NIS54xxGEVB
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NIS5431 Overvoltage Protection
Connect the eFuse to a variable DC power supply. Place jumpers J2 (10 Ω), J1 (5431), J4, J8, and J13.
Turn the power supply from 3.3 to 10 V to observe the overvoltage protection circuit in operation. The input
voltage will rise, but the output voltage will be maintained at the Vclamp level of about 3.8 V. After conducting 1.1
A with a voltage drop of 6.2 V, the device will reach its thermal shutdown point and latch off. The green indicator
LEDs will turn off and the yellow “fault” indicator LED will be on. An auto-retry eFuse (MT2 part number suffix)
does not latch and automatically cycles the enable pin. For auto-retry eFuses the demo board’s green and yellow
indicator enable pin indicator LEDs will flash as the enable pin cycles between states.
Figure 4: In this test, the input voltage (blue trace) is brought to 10 V. The output voltage (red
trace) is clamped at 3.8 V. After some time the device enters thermal shutdown.
