AL9902

AL9902 LINEAR AND PWM DIMMING HIGH VOLTAGE LED DRIVER Description The AL9902 high-voltage PWM LED driver provides an efficient solution for offline high-brightness LED lamps from rectified line voltages ranging from 85VAC up to 277VAC. The AL9902 has an internal MOSFET that allows switching frequencies up to 300kHz, with the switching frequency determined by an external single resistor. The AL9902 topology creates a constant current through the LEDs providing constant light output. The output current is programmed by one external resistor. The LED brightness can be varied by both linear and PWM dimming using the AL9902’s LD and PWM pins respectively. The PWM input operates with duty ratio of 0-100% and frequency of up to several kHz. The AL9902 is available in the thermally enhanced U-DFN6040-12 and SO-16 packages. Pin Assignments SW NC SO GND CS VIN 12 11 10 9 8 77 EP1 EP2 11 2 3 4 5 66 NC NC PWM VDD LD Rosc U-DFN6040-12 NC SO NC NC GND CS NC VIN 16 15 14 13 12 11 10 9 Features  >90% Efficiency  Universal Rectified 85 to 277VAC Input Range  Internal MOSFET Up to 650V, 2A  High Switching Frequency Up to 300kHz  Internal Voltage Regulator Removes Start-Up Resistor  7.5V Regulated Output  Tighter Current Sense Tolerance Better Than ±5%  LED Brightness Control with Linear and PWM Dimming  Internal Over-Temperature Protection (OTP)  U-DFN6040-12 and SO-16 Packages  Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2)  Halogen and Antimony Free. “Green” Device (No...