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參數(shù)資料
| 型號(hào)： | A8431EEH-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | White LED Driver Constant Current Step-up Converter |
| 中文描述： | 白光LED驅(qū)動(dòng)恒流升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 331K |
| 代理商： | A8431EEH-T |
8
26185.301
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
A8431
White LED Driver Constant Current Step-up Converter
Parallel LED Strings
The A8431 can be used to power parallel strings of LEDs,
which have the same number of LEDs on each string. It is
important that the voltage drop is the same across all of the
parallel strings, to ensure that all of the LEDs are illuminated
and that the current though each string is equal.
A typical circuit with two parallel strings is shown in
schematic 5. The coversion efficiency of this configuration is
shown in chart 2.
A843
VIN
SW
EN
GND
FB
Li-ion
2.5 V to
4.2 V
C1
1.0 μF
L1
22 μH
D1
C2
0.22 μF
R2
6.3
6.3
R1
Enable
1
1
2
3
5
6
4
OVP
Conversion Efficiency for Two Parallel Strings
95
65
70
75
80
85
90
2
4
3
6
5
8
9
7
10
Input Voltage (V)
E
Two 3-LED strings
Two 4-LED strings
Two 7-LED strings
Chart 2. Conversion efficiency when driving two parallel strings
of varying lengths
Schematic 5. Parallel strings of LEDs
Preliminary Data Sheet
Subject to Change Without Notice
December 7, 2004
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| A8431EEHTR-T | 功能描述:IC LED DRVR WHITE BCKLGHT 6-MLP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| A84334-000 | 制造商:TE Connectivity 功能描述:VARISTOR 470VDC 5MM 10% LEADED 制造商:TE Connectivity 功能描述:VARISTOR 470V 400A DISC 5MM |
| A8434 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:6-Channel High Efficiency Charge Pump White LED Driver |
| A8434EESTR-T | 功能描述:IC LED DRVR WHITE BCKLGHT 16-MLP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?線性（LDO），PWM，升壓（升壓） 輸出數(shù):8 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:背光 類型 - 次要:RGB，白色 LED 頻率:500kHz ~ 1.5MHz 電源電壓:4.75 V ~ 26 V 輸出電壓:45V 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* 工作溫度:-40°C ~ 85°C |
| A8435 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:High Efficiency Charge Pump White LED Driver |
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