參數(shù)資料
型號(hào)： CAT4201
元件分類： LED驅(qū)動(dòng)器
英文描述： 350mA High Efficiency Step Down LED Driver
中文描述： 350mA的高效率LED驅(qū)動(dòng)下步
文件頁數(shù)： 10/15頁
文件大?。?/td> 330K
代理商： CAT4201
CAT4201
Doc. No. MD-5025 Rev. B
10
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Dimming Methods
Two methods for PWM dimming control on the LEDs
are described below. The first method is to PWM on
the control pin, the other method is to turn on and off a
second resistor connected to the RSET pin and
connected in parallel with R1.
PWM on CTRL pin
A PWM signal from a microprocessor can be used for
dimming the LEDs when tied to the CTRL pin. The
duty cycle which is the ratio between the On time and
the total cycle time sets the dimming factor. The
recommended PWM frequency on the CTRL pin is
between 100Hz and 2kHz.
Figure 3. PWM at 1kHz on CTRL Pin
Figure 4. LED Current vs. Duty Cycle
Figure 5. Circuit for PWM on CTRL
PWM on RSET pin
Another dimming method is to place in parallel to R1
another resistor with a FET in series, as shown on
Figure 6. R1 sets the minimum LED current corres-
ponding to 0% duty cycle. The combined resistor of
R1 and Rmax sets the maximum LED current
corresponding to 100% duty cycle.
Figure 6. Circuit for PWM on RSET
0
50
100
150
200
250
300
0
20
40
60
80
100
DUTY CYCLE [%]
L
RSET
SW
GND
CAT4201
VBAT
VBAT
PWM
control
4.7μF
C1
10μF
C2
NPN
L
D
12V
0V
5V
CTRL
22μH
1k
R5
47k
R1
10k
R2
Q1
1k
R4
RSET
SW
GND
CAT4201
VBAT
VBAT
PWM
control
Rmax
4.7μF
C1
10μF
C2
NPN
R1
L
D
13V
CTRL
22μH
1k
R2
Q1
OFF ON
相關(guān)PDF資料
PDF描述
CAT4201TD-GT3 350mA High Efficiency Step Down LED Driver
CAT4237 High Voltage CMOS Boost White LED Driver
CAT4237TD High Voltage CMOS Boost White LED Driver
CAT4237TS High Voltage CMOS Boost White LED Driver
CAT4240 6 Watt Boost LED Driver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CAT4201AEVB 功能描述:BOARD EVALUATION DPP CAT4201A RoHS:是 類別:編程器，開發(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
CAT4201AGEVB 功能描述:LED 照明開發(fā)工具 EVAL BOARD FOR LED DRIVER RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝:
CAT4201TD 制造商:ON Semiconductor 功能描述:IC LED DRIVER HI EFFICIENCY
CAT4201TD-GT3 功能描述:LED照明驅(qū)動(dòng)器 350mA Hi-Efficiency Step-Down 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
CAT4201TD-GT3 制造商:ON Semiconductor 功能描述:IC LED DRIVER BUCK TSOT-23-5 制造商:ON Semiconductor 功能描述:IC, LED DRIVER, BUCK, TSOT-23-5
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*