ZXLD1374 Datasheet, PDF (1/35 Pages) Diodes Incorporated – 60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST LED DRIVER CONVERTER

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Diodes Incorporated
ZXLD1374
60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST LED DRIVER CONVERTER
Description
The ZXLD1374 is an LED driver converter IC with integrated
1.5A low side switch to drive high current LEDs. It is a multi-
topology converter enabling it to efficiently control the
current through series connected LEDs. The multi-topology
enables it to operate in Buck, Boost and Buck-boost
configurations.
The 60V capability coupled with its multi-topology capability
enables it to be used in a wide range of applications and
drive in excess of 16 LEDs in series.
The ZXLD1374 is a modified hysteretic converter using a
patent pending control scheme providing high output current
accuracy in all three topologies. High accuracy dimming is
achieved through DC control and high frequency PWM
control.
The ZXLD1374 uses two pins for fault diagnosis. A flag
output highlights a fault, while the multi-level status pin gives
further information on the exact fault.
Pin Assignments
TSSOP-20EP
ADJ 1
REF 2
TADJ 3
SHP 4
STATUS 5
SGND 6
PGND 7
PGND 8
N/C 9
N/C 10
Thermal
Pad
ZXLD1374
20 GI
19 PWM
18 FLAG
17 ISM
16 VIN
15 VAUX
14 LX
13 LX
12 N/C
11 N/C
Features
• 0.5% typical output current accuracy
• 6.3 to 60V operating voltage range
• 1.5A integrated low side switch
• LED driver supports Buck, Boost and Buck-boost
topologies
• Wide dynamic range dimming
o 20:1 DC dimming
o 1000:1 dimming range at 500Hz
• Up to 1MHz switching
• High temperature control of LED current using TADJ
• Green mold compound (No Br, Sb) and RoHS
compatible
Typical Application Circuit
Curve showing LED current vs. T_LED
ZXLD1374
Document number: DS35032 Rev. 1 - 2
Page 1 of 35
www.diodes.com
October 2010
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