ZXLD1374_11 DIODES [Diodes Incorporated], ZXLD1374_11 Datasheet - Page 34

• Manufacturer Part Number: ZXLD1374_11
• Description: 60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST
• Manufacturer: DIODES [Diodes Incorporated]

ZXLD1374
Document number: DS35032 Rev. 2 - 2
Applications Examples
350mA Buck-boost LED driver
In
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
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
lighting applications.
Bill of Material
Typical Performance
this
C3 C4 C5
Ref No.
100%
C2 C6
R1 R2
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
it
U1
Q1
D1
D2
C1
R3
R4
R5
R6
Z1
L1
input,
7
application
ideal
8
Efficiency vs Input Voltage
bootstrap
9
for
Figure 59. Efficiency
10
automotive
47V 410mW Zener
11
100V 3A Schottky
100V 1A Schottky
example,
4.7µF 50V X7R
60V LED driver
60V MOSFET
1µF 50V X7R
100pF 50V
300mΩ 1%
12
47µH 2.6A
120kΩ 1%
circuit
36kΩ 1%
Input Voltage
Value
2.7kΩ
1kΩ
13
14
15
60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST
16
4 LED VF=12.5V
5 LED VF=15.6V
17
Figure 58. Application circuit of 350mA Buck-boost LED driver
18
SMD 0805/0603
SMD 0805/0603
SMD 0805/0603
SMD 0805/0603
PDS3100-13
744771147
ZXLD1374
BZT52C47
SMD 1206
www.diodes.com
SMD1210
SMD1206
SMD1206
19
2N7002A
Part No.
B1100
20
34 of 37
LED DRIVER CONVERTER WITH AEC-Q100
400
350
300
250
200
150
100
50
0
7
Wurth Electronik
Manufacturer
Diodes Inc
Diodes Inc
Diodes Inc
Diodes Inc
Diodes Inc
8
Generic
Generic
Generic
Generic
Generic
Generic
Generic
Generic
LED Current vs Input Voltage
Diodes Incorporated
Figure 60. Line Regulation
9
A Product Line of
10
11
12
Input Voltage
13
14
15
16
© Diodes Incorporated
4 LED VF=12.5V
5 LED VF=15.6V
ZXLD1374
17
March 2011
18
19
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