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参数资料
| 型号： | NCP1840Q8A6MNTWG |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER 12CH PROGR 20QFN |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 切换式电容器（充电泵），PWM |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，通用 |
| 频率： | 400kHz |
| 电源电压： | 3 V ~ 5.5 V |
| 输出电压： | 4.1V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
NCP1840
CURRENT LEVEL REGISTER DESCRIPTION
Data ? Binary
D7
0
0
0
0
0
0
0
0
D6
0
0
0
0
0
0
0
0
D5
0
0
0
0
0
0
0
0
D4
1
1
1
1
1
1
1
1
D3
1
1
1
1
1
1
1
1
D2
0
0
0
0
1
1
1
1
D1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
Data ? Hex
18
19
1A
1B
1C
1D
1E
1F
Percentage of Maximum Current
44.6667%
50.2333%
56.2333%
63.1000%
70.8000%
79.4333%
89.1333%
100.0000%
PWM Registers
The PWM duty cycle of each of the 8 channels on the
NCP1840 can be individually programmed by loading the
appropriate data into the PWM Register for each channel.
There are 64 different duty cycle settings per channel that are
implemented in a linear fashion from 0%, fully OFF, to
PWM REGISTER DESCRIPTION
Data ? Binary
100%, fully ON. A description of the 64 different PWM duty
cycle settings can be found in the following table. Note that
the typical on time of the LED can be calculated by
multiplying the duty cycle percentage by the typical PWM
period of 575 m s.
D7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Data ? Hex
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
PWM Duty Cycle
0.000%
1.587%
3.175%
4.762%
6.349%
7.937%
9.524%
11.111%
12.698%
14.286%
15.873%
17.460%
19.048%
20.635%
22.222%
23.810%
25.397%
26.984%
28.571%
30.159%
31.746%
33.333%
34.921%
http://onsemi.com
12
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