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 15/24
BLOCK DIAGRAM
C
IN
C
OUT
V
IN
V
OUT
C
boot
GND
PWM Current
Mode Controller
Driver
Protection
Circuitry
V
REF
C
ss
Power Module
Error A mplifier
0.8V
UVLO
C
COMP
R
COMP
DCSupply
47µF
4.7µF
22µH
Load
VIN
VOUT
2
31
CIRCUIT DESCRIPTION
The MagI³C Power Module 17301xx42 is based on a non-synchronous step-down regulator with integrated MOSFET, free-
wheeling diode, power inductor, input and output capacitors. The control scheme is based on a Current Mode (CM) regulation
loop.
The V
OUT
of the regulator is divided with the internal feedback resistor network and fed into the error amplifier which compares
this signal with the internal 0.8V reference. The error signal is amplified and controls the on-time of a fixed frequency pulse
width generator. This signal drives the power MOSFET.
The Current Mode architecture features a constant frequency during load steps. Only the on-time is modulated. It is internally
compensated and stable.