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| 型号： | MIC3291-25YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC PWM WLED DVR 2.5V 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： | 576-3861-6 |
Micrel, Inc.
To maintain operation at the current brightness level
simply maintain a logic level high signal at the DC pin.
Figure 7. Decreasing Brightness Several Levels
Figure 9. Up Counter Rollover
One Step Brightness Changes
MIC3291
As mentioned, MIC3291 can be programmed to set LED
drive current to produce one of 16 distinct brightness
levels. The internal logic keeps track of the brightness
level with an up/down counter circuit. The Counter
Rollover section explains how the brightness counter
functions with continued programming edges.
Counter Rollover
The MIC3291 internal up/down counter contains
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 MIC3291’s
up/down counter mode. 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.
registers from 0 to 15. When the brightness level is at 0
and a programming pulse forces the brightness to step
down, then the counter will rollover to Level 15. This is
illustrated in Figure 8.
Figure 10. One step Brightness Decrease
This method is quite simple and the only requirement is
Figure 8. Down Counter Rollover
Similarly, when the counter mode is set to count up and
a programming pulse forces the brightness level to step
up from level 15, then the counter will rollover to level 0
as illustrated in Figure 9.
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.
September 2010
11
M9999-092810
(408) 944-0800
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