Overcurrent protection testing primarily consisted of ensuring that the INA302 responded appropriately to increases in current and for the current sense amplifier to turn off LM74810 if an over-current event occurs. As mentioned in section 2.1.1, the INA302 can operate in latch mode or transparent mode. The testing shown in Figure 3-5 and Figure 3-6 was performed in latch mode.

As shown in Figure 3-5, the red trace is the current output which sees an increase in current from 15A to 50A for 100ms. The overcurrent threshold is at 60A and as such the EN pin stays high in normal transient operation.

As shown in Figure 3-6, the red trace is the current output to the e-load which experiences a 62A transient for 100ms. A 62A transient will trigger the overcurrent protection if the transient last longer than roughly 100µs. The green trace, which is the enable signal, pulls low during the fault conditions and will remain low until the INA302 LATCH pins are toggled to clear the fault. Having the enable signal pulled low, will turn off the MOSFETs, disconnecting the output from the input, resulting in a decrease in output voltage.