171050601 查看數據表（PDF） - Wurth Elektronik GmbH & Co. KG, Germany.
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171050601
Wurth Elektronik GmbH & Co. KG, Germany.
171050601 Datasheet PDF : 56 Pages
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WPMDM1500602 / 171050601
MagI3C Power Module
VDRM – Variable Step Down Regulator Module
Step 5 Optional: Voltage tracking
The tracking function allows the module to be connected as a slave supply to a primary voltage rail (often the 3.3V system
rail) where the slave module output voltage is lower than that of the master. The schematic below illustrates the general idea
of connecting two power modules in a master-slave configuration.
VIN
1
VIN
Master
7
VOUT
Modu le
6 SS/TRK
PGND AGND 4
CSS1
EP
VOUT1
1
VIN
RFBT1
RTKT2
Slave
7
VOUT
Modu le
RFBB1
6 SS/TRK
RTKB2
PGND
EP
AGND 4
VOUT2
RFBT2
RFBB2
Proper configuration of the tracking resistor divider (RTKT2 and RTKB2) at the slave module allows for implementing
simultaneous or ratiometric output tracking. The tracking function is only supported during the power up interval of the
master supply.
Simultaneous tracking
Simultaneous output tracking allows the slave rail to power up coincidental with the master (voltage difference between the
rails during ramp-up is very small, <0.15V). The condition to implement a simultaneous tracking is:
RTKT2
RTKB2
=
RFBT2
RFBB2
(14)
The values for the tracking resistive divider should be selected small enough to minimize the effect of the internal 50uA
current source. The curve below shows the simultaneous tracking with RTKT2 = 1kΩ, RTKB2=464Ω (for the feedback resistor
divider the values of the evaluation board are used, see “Bill of Material” on page 48).
VIN = 12V, TA = 25 C, CSS1 = 470nF, no load
5,0
4,0
tSS1
VOUT1
3,0
VOUT2
2,0
we-online.com
© July 2018
1,0
0,0
0
tSS2
5
10
15
20
25
Time [ms]
Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 2.0
30
27/56
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