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AL8843

40V 3A STEP-DOWN LED DRIVER

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Description

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.

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.

Feature(s)

  • 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)

Application(s)

  • LED Retrofit for Low Voltage Halogen 
  • Low Voltage Industrial Lighting
  • LED Backlighting
  • Illuminated Signs
  • External Driver with Multiple Channels

Product Specifications

Product Parameters

AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Topologies (Buck) Yes
Topologies (Buck-Boost) No
Topologies (Boost) No
MinimumInput Voltage (V) 4.5 V
MaximumInput Voltage (V) 40 V
Maximum Output Voltage (V) 36 V
Maximum LED Current (A) 3 A
LED Current Accuracy (%) 4 %
Switching Frequency Maximum (kHz) 1000 kHz
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency (%) 95 %
OperatingTemperatureRange  (°C) -40 to 105 °C
Sense Voltage (mV) 100 mV
AEC-Q100 Grade No

Related Content

Packages

Technical Documents

SPICE Model

Calculators

Evaluation Boards and User Guides

Recommended Soldering Techniques

TN1.pdf

Orderable Part Number Buy from Distributor / Contact Sales Request Samples
AL8843QSP-13

AL8843QSP-13

Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Farnell, An Avnet Company 2165 10/3/2022 England Buy Now
Mouser Electronics Inc. 108337 10/3/2022 South America, North America, Asia, Europe, Middle East Buy Now
Digi-Key Electronics 83379 10/2/2022 Europe, Asia, North America Buy Now
Request Sample
AL8843SP-13

AL8843SP-13

Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Arrow Electronics 2450 10/3/2022 United States Buy Now
Mouser Electronics Inc. 1866 10/3/2022 South America, North America, Asia, Europe, Middle East Buy Now
RS Components - Spain 2050 10/3/2022 Spain Contact Sales
RS Components - UK 2050 10/3/2022 England Buy Now
Digi-Key Electronics 12130 10/2/2022 Europe, Asia, North America Buy Now
Request Sample

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2585 2022-06-08 2022-09-08 Qualified Additional Assembly/Test (A/T) Sites, Wafer Fab IMD Backend, and Package Outline Dimension Change