AL9902S16-13 Diodes Incorporated

AL9902 LINEAR AND PWM DIMMING HIGH VOLTAGE LED DRIVER Description Pin Assignments The AL9902 high-voltage PWM LED driver provides an efficient SW NC SO GND CS VIN solution for offline high-brightness LED lamps from rectified line 12 11 10 9 12 8 77 voltages ranging from 85V up to 277V . The AL9902 has an AC AC internal MOSFET that allows switching frequencies up to 300kHz, with the switching frequency determined by an external single EP1 EP2 resistor. The AL9902 topology creates a constant current through the LEDs providing constant light output. The output current is programmed by one external resistor. 5 111 2 3 4 6666 The LED brightness can be varied by both linear and PWM dimming NC NC PWM VDD LD Rosc using the AL9902s LD and PWM pins respectively. The PWM input U-DFN6040-12 operates with duty ratio of 0-100% and frequency of up to several kHz. NC SO NC NC GND CS NC VIN The AL9902 is available in the thermally enhanced U-DFN6040-12 16 15 14 11 10 13 12 9 and SO-16 packages. Features >90% Efficiency Universal Rectified 85 to 277V Input Range AC Internal MOSFET Up to 650V, 2A 1 2 3 5 6 7 4 8 High Switching Frequency Up to 300kHz PWM NC NC SW NC VDD LD Rosc Internal Voltage Regulator Removes Start-Up Resistor SO-16 7.5V Regulated Output Tighter Current Sense Tolerance Better Than 5% LED Brightness Control with Linear and PWM Dimming Applications Internal Over-Temperature Protection (OTP) LED Offline Lamps U-DFN6040-12 and SO-16 Packages Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2) High Voltage DC-DC LED Driver Halogen and Antimony Free. Green Device (Note 3) Signage and Decorative LED Lighting Back Lighting of Flat Panel Displays General Purpose Constant Current Source Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See AL9902 Pin Descriptions Pin Name U-DFN5040-10 SO-16 Functions NC 1 14 No connection NC 2 1, 2, 4, 10,16 No connection PWM 3 5 Low Frequency PWM Dimming pin, also Enable input. Internal 200k pull-down to GND Internally regulated supply voltage. 7.5V nominal. V 4 DD 6 Can supply up to 1 mA for external circuitry. A sufficient storage capacitor is used to provide storage when the rectified AC input is near the zero crossing. Linear Dimming input. Changes the current limit threshold at current sense comparator and LD 5 changes the average LED current. 7 Oscillator control. R 6 A resistor connected between this pin and ground puts the AL9902 into fixed frequency mode and OSC 8 sets the switching frequency. 7 9 Input voltage V IN CS 8 11 Senses LED string and internal MOSFET switch current GND 9 12 Device ground NC 11 13 No connection SO 10 15 Source of the internal MOSFET Switch SW 12 3 Drain of the internal MOSFET switch. EP1 EP1 NA Exposed Pad 1(bottom). Drain connection of internal power MOSFET. NA Exposed Pad 2 (bottom). Substrate connection of control IC. Connect to GND directly underneath EP2 EP2 the package and large PCB area to minimize junction to ambient thermal impedance. Functional Block Diagram & Typical Application VIN D1 VIN Rosc LDO 7.5V OSC VDD VDD SW 250mV S Rosc R LD SO CS OTP Rsense PWM 200K AL9902 GND 2 of 18 AL9902 July 2015 Diodes Incorporated www.diodes.com Document number: DS37878 Rev. 1 - 2