ADPL74101 datasheet(22/49 Pages) AD

22 / 49 page

Data Sheet

ADPL74101

analog.com

Rev. 0

22 of 49

Output Overvoltage Protection

The ADPL74101 has an overvoltage comparator that guards against transient overshoots and other more serious

conditions that can cause output overvoltage. When the VFB pin rises by more than 10% above its regulation point

of 0.8V, the top FET turns off, and the inductor current cannot reverse.

Foldback Current

When the output voltage falls to less than 70% of its nominal level, foldback current limiting is activated,

progressively lowering the peak current limit in proportion to the severity of the overcurrent or short-circuit

condition. Foldback current limiting is disabled during the soft start interval (as long as the VFB voltage is keeping up

with the TRACK/SS voltage).

Power Good

The ADPL74101 has a PGOOD pin that is connected to the open-drain of an internal N-channel MOSFET. The MOSFET

turns on and pulls the PGOOD pin low when the VFB voltage is not within ±10% of the 0.8V reference. The PGOOD pin

is also pulled low when the RUN pin is low (shutdown). When the VFB voltage is within the ±10% requirement, the

MOSFET turns off, and the pin can be pulled up by an external resistor to a source no greater than 6V, such as INTVCC.

ADPL74101 Datasheet(PDF) 22 Page - Analog Devices