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