Issue 5 - July 2006 1 www.zetex.com
© Zetex Semiconductors plc 2006
DN71
ZXSC400 Solution for Luxeon
®
V Star high powered LED
Description
This design note shows the ZXSC400 driving a Luxeon
®
V Star LED. The input voltage ranges
from 4.2V to 5.4 V with a maximum output current of 790mA at 5V input.
A typical schematic diagram is shown in Figure 1.
Figure 1 Schematic diagram
#
Ref. Value Part number Manufacturer Comments
U1 ZXSC400E6 Zetex LED driver in SOT23-6
Q1 FZT1049 Zetex Low sat NPN in SOT23
D1 2A ZHCS2000 Zetex 2A Schottky in SOT23
L1 22mH Generic Generic I
SAT
= 3A
R1 22mV Generic Generic 0805 size
R2 350mV Generic Generic 0805 size
C1 220mF Generic Generic
C2 450mF Generic Generic
Table 1 Bill of materials
Vcc
Gnd
Isense
Vdrive
Stdn
V
FB
U1
ZXSC400
C2
L1
V
IN
=4.2V to 5.4V
C1
R1
R2
Q1
D1
