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Diodes AL8806高效30V降壓LED驅動方案

2011-04-11
作者:Diodes公司

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):

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