Diodes AL8806高效30V降压LED驱动方案

Diodes公司的AL8806是高效30V/1.5A降压LED驱动器，可驱动多达8个led，工作电压从6V到30V，LED驱动电流达1.5A，效率高达98%，内置输出开路保护，PWM/DC输入调光控制，主要用在大功率MR16灯，通用照明灯和多芯片LED驱动器。本文介绍了AL8806主要特性，交/直流典型应用电路，MR16灯应用电路，AL8806EV3 评估板和材料清单（BOM）。

AL8806： HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER

The AL8806 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. The AL8806 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 AL8806 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.

AL8806主要特性：

LED driving current up to 1.5A

Better than 5% accuracy

High efficiency up to 98%

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

SOT25 MSOP8-EP: Available in “Green” Molding Compound (No Br, Sb) with lead Free Finish/RoHS Compliant

AL8806应用：

High power MR16 lamps

General illumination lamps

Multi-die LED driver

图1。AL8806典型应用电路（1）

图2。AL8806典型应用电路（2）

图3。MR16应用电路

图4。AL8806EV3 评估板外形图（顶视图）

AL8806EV3 评估板材料清单（BOM）：