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參數(shù)資料
| 型號： | A8430EEK-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | White LED Driver Constant Current Step-up Converter |
| 中文描述： | 白光LED驅(qū)動恒流升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 329K |
| 代理商： | A8430EEK-T |
4
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
D
2
A8430
White LED Driver Constant Current Step-up Converter
Functional Description
Schematic 1. Typical application
A8430
VIN
SW
EN
GND
FB
Li-ion
2.5V to
4.2V
C1
1μF
L1
22μH
D1
C2
0.22μF
R1
6.3
Enable
Typical Application
A typical application circuit for the A8430 is provided in
schematic diagram 1. This illustrates a method of driving
three white LEDs in series. The conversion efficiency of this
configuration is shown in chart 1.
Pin Functions
The diagram also shows a method of connecting the individ-
ual pins, whos functions are described as follows:
VIN.
Supply to the control circuit. A bypass capacitor must be
connected from close to this pin to GND.
SW.
Low-side switch connection between the inductor (L1)
and ground. Because rapid changes of current occur at this pin,
the traces on the PCB that are connected to this pin should be
minimized. In addition, the inductor (L1) and diode (D1) should
be connected as close to this pin as possible.
EN.
Setting lower than 0.4 V disables the A8430 and puts the
control circuit into the low-power Sleep mode. Greater than
1.5 V fully enables the A8430.
GND.
Ground reference connected directly to the ground plane.
The sense resistor (R1) should have a separate connection
directly to this point.
FB.
Feedback pin for LED current control. The reference
voltage is 95 mV The top of the sense resistor (R1) is typically
connected to this pin.
Conversion Efficiency versus Input Voltage
70
65
75
80
85
90
95
2
3
4
5
6
7
8
9
10
V
IN
(V)
C
3 LEDs
4 LEDs
5 LEDs
Chart 1. Conversion efficiency when driving various
quantities of LEDs in the typical application circuit
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| A8431EEH-T | White LED Driver Constant Current Step-up Converter |
| A8436 | Photoflash Capacitor Charger with IGBT Driver |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| A8430EEKTR-T | 功能描述:IC LED DRVR WHITE BCKLGHT 5-MLPD RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓撲:PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器: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 供應商設備封裝: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 |
| A8430EEKTR-T | 制造商:Allegro MicroSystems 功能描述:DC-DC Converter IC |
| A8431 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:White LED Driver Constant Current Step-up Converter |
| 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)動器 系列:- 標準包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓撲:PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器: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 供應商設備封裝: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 |
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