AL5814

Document number: DS40390 Rev. 3 - 2

1 of 14

www.diodes.com

August 2018

© Diodes Incorporated

AL5814

60V LINEAR DIMMABLE LED CONTROLLER

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.

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 Ant

imony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

1

2

3

6

8

VCC

REF

VSET

SFAULT

VFAULT

OUT

7

4

GND

5

FB

EP

MSOP-8EP

Applications



Automotive Rear Combination Light



LED Signs



Instrumentation Illumination



Refrigerator Lights

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 "g

reen” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.