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參數(shù)資料
| 型號(hào)： | A8431 |
| 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(yè)數(shù)： | 1/10頁(yè) |
| 文件大小： | 331K |
| 代理商： | A8431 |
26185.301
A8431
White LED Driver Constant Current Step-up Converter
Use the following complete part numbers when ordering:
AB SO LUTE MAX MUM RAT NGS
SW Pin................................................
–0.3 V to 36 V
OVP Pin ..............................................
–0.3 V to 36 V
Remaining Pins..................................
–0.3 V to 10 V
Ambient Operating Temperature, T
A
.......
–40°C to 85°C
Junction Temperature, T
J(max)
...............................
150°C
Storage Temperature, T
S
....................
–55°C to 150°C
A8431 MLPD
Output voltage up to 32 V (OVP level)
2.5 V to 10 V input
Drives up to 4 LEDs at 20 mA from a 2.5 V supply
Drives up to 5 LEDs at 20 mA from a 3 V supply
1.2 MHz switching frequency
300 mA switch current limit
1 μA shutdown current
OVP pin eliminates the need for an external Zener diode on the output
FEATURES
LED backlights
Portable battery-powered equipment
Cellular phones
PDAs (Personal Digital Assistant)
Camcorders, personal stereos, MP3 players, cameras
Mobile GPS systems
APPLICATIONS
The A8431 is a noninverting boost dc-dc converter that provides a
programmable constant current output up to 32 V for driving white
LEDs in series.The A8431 also offers an OVP (overvoltage protection)
pin. Driving the LEDs in series ensures identical currents and uniform
brightness. Up to four white LEDs can be driven at 20 mA from a single
cell Li-ion or a multicell NiMH power source. Up to two parallel strings
of eight white LEDs can be driven at 20 mA by increasing the supply
voltage up to 10 V.
The A8431 incorporates a power switch and a feedback sense amplifier
to provide a solution with minimum external components. The output
current can be set by adjusting a single external sense resistor and can
be varied with a voltage or a filtered PWM signal when dimming con-
trol is required. The high switching frequency of 1.2 MHz allows the
use of small inductor and capacitor values.
The A8431 is provided in a 0.75 mm high, 6-pin, 2 x 3 mm MLP pack-
age. It is lead (Pb) free, with 100% matte tin leadframe plating.
Part Number
A8431EEH-T
Package
6-pin, MLPD
Description
Pb-Free, Surface Mount
R
θ
JA
= 50 °C/W, see note 1, page 2
Approximate actual size
6
5
1
2
3
4
SW
GND
FB
VIN
OVP
EN
Preliminary Data Sheet
Subject to Change without Notice
December 7, 2004
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A8431EEH-T | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:White LED Driver Constant Current Step-up Converter |
| 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(pán) 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(yè)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 |
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