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Under Current Fault (DC Modulated Disconnect)
TPS23841
SLUS745A – NOVEMBER 2006 – REVISED MAY 2007
AUTO MODE FUNCTIONAL DESCRIPTION (continued)
Under current fault (dc modulated disconnect) is a condition when the load current that is being measured drops
below 7.5mA and turns on the disconnect timer. If the disconnect timer reaches its time out limit that is set
between 300ms to 400ms the corresponding port is turned off and the load disconnect fault code generated in
the Port Status 1 register. If the under current condition goes away prior to the disconnect timer reaching its limit
the timer is reset and the port remains powered.
Figure 8 shows DC Disconnect event. In this setup the load current was set right above the 7.5mA threshold.
The duty cycle of the load was then adjusted until the off period exceeded the disconnect time out, causing
turn-off of the port. The time-out period was > 300 ms.
Figure 8.
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