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
35/54
PROTECTIVE FEATURES
Output Overvoltage Protection (OVP)
The voltage at the FB is compared to a 0.8V internal reference while the overvoltage protection (OVP) has a threshold of
0.92V. If FB rises above this limit, the on-time is immediately terminated. It can occur if the input voltage is increased with a
very high



or if the output current is decreased with a very



. Once OVP is activated, the high-side MOSFET on-times
will be inhibited until the condition clears. Additionally, the low-side MOSFET will remain on until the inductor current falls to
zero. Then both high-side and low-side MOSFETs are turned off as long as the overvoltage condition is not removed (see
figure below).
0,0
0,2
0,4
0,6
0,8
1,0
1,2
1,4
1,6
-4,0
0,0
4,0
8,0
12,0
16,0
20,0
24,0
28,0
0 2 4 6 8 10 12 14 16 18 20 22 24
FB Voltage [V]
Switch Node Voltage [V]
Time [µs]
OVP detection
Low-side and high-side OFF
on-time terminated earlier