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Over/Under Voltage Fault

TPS23841

SLUS745A – NOVEMBER 2006 – REVISED MAY 2007

AUTO MODE FUNCTIONAL DESCRIPTION (continued)

For the TPS23841, port over and undervoltge detection is disabled by default after device POR. This continuous

voltage monitoring feature can subsequently be enabled by writing a logic 1 to bit D2 in the Common Control

Over/under voltage faults are only processed after port power up has completed (voltage/power ramp to PD is

done). The TPS23841 measures the voltage between the P and N pin and if this voltage drops below the under

voltage threshold (typically 43 V) or increases above the over voltage threshold (typically 55 V) the voltage timer

is turned on. When the voltage timer reaches its time-out limit that is set between 2 ms to 5 ms the

corresponding port is turned off and the UV/OV fault code generated in the Port Status 1 register. If the

over/under voltage condition is removed prior to the voltage timer reaching its limit the timer is reset and waits

for the next event. Figure 6 shows a voltage fault lasting for more then 2 ms that has caused the port to

shutdown.

Figure 6.

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