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AL8400

LINEAR LED DRIVER-CONTROLLER



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AL8400 pdf
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AL8400 /AL8400Q
LINEAR LED DRIVER-CONTROLLER with 200mV
CURRENT SENSE VOLTAGE and AUTOMOTIVE GRADE
Description
The AL8400 is a 5-terminal adjustable Linear LED driver-controller
offering excellent temperature stability and output handling capability.
The AL8400 simplifies the design of linear and isolated LED drivers.
With its low 200mV current sense FB pin, it controls the regulation of
LED current with minimal power dissipation when compared to
traditional linear LED drivers. This makes it ideal for medium to high
current LED driving.
Pin Assignments
The AL8400 open-collector output can operate from 0.2V to 18V
enabling it to drive external MOSFET and Bipolar transistors. This
enables the MOSFET and Bipolar selection to be optimized for the
chosen application. It also provides the capability to drive longer LED
chains, by tapping VCC from the chain, where the chain voltage may
exceed 18V.
It is available in the space saving low profile SOT353 package.
The AL8400Q is Automotive Grade and is AEC-Q100 Grade 1
qualified.
Applications
Isolated Offline LED Lamps
Linear LED Driver
LED Signs
Instrumentation Illumination
Features
Low Reference Voltage (VFB = 0.2V)
-40 to +125°C Temperature Range
3% Reference Voltage Tolerance at +25°C
Low Temperature Drift
0.2V to 18V Open-Collector Output
High Power Supply Rejection:
ƒ (> 45dB at 300kHz)
AL8400QSE-7 Automotive Grade qualified to AEC-Q100 Grade 1
SOT353: Available in “Green” Molding Compound (No Br, Sb)
ƒ Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
ƒ Halogen and Antimony Free. “Green” Device (Note 3) 
Notes:
1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com for more 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
Vcc
GND
AL8400/ AL8400Q
Document number: DS35115 Rev. 4 - 2
RB
3
Vcc
CD OUT 5
AL8400
GND
2
FB 4
E1
1
CL
Q2
RSET
ILED = VREF/RSET
1 of 13
www.diodes.com
August 2012
© Diodes Incorporated



No Preview Available !

AL8400 pdf
AL8400 /AL8400Q
Pin Descriptions
Pin
Number
1
2
3
4
5
Name
E1
GND
VCC
FB
OUT
Function
Emitter Connection. Connect to GND.
Analog Ground. Ground return for reference and amplifier. Connect to E1.
Supply Input. Connect a 0.47μF ceramic capacitor close to the device from VCC to GND.
Feedback Input. Regulates to 200mV nominal.
Output. Connect a capacitor close to device between OUT and GND. See the Applications Information section.
Functional Block Diagram
Figure 1 Block Diagram
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Rating
Unit
VCC
VOUT
VFB
VE1
TJ
TST
Supply Voltage Relative to GND
OUT Voltage Relative to GND
FB Voltage Relative to GND
E1 Voltage Relative to GND
Operating Junction Temperature
Storage Temperature
20
20
20
-0.3 to+0.3
-40 to 150
-55 to 150
V
V
V
V
°C
°C
These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure.
Operation at the absolute maximum rating for extended periods may reduce device reliability.
Package Thermal Data
Package
SOT353
θJA
400°C/W
PDIS
TA = +25°C, TJ = +150°C
310mW
AL8400/ AL8400Q
Document number: DS35115 Rev. 4 - 2
2 of 13
www.diodes.com
August 2012
© Diodes Incorporated



Part Number AL8400
Description LINEAR LED DRIVER-CONTROLLER
Maker Diodes Incorporated - Diodes Incorporated
Total Page 13 Pages
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