DN71 Datasheet, PDF (1/2 Pages) Zetex Semiconductors – ZXSC400 Solution for Luxeon V Star high powered LED

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.
V_IN=4.2V to 5.4V
L1
D1
U1
Vcc Vdrive
Stdn Isense
C1
Gnd
V_FB
ZXSC400
Q1
C2
R1
R2
#
Ref.
U1
Q1
D1
L1
R1
R2
C1
C2
Value
2A
22mH
22mV
350mV
220mF
450mF
Figure 1 Schematic diagram
Part number
ZXSC400E6
FZT1049
ZHCS2000
Generic
Generic
Generic
Generic
Generic
Manufacturer
Zetex
Zetex
Zetex
Generic
Generic
Generic
Generic
Generic
Table 1 Bill of materials
Comments
LED driver in SOT23-6
Low sat NPN in SOT23
2A Schottky in SOT23
I_SAT = 3A
0805 size
0805 size
Issue 5 - July 2006
1
© Zetex Semiconductors plc 2006
www.zetex.com