SNVS690I January 2011 – August 2021 LMZ14201H
PRODUCTION DATA
Constant ON-Time control is based on a comparator and an ON-time one-shot, with the output voltage feedback compared to an internal 0.8V reference. If the feedback voltage is below the reference, the high-side MOSFET is turned on for a fixed ON-time determined by a programming resistor RON. RON is connected to VIN such that ON-time is reduced with increasing input supply voltage. Following this ON-time, the high-side MOSFET remains off for a minimum of 260 ns. If the voltage on the feedback pin falls below the reference level again the ON-time cycle is repeated. Regulation is achieved in this manner.