AL8808

NEW PRODUCT AL8808 COST EFFECTIVE LOW EMI 30V 1A BUCK LED DRIVER Description The AL8808 is a step-down DC/DC converter designed to drive LEDs with a constant current. The device can drive up to 8 LEDs, depending on the forward voltage of the LEDs, in series from a voltage source of 6V to 30V. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The AL8808 switches at frequency up to 1MHz with controlled rise and fall times to reduce EMI. This allows the use of small size external components, hence minimizing the PCB area needed. Maximum output current of AL8808 is set via an external resistor connected between the VIN and SET input pins. Dimming is achieved by applying either an analog DC voltage or a PWM signal at the CTRL input pin. An input voltage of 0.4V or lower at CTRL switches off the output MOSFET simplifying PWM dimming. Applications MR16 Lamps General Illumination Lamps Pin Assignments (Top View) SW 1 GND 2 5 VIN CTRL 3 4 SET TSOT25 Features LED Driving Current Up to 1A Better Than 5% Accuracy High Efficiency Up to 96% Fast Controlled Falling Edges 7ns Operating Input Voltage from 6V to 30V High Switching Frequency Up to 1MHz PWM/DC Input for Dimming Control Built-In Output Open-Circuit Protection Built-In Over-Temperature Protection TSOT25: Available in “Green” Molding Compound (No Br, Sb) ƒ Totally Lead-Free & Fully RoHS Compliant (Notes 1 & ...