NIS54xxGEVB
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NIS545x Overvoltage Protection
Connect the eFuse to a variable DC power supply. Place jumpers J2 (10 Ω), J1 (545x), J4, and J13. Turn
the power supply from 5 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 6 V. After conducting 1.5 A with a
voltage drop of 4 V, the eFuse 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 10:
In this test, the input voltage (blue trace) is brought to 10 V. The output voltage (red
trace) is clamped at about 6 V. After some time the device enters thermal shutdown.
