Diodes公司的AL8806是高效30V/1.5A降壓LED驅動器，可驅動多達8個led，工作電壓從6V到30V，LED驅動電流達1.5A，效率高達98%，內置輸出開路保護，PWM/DC輸入調光控制，主要用在大功率MR16燈，通用照明燈和多芯片LED驅動器。本文介紹了AL8806主要特性，交/直流典型應用電路，MR16燈應用電路，AL8806EV3 評估板和材料清單（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應用：
High power MR16 lamps
General illumination lamps
Multi-die LED driver
Diodes公司的AL8806是高效30V/1.5A降壓LED驅動器，可驅動多達8個led，工作電壓從6V到30V，LED驅動電流達1.5A，效率高達98%，內置輸出開路保護，PWM/DC輸入調光控制，主要用在大功率MR16燈，通用照明燈和多芯片LED驅動器。本文介紹了AL8806主要特性，交/直流典型應用電路，MR16燈應用電路，AL8806EV3 評估板和材料清單（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應用：
High power MR16 lamps
General illumination lamps
Multi-die LED driver
圖1。AL8806典型應用電路（1）
圖2。AL8806典型應用電路（2）
圖3。MR16應用電路
圖4。AL8806EV3 評估板外形圖（頂視圖）
AL8806EV3 評估板材料清單（BOM）：
