AL8863 60V BUCK LED CONTROLLER WITH FAULT FLAG Description Pin Assignments The AL8863 is a step-down DC/DC controller designed to drive LEDs with high output current. The device operates at an input supply (Top View) voltage from 4.5V to 60V. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating OSP 1 8 CSN the need for ballast resistors. The switching frequency range of 2 FAULT DIM 7 AL8863 is from 50kHz to 1MHz. The wide operating frequency range EP allows more flexibility on component selection, and also with 3 6 NTC VIN operating up to 1MHz, it allows the use of smaller size external 4 GND 5 DRV components, hence minimizing the PCB size and driver board. SO-8EP The output current of AL8863 is set via an external resistor connected between the VIN and CSN input pins. Dimming is achieved by Applications applying a PWM signal at the DIM input pin. The soft-start time can be adjusted using an external capacitor from the DIM pin to ground. Commercial & Industrial Lighting Architecture Lighting The AL8863 is available in the thermally enhanced SO-8EP package. External LED Drivers and Smart Lighting Features Wide Input Voltage Range: 4.5V to 60V Operating Frequency Range: 50kHz to 1MHz 1000:1 PWM Dimming Resolution at 100Hz Single Pin for On/Off and Brightness Control by PWM Signal Fault Status Indication for Abnormal Operation LED Shorted Protection Inherent Open-Circuit LED Protection Programmable Thermal Fold-Back Operation Through NTC Pin Over Temperature Shutdown Thermally Enhanced SO-8EP Package 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) & 2015/863/EU (RoHS 3) compliant. 2. See AL8863 Typical Applications Circuit VIN R1 R3 VIN CSN DIM D1 R4 OSP NTC L1 AL8863 C1 GND FAULT R2 Q1 DRV EP Pin Descriptions Pin Number Pin Name Function 1 OSP Output Shorted Protection Multi-function On/Off and brightness control pin: Leave floating for normal operation Drive to voltage below 0.3V to turn off output current 2 DIM 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 time less than 1s) 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 3 NTC Connect a NTC resistor to GND to set thermal fold-back break point 4 GND Ground 5 DRV Gate Driver Input voltage (4.5V to 60V). Decouple to ground with 10F or higher X7R ceramic capacitor close to 6 VIN device. 7 FAULT Fault Report Pin. Asserted Low to report faulty conditions. Needs an external pull-up resistor. Current sense negative input. Connect current sense resistor from VIN to CSN for high-side current 8 CSN sense control Exposed pad. Connect to GND and thermal mass for enhanced thermal impedance. Should not be used 9 EP as electrical ground conduction path. 2 of 13 August 2019 AL8863 Diodes Incorporated www.diodes.com Document number: DS42198 Rev. 1 - 2 NEW PRODUCT