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DN70 Datasheet

ZXSC400 Driving 2 serial high power LEDs

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DN70
ZXSC400 Driving 2 serial high power LEDs
Description
This design note shows the ZXSC400 driving 2 serial LEDs. The input voltage ranges from 2V to
3.6V with a maximum output current of 360mA from 2.6V input.
Figure 1 shows a typical constant current solution with the ZXSC400 driving two 1W LEDs in
series. The wide input voltage range allows the use of different battery cell combinations. This
could be dual alkaline cells with voltage starting from 3V down to 2V or triple NiCad/NiMH cells
with voltage starting from 3.6V down to 2.7V.
www.DataSheet4U.com VIN=1.8V to 3.6V
L1
D1
U1
Vcc Vdrive
Stdn Isense
C1
Gnd
VFB
ZXSC400
Q1
C2
R1 R2
Ref. Value
U1
Q1
D1 2A
L1 22H
R1 18m
R2 820m
R3 1K
C1 22uF/10V
C2 100uF/10V
C3 220nF/10V
Figure 1 Schematic diagram
Part number Manufacturer
ZXSC400E6
Zetex
ZXTN25012EFH Zetex
ZHCS2000
Zetex
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Comments
LED driver in SOT23-6
Low sat. NPN transistor in SOT23
2A Schottky in SOT23
ISAT = 2A
0805 size
0805 size
0805 size
0805 size
Table 1 Bill of materials
Issue 3 - July 2007
© Zetex Semiconductors plc 2007
1
www.zetex.com




Zetex Semiconductors

DN70 Datasheet Preview

DN70 Datasheet

ZXSC400 Driving 2 serial high power LEDs

No Preview Available !

DN70
Typical operating characteristics
(For typical application circuit where Tamb = 25°C unless otherwise stated)
100
90
80
70
60
50
3.6 3.4
www.DataSheet4U.com
3.2 3 2.8 2.6 2.4
Input Voltage (V)
Input Voltage vs Efficiency
2.2
2
0.4
0.2
0.0
3.6
3.4 3.2 3 2.8 2.6 2.4 2.2
Input Voltage (V)
Input Voltage vs Output Current
2
1.6
1.2
0.8
0.4
0.0
3.6
3.4 3.2 3 2.8 2.6 2.4 2.2
Input Voltage (V)
Input Voltage vs Input Current
2
8
6
4
2
0
3.6
3.4 3.2 3 2.8 2.6 2.4 2.2
Input Voltage (V)
Input Voltage vs Output Voltage
2
Figure 2 Performance graphs
www.zetex.com
2 Issue 3 - July 2007
© Zetex Semiconductors plc 2007



Part Number DN70
Description ZXSC400 Driving 2 serial high power LEDs
Maker Zetex Semiconductors
Total Page 4 Pages
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