NIS54xxGEVB
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NIS5431 Overcurrent Protection
Continue with jumpers J2 (10 Ω), J1 (5431), J4, J8, and J13. With VCC set to 3.3 V, press the large green
button to short circuit the output. A power supply capable of supplying more than 3 A is recommended. The
mechanical switch will bounce, but the eFuse will have no issue responding to this disturbance. It will respond to
the fault within 10 μs and the current will be limited to the short circuit current limit level. After some time the
device will enter thermal shutdown due to the high current and voltage between VCC and source (output voltage)
pins. 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 6: This is a demonstration of the current limiting circuit. The eFuse responds quickly to
the short circuit event and begins conducting at the short circuit current limit.
