Diodes ZXLD1374 User Manual
Thermal pad, Zxld1374, Description
ZXLD1374
Document number: DS35032 Rev. 3 - 2
1 of 39
September 2012
© Diodes Incorporated
ZXLD1374
A Product Line of
Diodes Incorporated
60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST
LED DRIVER CONVERTER WITH AEC-Q100
Description
The ZXLD1374 is a 60V LED driver with integrated 1.5A low side
switch to drive high current LEDs. It is a multi-topology converter
enabling it to operate in Buck, Boost and Buck-boost configurations;
efficiently controlling the current of up to 16-series connected LEDs.
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.
The ZXLD1374 has been qualified to AEC-Q100 Grade 1 enabling
operation in ambient temperatures from -40 to +125°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
• 20:1 DC Dimming
• 1000:1 Dimming Range at 500Hz
• Up to 1MHz Switching
• High Temperature Control of LED Current Using TADJ
• AEC-Q100 Grade 1
• TSSOP-20EP: Available in “Green” Molding Compound (No Br,
Sb) with lead Free Finish/ RoHS Compliant
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
ADJ
1
REF
2
TADJ
3
SHP
4
STATUS
5
SGND
6
PGND
7
PGND
8
N/C
9
N/C 10
20 GI
19 PWM
18 FLAG
17 ISM
16 VIN
15 VAUX
14 LX
13 LX
12 N/C
11 N/C
Thermal
Pad
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. Se information about Diodes Incorporated’s definitions of Halogen and Antimony free, "Green" and Lead-Free.
3. Halogen and Antimony free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
Typical Applications Circuit
C2
100pF
ZXLD1374
L1
TH1
R4
RGI2
RGI2
C1
C
OUT
SD1
PSD3200
R1
PWM
VAUX VIN
ISM
GI
ADJ
REF
TADJ
SHP
SGND PGND
LX
LX
FLAG
STATUS
NC
V
IN
GND