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| 型号： | CAT4137TD-T3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGHT TSOT-5 |
| 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： | 700kHz ~ 1.3MHz |
| 电源电压： | 2.2 V ~ 5.5 V |
| 输出电压： | 24V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 805 (CN2011-ZH PDF) |
| 其它名称： | CAT4137TD-T3DKR |
CAT4137
Dimming Control
There are several methods available to control the LED
brightness.
PWM Signal on the SHDN Pin
LED brightness dimming can be done by applying a PWM
signal to the SHDN input. The LED current is repetitively
turned on and off, so that the average current is proportional
to the duty cycle. A 100% duty cycle, with SHDN always
high, corresponds to the LEDs at nominal current.
Figures 27 and 28 show 1 kHz and 4 kHz signals with a 50%
Filtered PWM Signal
A filtered PWM signal can be used as a variable DC
voltage that can be used to control the LED current.
Figure 29 shows the PWM control circuitry connected to the
CAT4137 FB pin. The PWM signal has a voltage swing of
0 V to 2.5 V. The LED current can be dimmed within a range
from 0 to 22 mA. The PWM signal frequency can vary from
very low frequency up to 100 kHz.
R B
duty cycle applied to the SHDN pin. The PWM frequency
range is from 100 Hz to 10 kHz. The recommended PWM
frequency range is from 100 Hz to 4 kHz.
Switching Waveforms PWM on SHDN
2.5 V
0V
PWM
Signal
R A
4.02 k W
C1
0.22 μ F
VIN SW
CAT4137
SHDN
GND FB
3.3 k W
V FB = 300 mV
R2
1 k W
LED
Current
R1
15 W
Figure 29. Circuit for Filtered PWM Signal
A PWM signal at 0 V DC, or a 0% duty cycle, results in
a max LED current of about 22 mA. A PWM signal with a
100% duty cycle results in an LED current of 0 mA.
25
20
Figure 27. PWM at 1 kHz
15
10
5
0
0
20
40
60
80
100
DUTY CYCLE (%)
Figure 30. LED Current vs. Duty Cycle
Figure 28. PWM at 4 kHz
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT4137TS | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:CMOS Boost Converter - White LED Driver |
| CAT4139 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:22V High Current Boost White LED Driver |
| CAT4139AEVB | 功能描述:BOARD EVALUATION DPP CAT4139A RoHS:是 类别:编程器，开发系统 >> 评估板 - LED 驱动器 系列:* 标准包装:1 系列:PowerWise® 电流 - 输出 / 通道:20mA 输出及类型:1，非隔离 输出电压:17V 特点:可调光 输入电压:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相关产品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
| CAT4139AGEVB | 功能描述:CAT4139 1, Non-Isolated Output LED Driver Evaluation Board 制造商:on semiconductor 系列:- 零件状态:有效 电流 - 输出/通道:100mA 输出和类型:1，非隔离 电压 - 输出:22V 特性:可调光 电压 - 输入:2.8 V ~ 5.5 V 所含物品:板 使用的 IC/零件:CAT4139 标准包装:1 |
| CAT4139TD-GT3 | 功能描述:LED照明驱动器 High Current Boost White 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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