Diodes Incorporated AL8862Q | Demoboard AL8862QEV2

Description

The DIODES AL8862Q is a step-down DC-DCconverter designed to drive LEDs with aconstant current. The AL8862Q operates withan input supply voltage from 5V to 55V andprovides an externally adjustable outputcurrent up to 1A. Series connection of theLEDs provides identical LED currents resultingin uniform brightness and eliminating theneed for ballast resistors. The AL8862Qswitches at frequencies up to 1MHz. Thisallows for the use of smaller size externalcomponents, hence minimizing the PCB size.The AL8862Q integrates the power switch anda high-side output current sensing circuit. Themaximum output current of AL8862Q is setvia an external resistor connected betweenthe VIN and SET input pins. Dimming isachieved by applying either a DC voltage or aPWM signal at the CTRL input pin. The soft-start time can be adjusted using an externalcapacitor from the CTRL pin to the ground. Aninput voltage of 0.3V or lower at CTRL pin willshut down the power switch.

Features

• 2.0V to 60V Wide Input Voltage Range
  • Wide Input Voltage Range: 5V to 55V
  • Output Current up to 1A
  • Internal 55V NDMOS Switch
  • Typical 4% Output Current Accuracy
  • Single Pin for On/Off and Brightness Control by DC Voltage or
  • PWM Signal
  • High Efficiency (Up to 97%)
  • Fault Status Indication for Abnormal Operation
  • LED Short-Circuit Protection
  • Inherent Open-Circuit LED Protection
  • Current-Sense Resistor Short-Circuit Protection
  • Overtemperature Shutdown
  • Up to 1MHz Switching Frequency
  • SO-8EP Package Available in Green Molding Compound (No Br, Sb)

Typical applications

More information

• Datasheet
• IC product information