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ZXLD1374EST20TC Datasheet(PDF) 33 Page - Diodes Incorporated

Part # ZXLD1374EST20TC
Description  60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST LED DRIVER CONVERTER
PDF  35 Pages
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

ZXLD1374EST20TC Datasheet(HTML) 33 Page - Diodes Incorporated

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ZXLD1374
ZXLD1374
Document number: DS35032 Rev. 1 - 2
Page 33 of 35
www.diodes.com
October 2010
© Diodes Incorporated
A Product Line of
Diodes Incorporated
Applications Examples
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 58. Application circuit of 350mA Buck-boost LED driver
Bill of Material
Ref No.
Value
Part No.
Manufacturer
U1
60V LED driver
ZXLD1374
Diodes Inc
Q1
60V MOSFET
2N7002A
Diodes Inc
D1
100V 3A Schottky
PDS3100-13
Diodes Inc
D2
100V 1A Schottky
B1100
Diodes Inc
Z1
47V 410mW Zener
BZT52C47
Diodes Inc
L1
47uH 2.6A
744771147
Wurth Electronik
C1
100pF 50V
SMD 0805/0603
Generic
C3 C4 C5
4.7uF 50V X7R
SMD1210
Generic
C2 C6
1uF 50V X7R
SMD1206
Generic
R1 R2
300m
Ω 1%
SMD1206
Generic
R3
120k
Ω 1%
SMD 0805/0603
Generic
R4
36k
Ω 1%
SMD 0805/0603
Generic
R5
2.7k
Ω
SMD 0805/0603
Generic
R6
1k
Ω
SMD 1206
Generic
Typical Performance
Efficiency vs Input Voltage
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Input Voltage
4 LED VF=12.5V
5 LED VF=15.6V
Figure 59. Efficiency
LED Current vs Input Voltage
0
50
100
150
200
250
300
350
400
7
8
9
1011
12131415
1617
18
1920
Input Voltage
4 LED VF=12.5V
5 LED VF=15.6V
Figure 60. Line regulation



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