Data Sheet

WPMDH1152401 / 171012402
MagI
3
C Power Module
VDRM – Variable Step Down Regulator Module
we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 2.0
© December 2017
22/54
The use of very low ESR capacitors leads to an output voltage ripple as shown below (generic waveform):
When capacitors with slightly higher ESR are utilized, the dominant parameter that influences the output voltage ripple is just
the ESR:
ESR≤
V
OUT ripple
∆I
L

(12)
Consequently, the shape of the output voltage ripple changes as shown below (generic waveform):
-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
Output voltage ripple [mV]
time [µs]
Output voltage ripple with high ESR capacitors