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參數資料
| 型號： | CAT4137 |
| 元件分類： | LED驅動器 |
| 英文描述： | CMOS Boost Converter- White LED Driver |
| 中文描述： | 的CMOS升壓轉換器，白光LED驅動器 |
| 文件頁數： | 10/14頁 |
| 文件大?。?/td> | 504K |
| 代理商： | CAT4137 |
CAT4137
2005 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
10 of 14
Doc. 5012 , Rev. A
Dimming Control
There are several methods available to
control the LED brightness.
1. 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 2
and 3 show 1kHz and 4kHz signals with a
50% duty cycle applied to the SHDN* pin.
The PWM frequency range is from 100Hz to
10kHz. The recommended PWM frequency
range is from 100Hz to 4kHz.
Switching waveforms PWM on SHDN*
Figure 2. PWM at 1kHz
Figure 3. PWM at 4kHz
2. 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 4 shows the
PWM control circuitry connected to the
CAT4137 FB pin. The PWM signal has a
voltage swing of 0V to 2.5V. The LED current
can be dimmed within a range from 0 to
22mA. The PWM signal frequency can vary
from very low frequency up to 100kHz.
Figure 4. Circuit for filtered PWM signal
A PWM signal at 0V DC, or a 0% duty cycle,
results in a max LED current of about 22mA.
A PWM signal with a 100% duty cycle results
in an LED current of 0mA.
LED Current vs. Duty Cycle
0
5
10
15
20
25
0
20
40
60
80
100
DUTY CYCLE [%]
L
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相關代理商/技術參數 |
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| CAT4137AEVB | 功能描述:BOARD EVALUATION DPP CAT4137A RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - LED 驅動器 系列:* 標準包裝:1 系列:PowerWise® 電流 - 輸出 / 通道:20mA 輸出及類型:1，非隔離 輸出電壓:17V 特點:可調光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關產品: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 |
| CAT4137TD | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:CMOS Boost Converter - White LED Driver |
| CAT4137TD-GT3 | 功能描述:LED照明驅動器 LED Driver,Boost 5 LED,series RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT4137TD-T3 | 功能描述:LED照明驅動器 Boost Converter White LED RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT4137TS | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:CMOS Boost Converter - White LED Driver |
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