Data Sheet

WLMDU9456001JT / 172946001
MagI
3
C Power Module
LDHM - LED Step Down High Current Module
We-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0
© May 2016 25/35
Step 5 Parallel operation
When a load current higher than 450 mA is required by the application, LED driver modules can be used in parallel to deliver
higher current. With common V
IN
and GND pins, each LED driver module will operate as independent asynchronous current
source driving the same current. The total DC current of the modules will be additive; however, low frequency sub-harmonic
current ripple may be present and its frequency and magnitude will depend upon the phase relationship between the internal
clocks as there is no possibility for synchronizing driver clocks. Current sharing modules should have a local C
IN
capacitor of
minimum 2.2 μF located as close to V
IN
and GND as possible.
Parallel operation circuit schematic
1234567
LED+ LED+
DIM
GND ISET
IFIX
LED-
Exposed Pad
(EP)
V
IN
R
IA DJ
C
OUT
1234567
LED+ LED+
DIM
GND ISET
IFIX
LED-
Exposed Pad
(EP)
R
IADJ
C
OUT
High Power LED Array
Module Module
I
LED1
I
LED2
C
IN
C
IN
3 1D
Parallel operation result; I
LED
= 900mA
LED Current (A)
Input Voltage (V)
0 10 20 30 40 50 60
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1 L ED
9 L ED
16LED