TPS54719

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SLVSB69 – JUNE 2012

The TPS54719 minimizes excessive output overvoltage transients by taking advantage of the overvoltage power

good comparator. When the regulated output voltage is greater than 110% of the nominal voltage, the

overvoltage comparator is activated, and the high side MOSFET is turned off and masked from turning on until

the output voltage is lower than 108%.

The SS/TR pin is used to minimize inrush currents or provide power supply sequencing during power up. A small

value capacitor should be coupled to the pin for slow start. The SS/TR pin is discharged before the output power

up to ensure a repeatable restart after an over-temperature fault, UVLO fault or disabled condition.

The use of a frequency foldback circuit reduces the switching frequency during startup and over current fault

conditions to help limit the inductor current.

Copyright © 2012, Texas Instruments Incorporated

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