ZXLD1321EV2
Issue 2 – April 2008
www.zetex.com
© Zetex Semiconductors plc, 2008
2
REFERENCE DESIGN
ZXLD1321EV2 evaluation board is designed with LED output connector which is compatible with the FLS Emitter
Board connection standard. The target application is 700mA/1000mA high current LED driver for single or
multiple LEDs with wide input voltage range.
If the ZXLD1321EV2 is connected to 1 off-board LED, the supply voltage is: VIN=2V ~ 3.4V.
The ZXLD1321EV2 boards are initially set at LED current of around 700mA with150m
Ω
(R3) current sensing
resistor. In order to boost the LED current to 1000mA, on-board 300m
Ω
(R3A) could made parallel to R3 by
means of soldering jumper pad JP1.
For other reference designs or further applications information please refer to the ZXLD1321 datasheet.
SCHEMATIC DIAGRAM
Materials List
Ref
Value
Package
Part Number
Manufacturer
Contact Details
U1
LED Driver
DFN14
ZXLD1321DCA
Zetex
www.zetex.com
D1
Schottky Diode
SOT23-6
ZHCS2000
Zetex
www.zetex.com
L1
10uH 2A
MSS7341-103ML
NPIS64D100MTRF
744-777910
Coilcraft
NIC Comps.
Wurth
www.coilcraft.com
www.niccomp.com
www.we-online.com
C1
10nF 10V
0603
Generic
Generic
C2
2.2uF 25V
1206
GRM31MR71E225K
Murata
www.murata.com
C3
4.7uF 50V
1206
GRM31CR71H475K
Murata
www.murata.com
R1
430
Ω
0805
Generic
Generic
R2
25m
Ω
0603
Generic
Generic
R3
150m
Ω
0805
Generic
Generic
R3A
300m
Ω
0805
Generic
Generic
R4
5.1K
Ω
0603
Generic
Generic
Z1
18V 3W Zener
DO-214AC
BZG03C18
Vishay
www.vishay.com
