The device implements current mode control, which uses the COMP pin voltage to control the turn off of the high-side MOSFET and the turn on of the low-side MOSFET on a cycle-by-cycle basis. Each cycle the switch current and the current reference generated by the COMP pin voltage are compared, when the peak switch current intersects the current reference, the high-side switch is turned off. In the event of an overcurrent detection, the following sequence of events occurs:

• The SS/TR pin is discharged
• When the voltage at SS/TR falls below VSENSE, the device will stop switching
• As VOUT decreases, VSENSE does as well. At the point when VSENSE is equal to the voltage at SS/TR, the device will begin switching again.