ZHCSH22C January 2009 – November 2017 LM3241
PRODUCTION DATA.
While in PWM mode, the LM3241 uses an internal NFET as a synchronous rectifier to reduce rectifier forward voltage drop and associated power loss. Synchronous rectification provides a significant improvement in efficiency whenever the output voltage is relatively low compared to the voltage drop across an ordinary rectifier diode.
With medium and heavy loads, the NFET synchronous rectifier is turned on during the inductor current-down slope in the second part of each cycle. The synchronous rectifier is turned off prior to the next cycle. The NFET is designed to conduct through its intrinsic body diode during transient intervals before it turns on, eliminating the need for an external diode.