參數(shù)資料
型號(hào)： CAT4240
元件分類： LED驅(qū)動(dòng)器
英文描述： 6 Watt Boost LED Driver
中文描述： 6瓦升壓LED驅(qū)動(dòng)器
文件頁(yè)數(shù)： 10/14頁(yè)
文件大?。?/td> 319K
代理商： CAT4240
CAT4240
Doc. No. MD-5026 Rev. B
10
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
DIMMING CONTROL
There are several methods available to control the
LED brightness.
PWM signal on the ˉˉˉˉˉ
LED brightness dimming can be done by applying a
PWM signal to the ˉˉˉˉˉ 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 ˉˉˉˉˉ always high, corresponds to the
LEDs at nominal current. Figure 1 shows a 1kHz
signal with a 50% duty cycle applied to the ˉˉˉˉˉ pin.
The recommended PWM frequency range is from
100Hz to 2kHz.
Pin
Figure 1. Switching Waveform
with 1kHz PWM on ˉˉˉˉˉ
Filtered PWM Signal
A filtered PWM signal used as a variable DC voltage
can control the LED current. Figure 2 shows the
PWM control circuitry connected to the CAT4240 FB
pin. The PWM signal has a voltage swing of 0V to
2.5V. The LED current can be dimmed within a range
from 0mA to 20mA. The PWM signal frequency can
vary from very low frequency up to 100kHz.
Figure 2. 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 93% duty cycle or more, results in an LED
current of 0mA.
FILTERED PWM DIMMING [0V to 2.5V]
L
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
100
PWM DUTY CYCLE [%]
VIN
SW
CAT4240
V
IN
0V
2.5V
R1
15
R2
1k
RB
3.1k
RA
3.73k
C3
0.22μF
LED
Current
V
FB
= 300mV
PWM
Signal
FB
SHDN
GND
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CAT4240_0711 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:6 Watt Boost LED Driver
CAT4240AEVB 功能描述:BOARD EVALUATION DPP CAT4240A RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - LED 驅(qū)動(dòng)器 系列:* 標(biāo)準(zhǔn)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(diǎn):可調(diào)光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關(guān)產(chǎn)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
CAT4240AGEVB 制造商:ON Semiconductor 功能描述:EVAL BD FOR LED DRIVER - Bulk 制造商:ON Semiconductor 功能描述:BOARD EVAL FOR CAT4240
CAT4240TD-GT3 功能描述:LED照明驅(qū)動(dòng)器 High Voltage Boost 2 Watt 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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
CAT4240TD-GT3 制造商:ON Semiconductor 功能描述:IC LED DRIVER BOOST TSOT-23-5 制造商:ON Semiconductor 功能描述:IC, LED DRIVER, BOOST, TSOT-23-5
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