AL8863 CONTROLLER Datasheet

AL8863 Datasheet PDF, Equivalent


Part Number

AL8863

Description

60V BUCK LED CONTROLLER

Manufacture

Diodes

Total Page 13 Pages
PDF Download
Download AL8863 Datasheet PDF


AL8863
AL8863
60V BUCK LED CONTROLLER WITH FAULT FLAG
Description
The AL8863 is a step-down DC/DC controller designed to drive LEDs
with high output current. The device operates at an input supply
voltage from 4.5V to 60V. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness and eliminating
the need for ballast resistors. The switching frequency range of
AL8863 is from 50kHz to 1MHz. The wide operating frequency range
allows more flexibility on component selection, and also with
operating up to 1MHz, it allows the use of smaller size external
components, hence minimizing the PCB size and driver board.
The output current of AL8863 is set via an external resistor connected
between the VIN and CSN input pins. Dimming is achieved by
applying a PWM signal at the DIM input pin. The soft-start time can
be adjusted using an external capacitor from the DIM pin to ground.
The AL8863 is available in the thermally enhanced SO-8EP package.
Pin Assignments
(Top View)
OSP 1
DIM 2
NTC 3
GND 4
EP
8 CSN
7 FAULT
6 VIN
5 DRV
SO-8EP
Applications
Commercial & Industrial Lighting
Architecture Lighting
External LED Drivers and Smart Lighting
Features
Wide Input Voltage Range: 4.5V to 60V
Operating Frequency Range: 50kHz to 1MHz
1000:1 PWM Dimming Resolution at 100Hz
Single Pin for On/Off and Brightness Control by PWM Signal
Fault Status Indication for Abnormal Operation
LED Shorted Protection
Inherent Open-Circuit LED Protection
Programmable Thermal Fold-Back Operation Through NTC Pin
Over Temperature Shutdown
Thermally Enhanced SO-8EP Package
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.
AL8863
Document number: DS42198 Rev. 1 - 2
1 of 13
www.diodes.com
August 2019
© Diodes Incorporated

AL8863
Typical Applications Circuit
VIN
C1
R2
VIN
DIM
R1
CSN
NTC
OSP
AL8863
GND
FAULT
EP DRV
R3
R4
D1
L1
Q1
AL8863
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
Pin Name
OSP
DIM
NTC
GND
DRV
VIN
FAULT
CSN
EP
Function
Output Shorted Protection
Multi-function On/Off and brightness control pin:
Leave floating for normal operation
Drive to voltage below 0.3V to turn off output current
Drive with an analog voltage >2.6V, output current will be 100% of IOUT_NOM
A PWM signal (Low level <0.3V, High level >2.6V, transition time less than 1µs) allows the output
current to be adjusted over a wide range up to 100%
Connect a capacitor from this pin to ground to increase soft-start time
Connect a NTC resistor to GND to set thermal fold-back break point
Ground
Gate Driver
Input voltage (4.5V to 60V). Decouple to ground with 10μF or higher X7R ceramic capacitor close to
device.
Fault Report Pin. Asserted Low to report faulty conditions. Needs an external pull-up resistor.
Current sense negative input. Connect current sense resistor from VIN to CSN for high-side current
sense control
Exposed pad. Connect to GND and thermal mass for enhanced thermal impedance. Should not be used
as electrical ground conduction path.
AL8863
Document number: DS42198 Rev. 1 - 2
2 of 13
www.diodes.com
August 2019
© Diodes Incorporated


Features NEW PRODUCT AL8863 60V BUCK LED CONTROL LER WITH FAULT FLAG Description The AL 8863 is a step-down DC/DC controller de signed to drive LEDs with high output c urrent. The device operates at an input supply voltage from 4.5V to 60V. Serie s connection of the LEDs provides ident ical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The switching frequ ency range of AL8863 is from 50kHz to 1 MHz. The wide operating frequency range allows more flexibility on component s election, and also with operating up to 1MHz, it allows the use of smaller siz e external components, hence minimizing the PCB size and driver board. The out put current of AL8863 is set via an ext ernal resistor connected between the VI N and CSN input pins. Dimming is achiev ed by applying a PWM signal at the DIM input pin. The soft-start time can be a djusted using an external capacitor fro m the DIM pin to ground. The AL8863 is available in the thermally enhanced SO-8EP package. Pin Assign.
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