Data Sheet
WPMDH1100xx1S / 173010x42
MagI
3
C Power Module
FDSM – Fixed Step Down Regulator Module
we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0
© June 2016 19/24
Generating negative output voltage
Many industrial applications require negative voltages. The 173010x42 can easily provide a negative voltage using the circuit
shown below.
It is important to be aware that in this configuration the 173010x42 must withstand the sum of the input voltage and the absolute
value of the output voltage (V
IN
+ |V
OUT
|), instead of just the input voltage. This means that the maximum operating voltage
should be limited to 42V - |V
OUT
| (e.g. if the 171010542 is used in this configuration, the input voltage should not exceed 37V).
Moreover, the maximum output current of this configuration is no longer 1A, instead it must be reduced according to the below
mentioned formula (see also the graph below):
where D is the duty cycle, in this case defined according to:
VIN GND
VOUT
1 2
3
GND
V
OUT-
173010x42
C
IN
V
IN
GND
10µF