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AL8806
Application Information (cont.)
PWM Dimming
LED current can be adjusted digitally, by applying a low frequency Pulse Width Modulated (PWM) logic signal to the CTRL pin to turn the device on
and off. This will produce an average output current proportional to the duty cycle of the control signal. In particular, a PWM signal with a max
resolution of 10bit can be applied to the CTRL pin to change the output current to a value below the nominal average value set by resistor R SET . To
achieve this resolution the PWM frequency has to be lower than 500Hz, however higher dimming frequencies can be used - at the expense of
dimming dynamic range and accuracy.
Typically, for a PWM frequency of 500Hz the accuracy is better than 1% for PWM ranging from 1% to 100%.
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PWM dimming [%]
Figure 2 PWM Dimming at 500Hz
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Figure 3 Low Duty Cycle PWM Dimming at 500Hz
The PWM pin is designed to be driven by both 3.3V and 5V logic levels directly from a logic output with either an open drain output or push-pull
output stage.
AL8806
Document number: DS35144 Rev. 5 - 2
8 of 15
www.diodes.com
July 2013
? Diodes Incorporated
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相关代理商/技术参数
AL8806QMP-13
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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
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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
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AL8807BMP-13
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