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IC manufacturers Diodes Incorporated

Diodes Incorporated AL8843 | Demoboard AL8843EV1

40V 3A STEP-DOWN LED DRIVER

Overview

TopologyBuck Converter
Input voltage4.5-50 V
Switching frequency250-1000 kHz
Output 13 A

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. Thedevice can operate from an input supply between 4.5V and 40V and provide an externally adjustable output current up to 3A. Dependingupon 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 theCTRL 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

  • 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)

Typical applications

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

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