Issue 2 - July 2006 1 www.zetex.com
© Zetex Semiconductors plc 2006
DN68
ZXSC310 High power torch reference design
Description
This design note shows a typical ZXSC310 LED driver circuit for a high powered LED torch. The
input voltage ranges from 0.7V to 1.6V with a maximum output current of 335mA at 1.4V input.
A typical schematic diagram is shown in Figure 1.
Figure 1 Schematic diagram
Reference Value Part number Manufacturer Contact details Comments
U1 ZXSC310E5 Zetex www.zetex.com LED driver in SOT23-5
Q1 FMMT617 Zetex www.zetex.com
Low sat. NPN in SOT23
D1 2A ZHCS2000 Zetex www.zetex.com 2A Schottky in SOT23
L1 7.5H DO3316P-153x2 Coilcraft
www.coilcraft.com
I
SAT
= 3A
R1 19.5m⍀ Generic Generic NA 0805 size
C1 1FGeneric Generic NA
C2 220FGeneric Generic NA
C3 100FGeneric Generic NA
Table 1 Bill of materials
Q1
L1
V
IN
Vcc
Gnd
Isense
Vdrive
Stdn
U1
ZXSC310
D1
C2
R1
C3
C1