Data Sheet

DNS001, 2015-04-27, RKr Page 1 of 7
R E F E R E N C E D E S I G N N O T E
LED Driver with MagI
3
C Power Module
MagI
3
C
Power Modules
VDRM
- LED Driver Application
DNS001: BY ROLAND KRATZ
7 - 24V INPUT / 0 – 1.5A LED CURRENT
1. Introduction _________________________________________________
The DNS14 is a reference design for the WLMDU9456008T LED driver capable of driving up to 1.5 A output
current using a voltage regulated module and an external secondary regulation loop to establish current
regulation. The external loop regulates a DC output current which results in a constant photon flow. Compared
to other solutions with PWM, this solution is less harmful to the eyes due to the constant photon flow, allowing
the pupil opening to be the proper size for the light intensity emitted. Depending on the LED flux voltage up to
4 LEDs in series can be connected.
2. Features ____________________________________________________
 Input voltage range from 7 V to 24 V
 Output current up to 1.5 A
 Adjustable current from 10 mA to 1.5 A
 Dimming voltage 0 V (10 mA) to 5 V (1.5 A)
 Current regulation
 Output current ripple typ. < 10 mA
 Output power up to 22.5 W
 Series connected LEDs up to 15 V total flux voltage
Figure 1: Development Example
Figure 2: Simplified Schematic