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AL8806
Application Information (cont.)
Application Example (cont.)
The output of the 12V transformer is fed into the bridge rectifier, comprising of D2, D3, D4 and D5. C10 offers an optional EMI filtering at the input.
(see figure 9)
Capacitor, C BULK , (capacitors C1 and C2 on the PCB and BOM are multiple components to reduce size) forms the bulk reservoir capacitance -
used to sustain operation of the device during the low part of the rectified AC wave. In the case of a system driving two LEDs at 1.1A, one 470μF
plus 47μF capacitors are required.
Capacitors C3 and C9 provide local decoupling for the AL8806 and for the schottky freewheeling diode, D1. It is important that C3 is as close as
possible to the AL8806’s V IN pin and that C9 is as close to the V IN and shottky diode as possible, as reflected in the layout shown below in figure 8.
The LED current is determined by the total resistance between the V IN and SET pins (R1 and R2 in figures 7 (schematic) and 8 (top PCB) and
BOM).
C4 decouples the LED connections, again to minimize EMI, as well as smoothing the current.
D1 operates as the freewheeling diode, providing a current path for the LED current when the power switch at SW pin is off.
Capacitors C5 to C9, 1.5nF have been added to improve the overall EMI performance. C5 is connected across the Supply pins to reduce radiation
via the wiring. C6 and C7 also assist the reduction of EMI via the wiring. C8 snubs high frequency radiation from the harmonics in the switching
regulator.
A large number of vias have been used to improve the grounding effect throughout the PCB to improve the evaluation board’s EMI performance.
Figure 8 AL8806EV6 evaluation board (Top)
Figure 9 AL8806EV6 evaluation board (Bottom)
AL8806
Document number: DS35144 Rev. 5 - 2
12 of 15
www.diodes.com
July 2013
? Diodes Incorporated
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相关代理商/技术参数
AL8806QMP-13
功能描述:LED 驱动器 IC 1 输出 DC DC 稳压器 降压（降压） 模拟，PWM 调光 1.5A（开关） 8-MSOP-EP 制造商:diodes incorporated 系列:汽车级，AEC-Q100 包装:剪切带（CT） 零件状态:有效 类型:DC DC 稳压器 拓扑:降压（降压） 内部开关:是 输出数:1 电压 - 供电（最低）:6V 电压 -?供电（最高）:30V 电压 - 输出:36V 电流 - 输出/通道:1.5A（开关） 频率:1MHz 调光:模拟，PWM 应用:汽车级 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸焊盘 供应商器件封装:8-MSOP-EP 标准包装:1
AL8807
制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER
AL8807A
制造商:未知厂家 制造商全称:未知厂家 功能描述:The AL8807A is a step-down DC/DC converter designed to drive
LEDs with a constant current
AL8807AEV1
功能描述:AL8807A 1, Non-Isolated Output LED Driver Evaluation Board 制造商:diodes incorporated 系列:- 零件状态:有效 电流 - 输出/通道:680mA 输出和类型:1，非隔离 电压 - 输出:- 特性:可调光 电压 - 输入:6 V ~ 36 V 所含物品:板 使用的 IC/零件:AL8807A 标准包装:1
AL8807AEV3
功能描述:AL8807A 1, Non-Isolated Output LED Driver Evaluation Board 制造商:diodes incorporated 系列:- 零件状态:有效 电流 - 输出/通道:1A 输出和类型:1，非隔离 电压 - 输出:- 特性:可调光 电压 - 输入:6 V ~ 36 V 所含物品:板 使用的 IC/零件:AL8807A 标准包装:1
AL8807AMP-13
功能描述:LED照明驱动器 High EFF DIMM 36V 1A / 1.3A Buck LED
RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
AL8807AW5-7
功能描述:LED照明驱动器 High EFF Low EMI 36V 1A Buck LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
AL8807BMP-13
功能描述:LED 驱动器 IC 1 输出 DC DC 稳压器 降压（降压） PWM 调光 1.3A（开关） 8-MSOP-EP 制造商:diodes incorporated 系列:- 包装:带卷（TR） 零件状态:有效 类型:DC DC 稳压器 拓扑:降压（降压） 内部开关:是 输出数:1 电压 - 供电（最低）:6V 电压 -?供电（最高）:36V 电压 - 输出:40V 电流 - 输出/通道:1.3A（开关） 频率:1MHz 调光:PWM 应用:- 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸焊盘 供应商器件封装:8-MSOP-EP 标准包装:2,500