Datasheet

TPS51123A
www.ti.com SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012
Overvoltage and Undervoltage Protection
TPS51123A monitors a resistor divided feedback voltage to detect over and under voltage. When the feedback
voltage becomes higher than 115% of the target voltage, the OVP comparator output goes high and the circuit
latches as the top MOSFET driver OFF and the bottom MOSFET driver ON.
Also, TPS51123A monitors VOx voltage directly and if it becomes greater than 5.75 V the TPS51123A turns off
the top MOSFET driver.
When the feedback voltage becomes lower than 60% of the target voltage, the UVP comparator output goes
high and an internal UVP delay counter begins counting. After 32 μs, TPS51123A latches OFF both top and
bottom MOSFETs drivers, and shut off both drivers of another channel. This function is enabled after 2 ms
following ENC has become high.
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