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AL5814 Datasheet

60V LINEAR DIMMABLE LED CONTROLLER

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Description
The AL5814 is an 8-terminal adjustable linear LED driver-controller
offering excellent temperature stability and output current capability. It
works with a wide input voltage range from 4.5V to 60V. With an
external LED driving power device, its internal power dissipation is
minimized compared with traditional linear LED drivers. This makes it
ideal for medium to high current LED circuits.
The AL5814 has internal output drive capability up to 15mA, which
enables it to drive external Bipolar transistors or MOSFETs. It also
provides the capability to drive longer LED chains with low drop-out
voltage and multiple LED channels.
The VSET pin is used to directly set output current feedback level.
Using a resistor divider between REF pin and VSET pin, the output
current can be set. Additionally, the use of an NTC resistor allows the
creation of an accurate and configurable thermal fold-back behavior.
The AL5814 provides an LED-open detection feature through its
VFAULT pin. If VFAULT is brought lower than 2.5V (by any one of the
multiple LED channels going open) the AL5814’s output will go low
turning off the external transistors. The device will recover when the
open condition is removed. This ability of VFAULT to turn off the
external transistors also allows PWM dimming of the LED current by
adding PWM control signal on VFAULT pin.
The AL5814 uses application of power to enable the LED strings. If a
separate enable pin is needed the AL5817 should be used.
The AL5814 is available in the thermally enhanced MSOP-8EP
package.
AL5814
60V LINEAR DIMMABLE LED CONTROLLER
Pin Assignments
(Top View)
VCC
REF
VSET
GND
1
2
3
4
EP
MSOP-8EP
8 VFAULT
7 OUT
6 SFAULT
5 FB
Applications
Automotive Rear Combination Light
LED Signs
Instrumentation Illumination
Refrigerator Lights
Features
Wide Input Voltage Range from 4.5V to 60V
Configurable LED Current Setting
4% Reference Voltage Tolerance
Low Temperature Drift
15mA Output Drive Capability for MOSFET or Bipolar Transistor
LED Open Protection Detected by VFAULT Pin
LED Thermal Fold-back Configured by VSET
Over Temperature Protection (OTP)
Input Under Voltage Lock-Out
PWM Dimming Realized Through VFAULT pin
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ 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.
AL5814
Document number: DS40390 Rev. 3 - 2
1 of 14
www.diodes.com
August 2018
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AL5814 Datasheet

60V LINEAR DIMMABLE LED CONTROLLER

No Preview Available !

Typical Application Circuit
VIN VIN
R5
C1
R6
AL5814
VCC
VFAULT
REF
OUT
VSET
GND
SFAULT
FB
R4
D1
R2 Q1
R3
R1
R5
C1
R6
Figure 1
AL5814
AL5814
VCC
VFAULT
REF
OUT
VSET
GND
SFAULT
FB
R4
D1
R2 Q1
R3
R1
Pin Descriptions
Pin Number
1
2
Pin Name
VCC
REF
3 VSET
4 GND
5 FB
6 SFAULT
7 OUT
8 VFAULT
EP EP
Function
Supply input
Internal reference voltage.
The maximum recommended output current is 50µA and the maximum recommended capacitor
connected from this pin to GND is less than100pF.
A potential divider from REF to VSET can be used to accurately set the output LED current.
LED current setting threshold.
The voltage on VSET sets the reference voltage for the FB pin. This pin is pulled down internally if left
floating. The capacitance if needed between VSET and GND is recommended to be less than 1nF.
Ground
Feedback input.
When control loop is operating in linear mode, the FB pin will be regulated to the level set by VSET. This
pin is pulled up internally if left floating.
A capacitor may be added between FB and GND to improve noise rejection. Value needs to be limited to
100pF or less.
VCC enable level setting for LED-open protection activation.
Used in conjunction with VCC to determine
1. If LED-open is activated and
2. At what VCC voltage it becomes active
This function prevents false triggering on power up.
Driving output
Input for LED-open detection.
When LED-open detection function is active, if VFAULT is brought lower than approximately 2.5V, the
device output will be turned off and will auto-retry driving the output to see if the fault still exists.
A PWM dimming function will be realized by adding an open collector/drain signal on this pin.
Exposed Pad (Bottom).
Recommended to be connected to a large-area contiguous copper GND plane for effective thermal
dissipation. Do not use as the IC’s only electrical GND connection.
AL5814
Document number: DS40390 Rev. 3 - 2
2 of 14
www.diodes.com
August 2018
© Diodes Incorporated


Part Number AL5814
Description 60V LINEAR DIMMABLE LED CONTROLLER
Maker Diodes
Total Page 14 Pages
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