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A Product Line of
Diodes Incorporated
ZXLD1374
Application Information (cont.)
1.5A Buck LED Driver
In this application example, ZXLD1374 is connected
as a Buck LED driver with schematic and parts list
shown below. The LED driver is able to deliver 1.5A of
LED current to single or multiple LEDs in series with
input voltage ranged from 10V to 50V. In order to
achieve high efficiency under high LED current, Super
Barrier Rectifier (SBR) with low forward voltage is
used as free wheeling rectifier.
With only a few extra components, the ZXLD1374
LED driver is able to deliver LED power of greater
than 60W. This is suitable for applications which
require high LED power likes high power down
lighting, wall washer, automotive LED lighting etc.
Figure 46 Application Circuit of 1.5A Buck LED Driver
Bill of Material
Ref No.
U1
D1
L1
C1
C2
C3 C4 C5
R1 R2
R3
Value
60V 1.5A LED driver
100V 3A SBR
33μH 4.2A
100pF 50V
1μF 100V X7R
2.2μF 100V X7R
300m ? 1%
4.7 ?
Part No.
ZXLD1374
SBR3U100
744770933
SMD 0805/0603
SMD1206
SMD1210
SMD1206
SMD1206
Manufacturer
Diodes Inc
Diodes Inc
Wurth Electronik
Generic
Generic
Generic
Generic
Generic
Typical Performance
100%
90%
80%
70%
60%
50%
Efficiency vs Input Voltage
1600
1200
800
LED Current vs Input Voltage
40%
30%
20%
1 LED VF=3.4V
3 LED VF=9.8V
5 LED VF=16V
400
1 LED VF=3.4V
3 LED VF=9.8V
5 LED VF=16V
10%
0%
10
15
20
25 30 35
Input Voltage (V)
40
45
50
0
10
15
20
25 30 35
Input Voltage (V)
40
45
50
Figure 47 Efficiency
Figure 48 Line Regulation
ZXLD1374
Document number: DS35032 Rev. 3 - 2
35 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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