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参数资料
| 型号： | MIC2846A-MFYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 14TMLF |
| 标准包装： | 1 |
| 拓扑： | 线性（LDO） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-UFQFN 裸露焊盘，14-TMLF? |
| 供应商设备封装： | 14-TMLF?（2.5x2.5） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1082 (CN2011-ZH PDF) |
| 其它名称： | 576-3477-6 |
Micrel Inc.
Similarly, when the counter mode is set to Count Up and
a programming pulse forces the brightness level to step
up from level 48, then the counter will roll-over to level 0
as illustrated in Figure 13.
MIC2846A
Presetting Brightness
Presetting the brightness will allow the MIC2846A to
start-up at any brightness level (0 to 48). The MIC2846A
does not turn on the linear LED driver until the DC pin is
kept high for t START_UP (140μs). This grants the user time
to preset the brightness level by sending a series of
programming edges via the DC pin. The precise timing
for the first down edge is between 5μs to 75μs after the
DC pin is first pulled high. The 70μs timeframe between
5μs and 75μs is the t PROG_SETUP period. The first
presetting pulse edge must occur somewhere between
the timeframe of 5μs to 75μs, otherwise the MIC2846A
may continue to start up at the full (default) brightness
level.
Figure 13. Up Counter Roll-Over
One-Step Brightness Changes
The “One-Step” brightness change procedure relieves
the user from keeping track of the MIC2846A’s up/down
counter mode. It combines a Mode Change with a
programming edge; therefore, regardless of the previous
Count Mode, it will change the brightness level by one.
Figure 16. Presetting Timing
Figure 16 shows the correct presetting sequence to set
the MIC2846A brightness to level 39 prior to start up.
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
Figure 14. One-Step Brightness Decrease
The One-Step Brightness Decrease method is quite
simple. First, the DC pin is pulled low for a period equal
to the t MODE_DOWN (420μs to 500μs) and immediately
followed by a falling edge within t PROG_HIGH (2μs to 32μs)
as shown in Figure 14. This will decrease the brightness
level by 1. Similarly a One-Step Brightness Increase can
be assured by first generating a DC down pulse whose
period is equal to the t MODE_UP (100μs to 160μs) and
immediately followed by a falling edge within t PROG_HIGH
(2μs to 32μs). Figure 15 illustrates the proper timing for
execution of a One-Step Brightness Increase.
Figure 15. One-Step Brightness Increase
Change cannot be performed in the presetting mode.
(Note that the t PROG_HIGH and t PROG_LOW pulse width must
still be between 2μs to 32μs.)
April 2010
15
M9999-041210-D
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| MIC2846A-MGYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with Digital Control 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 |
| MIC2846A-MGYMT-TR | 功能描述:LED 驱动器 IC 6 输出 线性 20mA 14-TMLF?（2.5x2.5） 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 类型:线性 拓扑:- 内部开关:是 输出数:6 电压 - 供电（最低）:3V 电压 -?供电（最高）:5.5V 电压 - 输出:- 电流 - 输出/通道:20mA 频率:- 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:14-UFQFN 裸露焊盘，14-TMLF? 供应商器件封装:14-TMLF?（2.5x2.5） 标准包装:1 |
| MIC2846A-PGYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with Digital Control 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 |
| MIC2846A-PGYMT-TR | 功能描述:LED 驱动器 IC 6 输出 线性 20mA 14-TMLF?（2.5x2.5） 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 类型:线性 拓扑:- 内部开关:是 输出数:6 电压 - 供电（最低）:3V 电压 -?供电（最高）:5.5V 电压 - 输出:- 电流 - 输出/通道:20mA 频率:- 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:14-UFQFN 裸露焊盘，14-TMLF? 供应商器件封装:14-TMLF?（2.5x2.5） 标准包装:1 |
| MIC2846A-PPYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with Digital Control 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 |
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