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 23/48
The use of very low ESR capacitors leads to an output voltage ripple as shown below:
When capacitors with slightly higher ESR are utilized, the dominant parameter which influences the output voltage ripple is
just the ESR:
ESR≤
V

∆I

(7)

Consequently the shape of the output voltage ripple changes, as shown below:
-10
-5
0
5
10
0 1 2 3
Output voltage ripple [mV]
time [µs]
Output voltage ripple with low ESR capacitors
-100
-50
0
50
100
0 1 2 3
Outputvoltageripple [mV]
time [µs]
Output voltage ripple with high ESR capacitors