DN73

DN73
ZXSC300 Step down converter for 3W LED
Description
This design note shows the ZXSC300 or ZXSC310 driving a 3W LED. The input voltage ranges
from 6.2V to 3.8V with a maximum output current of 1.11A at 6V input.
A typical schematic diagram is shown in Figure 1.
Figure 1
Ref.
Value
Schematic diagram
Part number
Manufacturer
Comments
U1
ZXSC300/310
Zetex
LED Driver in SOT23-5
Q1
ZXMN2A01F
Zetex
SOT23 MOSFET
D1
1A
ZHCS1000
Zetex
1A Schottky in SOT23
L1
22␮H
Generic
Generic
ISAT = 3A
R1
20m⍀
Generic
Generic
0805 size
C1
100␮F
Generic
Generic
C2
100␮F
Generic
Generic
Table 1
Issue 2 - July 2006
© Zetex Semiconductors plc 2006
Bill of materials
1
www.zetex.com
DN73
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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