DN76

DN76
ZXLD1100 and ZXLD1101 driving from 3 to 6 LEDs
Description
This design note shows the ZXLD1100 and ZXLD1101 driving series connected LEDs. The input
voltage range is 2.5V to 5.5V. The same circuit can be used for up to 6 LEDs.
The ZXLD1100 contains onchip open circuit LED protection. This function would require an
additional Zener and resistor with the ZXLD1101.
Note: LED current is set to 15mA
Figure 1
Ref.
Value
Package
Part number
Schematic diagrams
Manufacturer Contact details
Notes
U1
TSOT23-5 ZXLD1101ET5
Zetex
www.zetex.com
LED driver IC
U1
SC706
ZXLD1100H6
Zetex
www.zetex.com
LED driver IC
Zetex
www.zetex.com
400mA Schottky
diode
D1
400mA SOD323
ZHCS400
L1
10␮H
CMD4D11-100MC Sumida
R1
6.8⍀
0603
Generic
Generic
R21
100k⍀
0603
Generic
Generic
C1
1␮F
0603
Generic
Generic
C2
1␮F
0603
Generic
Generic
NSCW215
Nichia
LEDs
Table 1
Issue 2 - July 2006
© Zetex Semiconductors plc 2006
www.sumida.com 1mm height profile
www.nichia.com 6pcs per board
Bill of materials
1
www.zetex.com
DN76
Typical operating characteristics
(For typical application circuit where Tamb = 25°C unless otherwise stated)
Figure 2
Performance graphs
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2
Issue 2 - July 2006
© Zetex Semiconductors plc 2006
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