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| 型号： | MIC2844AYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 10TMLF |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 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： | 10-UFDFN 裸露焊盘，10-TMLF? |
| 供应商设备封装： | 10-TMLF?（2x2） |
| 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： | 576-3473-6 |
Micrel Inc.
MIC2844A
Brightness Level
Average
(0 - 48)
I LED (mA)
Application Information
Average
Duty
Cycle (%)
0 100 12
1 80 9.6
2 60 7.2
I PEAK (mA)
Dynamic Average Matching? (DAM?)
The Dynamic Average Matching? architecture
multiplexes four voltage references to provide highly
accurate LED current and channel matching. The
MIC2844A achieves industry leading LED channel
matching of 1.5% across the entire dimming range.
3
4
5
48.33
36.67
29.17
5.8
4.4
3.5
High Current Parallel Operation
U1 MIC2844AYMT
6
7
8
9
10
11
12
21.67
16.67
11.67
9.17
6.67
5
3.33
2.6
2
1.4
1.1
0.8
0.6
0.4
60% of I PEAK
R SET = 20.5k ?
I PEAK = 12mA
C1
VIN
RSET
DC
Digital
Control
Low
Dropout
Linear
Driver
V IN
13
14
15
2.5
1.67
0.83
0.3
0.2
0.1
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
0
0.83
0.83
1.25
1.67
2.08
2.5
2.92
3.33
4.17
5
5.83
6.67
7.92
9.17
10.42
11.67
14.17
16.67
19.17
21.67
25.42
29.17
32.92
36.67
42.5
48.33
54.17
60
70
80
90
100
0
0.1
0.17
0.25
0.33
0.42
0.5
0.58
0.67
0.83
1
1.17
1.33
1.58
1.83
2.08
2.33
2.83
3.33
3.83
4.33
5.08
5.83
6.58
7.33
8.5
9.67
10.83
12
14
16
18
20
0
60% of I PEAK
100% of I PEAK
R SET = 20.5k ?
I PEAK = 20mA
Figure 3. High Current LED Driver Circuit
The linear drivers are independent of each other and can
be used individually or paralleled in any combination for
higher current applications. A single WLED can be
driven with all 6 linear drivers by connecting D1 through
D6 in parallel to the cathode of the WLED as shown in
Figure 3. This will generate a current 6 times the
individual channel current and can be used for higher
current WLEDs such as those used in flash or torch
applications.
Digital Dimming
The MIC2844A utilizes an internal dynamic pulse width
to generate an average duty cycle for each brightness
level. By varying the duty cycle the average current
achieves 49 logarithmically spaced brightness levels.
This generates a brightness scale similar to the
perception of brightness seen by the “human eye.”
Figure 4 shows the LED current for a single channel at
different brightness levels. When dimming, the D1
through D6 pins are 60° out of phase from each other to
reduce electromagnetic interference. The MIC2844A
uses an internal frequency of approximately 700Hz to
dim the WLEDs. With the period of approximately
1.43ms, the 60° phase shift equates to a timing offset of
238 μ s. As shown in Figure 5, brightness level 32 was
selected to show the phase shift across the channels.
Table 1. Digital Interface Brightness Level Table
August 2009
8
M9999-080309-D
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| MIC2845A-MFYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with PWM 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 |
| MIC2845A-MFYMT-TR | 功能描述:LED 驱动器 IC 6 输出 线性 PWM 调光 20mA 14-TMLF?（2.5x2.5） 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 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:PWM 应用:背光，照相机闪光灯 工作温度:-40°C ~ 150°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 |
| MIC2845A-MGYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with PWM 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 |
| MIC2845A-MGYMT-TR | 功能描述:LED 驱动器 IC 6 输出 线性 PWM 调光 20mA 14-TMLF?（2.5x2.5） 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 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:PWM 应用:背光，照相机闪光灯 工作温度:-40°C ~ 150°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 |
| MIC2845A-PGYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with PWM 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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