Datasheet

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© May 2016
Würth Elektronik eiSos GmbH & Co. KG - Data Sheet - REV 1.0
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WPMDU1251501 / 171021501
MagI³C Power Module
VDRM - Variable Step Down Regulator Module
Step 5 Select Soft-Start capacitor (C
SS
)
Programmable soft-start permits the regulator to slowly ramp up to its steady state operating point after being enabled,
thereby reducing current inrush from the input supply and slowing the output voltage rise-time to prevent overshoot.
C
IN
EN/UVLO
VIN
RT/CLK
PGND SS/TRK
FB
VOUT
Module
R
SET
C
OUT
AGND
26
27
31
28
36
V
IN
V
OUT
INTSS
29
PG
35
Figure 2. Basic Soft-Start configuration
In minimum external components configuration (Figure 2), connecting the INTSS pin (Pin 29) to AGND while leaving SS
pin (Pin 28) the MagI³C Power Module powers-up with a soft-start interval of approximately 5ms, using the internal soft-
start circuitry. This reduces the slope of the output voltage. The soft-start circuitry introduces a short time delay when a
valid input voltage is recognized.
Figure 3 shows the start-up waveforms of the MagI³C Power Module, operating from a 24 V input and the output voltage
adjusted to 5 V.
23D
V
OUT
V
IN
V
PG
2 ms/Div
10V/Div
2V/Div
5V/Div
Figure 3. Startup V
IN
=10V; I
OUT
=2A