Datasheet

WPMDB1400362Q / 171040302
MagI
3
C Power Module
VDRM – Variable Step Down Regulator Module
we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0
© May 2016 15/48
LIGHT LOAD OPERATION
The 171040302 forces the CCM (Continuous Conduction Mode) operation at light load (forced CCM). The inductor current
during t
OFF
can flow in the opposite direction, i.e. from the output capacitor and load to ground, through the low side
MOSFET. In this way during t
OFF
the output capacitor is discharged and loses the excess of charge gathered during t
ON
.
In this way the switching frequency always remains constant, giving a relevant advantage in terms of filtering and avoiding
interferences in undesired frequency ranges. Any load change will simply shift the inductor current up and down (see figure
below).