DN68 Datasheet, PDF (1/2 Pages) Zetex Semiconductors – ZXSC310 High power torch reference design

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.
V_IN
C1
L1
U1
Vcc
Vdrive
Stdn
Isense
Gnd
ZXSC310
D1
Q1
C2 C3
R1
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
7.5␮H DO3316P-153x2 Coilcraft
www.coilcraft.com I_SAT = 3A
R1
19.5m⍀ Generic
Generic
NA
0805 size
C1
1␮F Generic
Generic
NA
C2
220␮F Generic
Generic
NA
C3
100␮F Generic
Generic
NA
Table 1 Bill of materials
Issue 2 - July 2006
1
© Zetex Semiconductors plc 2006
www.zetex.com