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AL8806
Application Information (cont.)
Soft Start
The AL8806 does not have in-built soft-start action – this provides very fast turn off of the output the stage improving PWM dimming accuracy;
nonetheless, adding an external capacitor from the CTRL pin to ground will provide a soft-start delay. This is achieved by increasing the time taken
for the CTRL voltage to rise to the turn-on threshold and by slowing down the rate of rise of the control voltage at the input of the comparator.
Adding a capacitor increases the time taken for the output to reach 90% of its final value, this delay is 0.1ms/nF, but will impact on the PWM
dimming accuracy depending on the delay introduced.
Figure 4 Soft Start with 22nF Capacitor on CTRL Pin (V IN = 36V, I LED = 667mA, 1 LED)
Reducing Output Ripple
Peak to peak ripple current in the LED(s) can be reduced, if required, by shunting a capacitor C2 across the LED(s) as shown already in the circuit
schematic.
A value of 1 μ F will reduce the supply ripple current by a factor three (approx.). Proportionally lower ripple can be achieved with higher capacitor
values. Note that the capacitor will not affect operating frequency or efficiency, but it will increase
start-up delay, by reducing the rate of rise of
LED voltage. By adding this capacitor the current waveform through the LED(s) changes from a triangular ramp to a more sinusoidal version
without altering the mean current value.
AL8806
Document number: DS35144 Rev. 5 - 2
9 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