AD8452 datasheet(28/35 Pages) AD

28 / 35 page

Data Sheet

AD8452

Rev. 0 | Page 27 of 34

FAULT INPUT

The AD8452 FAULT pin is a logic level input intended to be

driven by an external fault detector. The external fault signal

stops PWM operation of the system to avoid damage to the

application and components. When a voltage of less than 1.0 V

(typical) is applied to the FAULT pin, the AD8452 is disabled,

driving the DL and DH PWM drive signals low. The soft start

capacitor (CSS) is discharged through a switch until a voltage

≥1.2 V is applied to the FAULT pin, and the AD8452 resumes

switching. The FAULT pin sustains voltages as high as 60 V.

THERMAL SHUTDOWN (TSD)

The AD8452 has a TSD protection circuit. The TSD triggers and

disables switching when the junction temperature reaches

150°C (typical). While in TSD, the DL and DH signals are driven

low, the CSS capacitor discharges to ground, and VREG remains

high. Normal operation resumes when the junction temperature

decreases to 135°C (typical).

AD8452 Datasheet(PDF) 28 Page - Analog Devices