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参数资料
| 型号： | AL8807W5-7 |
| 厂商： | Diodes Inc |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR DCDC BUCK SOT25 |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 6 V ~ 36 V |
| 输出电压： | 36V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-25 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | AL8807W5-7DIDKR |
AL8807
Application Information (cont.)
EMI and Layout Considerations
The AL8807 is a switching regulator with fast edges and measures small differential voltages; as a result of this care has to be taken with
decoupling and layout of the PCB.To help with these effects the AL8807 has been developed to minimise radiated emissions by controlling the
switching speeds of the internal power MOSFET. The rise and fall times are controlled to get the right compromise between power dissipation due
to switching losses and radiated EMI. The turn-on edge (falling edge) dominates the radiated EMI which is due to an interaction between the
Schottky diode (D1), Switching MOSFET and PCB tracks. After the Schottky diode reverse recovery time of around 5ns has occurred; the falling
edge of the SW pin sees a resonant loop between the Schottky diode capacitance and the track inductance, L TRACK , See figure 36.
Figure 36 PCB Loop Resonance
The tracks from the SW pin to the Anode of the Schottky diode, D1, and then from D1’s cathode to the decoupling capacitors C1 should be as short
as possible. There is an inductance internally in the AL8807 this can be assumed to be around 1nH. For PCB tracks a figure of 0.5nH per mm can
be used to estimate the primary resonant frequency. If the track is capable of handling 1A increasing the thickness will have a minor effect on the
inductance and length will dominate the size of the inductance.
The resonant frequency of any oscillation is determined by the combined
inductance in the track and the effective capacitance of the Schottky diode. An example of good layout is shown in figure 37 - the stray track
inductance should be less than 5nH.
Figure 37 Recommended PCB Layout
AL8807
Document number: DS35281 Rev. 5 - 2
14 of 20
www.diodes.com
March 2013
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AL8808EV1 | 功能描述:AL8808 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 ~ 30 V 所含物品:板 使用的 IC/零件:AL8808 标准包装:1 |
| AL8808EV2 | 功能描述:AL8808 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:- 电压 - 输入:12VAC，12 V ~ 20 V 所含物品:板 使用的 IC/零件:AL8808 标准包装:1 |
| AL8808WT-7 | 功能描述:LED照明驱动器 LED MV Int Switch TS Switch TSOT25 T&R 3K 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 |
| AL8811 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:Boost/Buck/Inverting DC-DC CONVERTER |
| AL8811M8-13 | 制造商:Diodes Incorporated 功能描述:LED LV INT SWITCH MSOP-8 T&R 2.5K - Tape and Reel 制造商:Diodes Incorporated 功能描述:LED MV INT SWITCH MSOP-8 |
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