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A Product Line of
Diodes Incorporated
ZXLD1374
Application Information (cont.)
350mA Buck-boost LED driver
In
this
application
example,
ZXLD1374
is
connected as a Buck-boost LED driver with
schematic and parts list shown below. The LED
driver is able to deliver 350mA of LED current into
4/5 high brightness LED with input voltage ranged
from 7V to 20V. In order to increase the driving
voltage level for the internal MOSFET during low
voltage input, bootstrap circuit formed by R6 D2
and C6 are used to supply higher voltage to the
VAUX pin.
Since the Buck-boost LED driver can handle an
input voltage range below and above the LED
voltage, this versatile input voltage range makes it
ideal for automotive lighting applications.
Figure 52 Application Circuit of 350mA Buck-Boost LED Driver
Bill of Material
Ref No.
U1
Q1
D1
D2
Z1
L1
C1
C3 C4 C5
C2 C6
R1 R2
R3
R4
R5
R6
Value
60V LED driver
60V MOSFET
100V 3A Schottky
100V 1A Schottky
47V 410mW Zener
47μH 2.6A
100pF 50V
4.7μF 50V X7R
1μF 50V X7R
300m ? 1%
120k ? 1%
36k ? 1%
2.7k ?
1k ?
Part No.
ZXLD1374
2N7002A
PDS3100-13
B1100
BZT52C47
744771147
SMD 0805/0603
SMD1210
SMD1206
SMD1206
SMD 0805/0603
SMD 0805/0603
SMD 0805/0603
SMD 1206
Manufacturer
Diodes Inc
Diodes Inc
Diodes Inc
Diodes Inc
Diodes Inc
Wurth Electronik
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Typical Performance
100%
90%
80%
70%
60%
50%
40%
30%
Efficiency vs Input Voltage
400
350
300
250
200
150
LED Current vs Input Voltage
20%
10%
0%
4 LED VF=12.5V
5 LED VF=15.6V
100
50
0
4 LED VF=12.5V
5 LED VF=15.6V
7
8
9
10
11
12
13
14
15
16
17
18
19
20
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Input Voltage
Figure 53 Efficiency
Input Voltage
Figure 54 Line Regulation
ZXLD1374
Document number: DS35032 Rev. 3 - 2
37 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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