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參數(shù)資料
| 型號(hào)： | CAT4240TD-GT3 |
| 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 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 319K |
| 代理商： | CAT4240TD-GT3 |
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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| 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 |
| CAT-42506 | 制造商:Thomas & Betts 功能描述:1/4' YELLOW 6 PCS. PER BAG |
| CAT4254VP2-GT3 | 制造商:Catalyst Semiconductor 功能描述: 制造商:ON Semiconductor 功能描述: |
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| CAT431LEUK-TE7 | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 1.24V .5% RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
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