Buck LED driver designed to drive LEDs with a constant current

Diodes Incorporated AL8862 Buck LED Driver is a step-down DC-DC converter created to drive LEDs with a constant current. The device works with an input supply voltage from 5V to 60V, and it gives an externally adjustable output current up to 1A. Series connection of the LEDs offers identical LED currents appearing in uniform brightness and removing the requirement for ballast resistors. The device switches at frequency up to 1MHz, enabling the employment of smaller size external components and minimising needed PCB size.

The device combines a low RDS(ON) power switch and a high-side output current sensing circuit. The maximum output current of the device is set by an external resistor connected between the VIN and SET input pins. Dimming is accomplished by applying either a DC voltage or a PWM signal at the CTRL input pin.

The device is offered in a thermally enhanced SO-8EP package, with a -40C to +105C operating ambient temperature range.

Typical applications include commercial and industrial lighting, appliances interior lighting, architecture detail lighting, and external driver with multiple channels and smart lighting.