收藏本站
CAT3648
LED Current Selection
After power ? up, the LED current is set by the external
resistor (R SET ) value and the number of pulses (n) on the
EN/DIM input as follows:
Table 7. DIMMING LEVELS
Full Scale Current in %
100
Dimming Pulses [n]
0
LED current + 125
0.6 V
R SET
31 * n
31
97
94
1
2
The full scale current is calculated from the above formula
with n equal to zero.
The EN/DIM pin has two primary functions. One function
enables and disables the device. The other function is LED
current dimming with 32 different levels by pulsing the input
signal, as shown on Figure 25. On each consecutive pulse
rising edge, the LED current is decreased by about 3.2%
(1/31 th of the full scale value). After 30 pulses, the LED
current is 3.2% of the full scale current. On the 31 st pulse, the
current drops to zero, and then goes back to full scale on the
following pulse.
Each pulse width should be between 200 ns and 100 m s.
Pulses faster than the minimum T LO may be ignored and
filtered by the device. Pulses longer than the maximum T LO
may shutdown the device. By pulsing the EN/DIM signal at
high frequency, the LED current can quickly be set to zero.
The LED driver enters a “zero current” shutdown mode if
EN/DIM is held low for 1.5 ms or more.
The dimming level is set by the number of pulses on the
EN/DIM after the power ? up, as shown in Table 7.
T HI
EN/DIM
90
87
84
81
77
74
71
68
65
61
58
55
52
48
45
42
39
35
32
29
26
23
19
16
13
10
6
3
0
100
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
T LED
T LO
T PWRDWN
100%
97% 94%
100%
LED
Current
Shutdown
32 Levels
3%
0%
Shutdown
Figure 25. EN/DIM Digital Dimming Timing Diagram
http://onsemi.com
11
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
CAT3661HV3-GT2 IC LED DRVR WHT BCKLGHT 16TQFN
CAT37TDI-T2 IC LED DRVR WHITE BCKLGHT TSOT-5
CAT4002ASD-GT3 LED DR 2 CH EZ DIM I/F SC-88
CAT4003BTD-GT3 IC LED DVR 3CH TSOT23-6
CAT4004AHU2-GT3B IC LED DVR 4CH EZ DIM I/F 8DFN
CAT4004VP2-T3 IC LED DRIVER LINEAR 8-TDFN
CAT4008W-T2 IC LED DRIVER LINEAR 16-SOIC
CAT4101TV-T75 IC LED DRVR HP CONST CURR D2PAK
相关代理商/技术参数
CAT3649 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:6-Channel Quad-Mode LED Driver with 32 Dimming Levels & PWM
CAT3649AGEVB 功能描述:电源管理IC开发工具 EVB FOR CAT3649 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
CAT3649HV3-GT2 功能描述:LED照明驱动器 6 channel quad mode LED Driver 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
CAT3661HV3-GT2 功能描述:LED照明驱动器 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
CAT37 制造商:TI 制造商全称:Texas Instruments 功能描述:CMOS White LED Driver Boost Converter
CAT37_05 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:CMOS White LED Driver Boost Converter
CAT37_08 制造商:TI 制造商全称:Texas Instruments 功能描述:CMOS White LED Driver Boost Converter
CAT37EKK-TE7 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:CMOS White LED Driver Boost Converter