and this occurs for more than hundreds of nanoseconds, then you need to clamp the voltage at input pins (IN+/IN-). This technique is shown in Figures 27 and 28 of datasheet:

If you need to protect against negative VCM voltages for VCM<-0.3V, then you will need additional TVS diodes clamped to supply voltage. Consider reading these FAQ posts for more information:

If at some point you need to increase the current-limiting resistor (Rprotect in the datasheet Figures 27 and 28) from 10-Ohms, but don't want to decrease accuracy, then please consider using the INA190 or INA186. These devices have higher input impedance and thus can handle higher Rprotect resistor values (up to 1kOhm). Increasing Rprotect allows for use of lower power clamping diodes.

Please post back with your questions.

Sincerely,

Peter Iliya

Hi Peter,

 Thanks for the immediate response.

1. The transient Pulses feed at VIGN supply. SW_VIGN_FUEL supply is generated from the VIGN supply only. (Using transistors voltage limit circuit was designed.)

2. As per the transient pulses ~40V will be comes in the +Ve and -Ve pin of the amplifier at positive transients.

3. At negative transient pulses ~ 200V will be comes  in the +Ve and -Ve pin of the amplifier.

4. Can you please suggest the TVS with low leakage part to withstand around +/-300V.