7.3.3 Regulation Comparator

The feedback voltage at the FB pin is compared to the SS pin voltage V_SS. In normal operation when the output voltage is in regulation, an ON-time period is initiated when the voltage at FB pin falls below V_SS. The high-side buck switch stays on for the ON-time one-shot period causing the FB voltage to rise. After the on-time period expires, the high-side switch will remain off until the FB voltage falls below V_SS. During start-up, the FB voltage is below V_SS at the end of each on-time period and the high-side switch turns on again after the minimum forced off-time of 170 ns (typical). When the output is shorted to ground (FB = 0 V), the high side peak current limit is triggered, the high-side FET is turned off, and remains off for a period determined by the current limit OFF-time one-shot. See the Current Limit section for additional information.