AL8862FF-7 Diodes Incorporated

AL8862 60V 1A STEP-DOWN LED DRIVER Description Pin Assignments (Top View) The AL8862 is a step-down DC/DC converter designed to drive LEDs with a constant current. The AL8862 operates with an input supply voltage from 5V to 60V and provides an externally adjustable output SET 1 8 CTRL current up to 1A. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need GND GND 2 7 EP for ballast resistors. The AL8862 switches at frequency up to 1MHz. 3 SW NC 6 This allows the use of smaller size external components, hence minimizing the PCB size. VIN 5 SW 4 The AL8862 integrates the power switch and a high-side output SO-8EP current sensing circuit. Maximum output current of AL8862 is set via an external resistor connected between the VIN and SET input pins. Applications Dimming is achieved by applying either a DC voltage or a PWM signal at the CTRL input pin. The soft-start time can be adjusted using Commercial & Industrial Lighting an external capacitor from the CTRL pin to ground. An input voltage Appliances Interior Lighting of 0.3V or lower at CTRL pin will shut down the power switch. Architecture Detail Lighting External Driver with Multiple Channels and Smart Lighting Features Wide Input Voltage Range: 5V to 60V Output Current up to 1A Internal 60V 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%) LED Short-Circuit Protection Inherent Open-Circuit LED Protection Current-Sense Resistor Short-Circuit Protection Over Temperature Shutdown 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 AL8862 Typical Applications Circuit R SET V : 5-60V IN VIN SET C1 CTRL D1 AL8862 GND SW L1 Pin Descriptions Pin Number Pin Name Function Set Nominal Output Current Pin. Connect resistor R from this pin to VIN to define nominal average SET 1 SET output current. 2,7 GND Ground of IC 3 NC No connection Input voltage (5V to 60V). Decouple to ground with 10F or higher X7R ceramic capacitor close to 4 VIN device. 5,6 SW Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI. 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 DC voltage (0.4V < VSET< 2.5V) to adjust output current from 10% to 100% of I OUT NOM 8 CTRL Drive with an analog voltage >2.6V output current will be 100% of I OUT NOM A PWM signal (Low level <0.3V, High level >2.6V, transition times less than 1us) 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. (Default soft-start time = 0.1ms. Additional soft-start time is approx. 1.5ms/1nF) EP EP Exposed pad/TAB connects to GND and thermal mass for enhanced thermal impedance. 2 of 16 December 2017 AL8862 Diodes Incorporated www.diodes.com Document number: DS40375 Rev. 1 - 2 NEW PRODUCT