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| 型号： | MIC3289-16YD6 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT TSOT-6 |
| 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，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz ~ 1.35MHz |
| 电源电压： | 2.5 V ~ 6.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | TSOT-23-6 |
| 包装： | 剪切带 (CT) |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1082 (CN2011-ZH PDF) |
| 其它名称： | 576-3001-1 |
Micrel, Inc.
DC:
Edge Ignored
MIC3289
UP
COUNT
10
10
11
12
13
14
15
0
1
2
3
4
15
OUTPUT
LEVEL
0
Figure 9. Up Counter Roll-over
One-Step Brightness Changes
For applications where a keypad button press is to be
translated into a brightness level change, the following
method of decreasing the brightness level may be
useful. This “One-Step” brightness change procedure
relieves the user from keeping track of the MIC3289’s
up/down counter state. It combines a counter mode
change with a programming pulse, therefore a one-step
decrease in brightness is assured no matter what the
previous up/down counter mode was.
Figure 11. One-Step Brightness Increase
Presetting Brightness
The brightness level can be preset before the MIC3289
begins to drive the LEDs by sending a series of
programming edges via the DC pin during the t START_UP
(140μs) period and within 35μs to 50μs after the DC pin
is pulled high. The 15μs timeframe between 35μs and
50μs is the t PROG_SETUP period. The MIC3289 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 MIC3289 may
continue to start at the full (default) brightness level.
Figure 10. One-Step Brightness Decrease
This method is quite simple and the only requirement is
that the first DC low period be equal to the t MODE_DOWN
(420μs to 500μs) and immediately followed by a falling
edge within t PROG_HIGH (1μs to 32μs) as shown in Figure
10 for One-Step Brightness Decrease. Similarly a one-
step 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 (1μs to 32μs). Figure 11 illustrates the
proper timing for execution of a One-Step Brightness
Increase.
Figure 12. Presetting Timing
Figure 12 shows the correct presetting sequence to set
the MIC3289 brightness to level 6 prior to start up. 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.)
June 2007
11
M9999-061807
(408) 944-0800
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC3289-16YML | 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 True 1-Wire Digital Control |
| MIC3289-16YML TR | 功能描述:直流/直流开关调节器 1.2MHz 0.5A Switch WLED Driver with Digital Brightness Control (lead free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC3289-16YML-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:有效 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 |
| MIC3289-24YD6 | 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 True 1-Wire Digital Control |
| MIC3289-24YD6 TR | 功能描述:直流/直流开关调节器 1.2MHz 0.5A Switch WLED Driver with Digital Brightness Control (lead free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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