AL8805
HIGH EFFICIENCY 36V 1A BUCK LED DRIVER
Description
The AL8805 is a step-down DC/DC converter designed to drive L...
AL8805
HIGH EFFICIENCY 36V 1A BUCK LED DRIVER
Description
The AL8805 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 36V. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The AL8805 switches at frequency up to 1MHz. This allows the use of small size external components, hence minimizing the PCB area needed.
Maximum output current of AL8805 is set via an external resistor connected between the VIN and SET input pins. Dimming is achieved by applying either a 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.
Pin Assignments
(Top View)
SW 1 GND 2 CTRL 3
5 VIN 4 SET
SOT25
Features
LED Driving Current up to 1A Better than 5% Accuracy H...