AL8843
40V 3A STEP-DOWN LED DRIVER
Description
Pin Assignments
(Top View)
NEW PRODUCT
The AL8843 is a hysteresis mode DC-DC step-down converter,
designed for driving single or multiple series connected LEDs
efficiently from a voltage source higher than the LED voltage. The
device can operate from an input supply between 4.5V and 40V and
provide an externally adjustable output current up to 3A. Depending
upon supply voltage and external components, this converter can
provide up to 60W of output power.
The AL8843 integrates the power switch and a high-side output
current sensing circuit, which uses an external resistor to set the
nominal average output current.
8
SW
7
SW
3
6
VIN
4
5
CTRL
GND
1
GND
2
SET
NC
EP
SO-8EP
Dimming can be realized by applying an external control signal to the
CTRL Pin. The CTRL Pin will accept either a DC voltage signal or a
PWM signal.
The soft-start time can be adjusted by an external capacitor from the
CTRL Pin to Ground. Applying a voltage of 0.3V or lower to the CTRL
Pin will shut down the power switch.
Features
Applications
LED Retrofit for Low Voltage Halogen
Low Voltage Industrial Lighting
LED Backlighting
Illuminated Signs
External Driver with Multiple Channels
Wide Input Voltage Range: 4.5V to 40V
Output Current up to 3A
Internal 40V NDMOS Switch
Typical 4% Output Current Accuracy
Single Pin for On/Off and Brightness Control by DC Voltage or
PWM Signal
Recommended Analog Dimming Range: 10% to 100%
Soft-Start
High Efficiency (Up to 97%)
LED Short Protection
Inherent Open-Circuit LED Protection
Over Temperature Protection (OTP)
Up to 1MHz Switching Frequency
SO-8EP Packages Available in Green Molding Compound (No
Br, Sb)
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) compliant.
2. See http://www.diodes.com/quality/lead_free.html 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
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