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参数资料
| 型号： | MIC3291-18YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC PWM WLED DVR 1.8V 1.2MHZ 8MLF |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz ~ 1.35MHz |
| 电源电压： | 2.5 V ~ 6.5 V |
| 输出电压： | 可调 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘，8-MLF? |
| 供应商设备封装： | 8-MLF?（2x2） |
| 包装： | 标准包装 |
| 其它名称： | 576-3860-6 |
Micrel, Inc.
Figure 11. One step Brightness Increase
Presetting Brightness
The brightness level can be preset before the MIC3291
begins to drive the LEDs by sending a series of
programming edges via the DC pin during the t START_UP
(140μs) period and between 35μs to 50μs after the DC
pin is first pulled HIGH. The 15μs timeframe between
35μs and 50μs is the t PROG_SETUP period. The MIC3291
does not drive current into the load until DC pin is kept
HIGH for t START_UP (140μs) after presetting has concluded
in order to grant the user sufficient time to preset LED
brightness. The first presetting pulse edge must occur
somewhere between the timeframe of 35μs to 50μs after
DC pin is first pulled HIGH otherwise the MIC3291 may
continue to start at the full (default) brightness level.
Figure 12. Preset Timing
MIC3291
Figure 12 shows the correct presetting sequence to set
the MIC3291 brightness to Level 6 prior to startup. The
sequence is initiated by driving the DC pin LOW for a
period exceeding t SHUTDOWN (1260μs) to insure that the
part has entered the power saving shutdown state
erasing all brightness level state and mode setting. Then
the DC pin is driven HIGH and the first presetting pulse
edge is entered within the t PROG_SETUP window. Notice
that when using the presetting feature the first
programming pulse is not ignored. This is because the
counter’s default mode is count down and a mode
change cannot be performed in the presetting mode.
(Note that the same timing requirements of standard
brightness programming also apply during presetting
brightness.)
September 2010
12
M9999-092810
(408) 944-0800
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC3291-25YD6 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with Internal Schottky Diode and Single-Wire Linear Brightness Control |
| MIC3291-25YD6 TR | 功能描述:LED照明驱动器 1.2MHz PWM WLED Driver w/Internal Schottky Diode & Single-Wire Linear Brightness Control (Lead Free) 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 |
| MIC3291-25YM6 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with Internal Schottky Diode and Single-Wire Linear Brightness Control |
| MIC3291-25YML TR | 功能描述:LED照明驱动器 1.2MHz PWM WLED Driver w/Internal Schottky Diode & Single-Wire Linear Brightness Control (Lead Free) 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 |
| MIC3291-25YML-TR | 功能描述:LED 驱动器 IC 1 输出 DC DC 稳压器 升压（升压） 1.2A（开关） 8-MLF?（2x2） 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 类型:DC DC 稳压器 拓扑:升压（升压） 内部开关:是 输出数:1 电压 - 供电（最低）:2.5V 电压 -?供电（最高）:6.5V 电压 - 输出:- 电流 - 输出/通道:1.2A（开关） 频率:1.2MHz 调光:- 应用:背光 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 供应商器件封装:8-MLF?（2x2） 标准包装:1 |
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