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參數(shù)資料
| 型號： | A8430 |
| 廠商： | Allegro MicroSystems, Inc. |
| 元件分類： | LED驅動器 |
| 英文描述： | White LED Driver Constant Current Step-up Converter |
| 中文描述： | 白光LED驅動恒流升壓轉換器 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 329K |
| 代理商： | A8430 |
8
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
Overvoltage protection for the A8430 requires a Zener diode
to clamp the output voltage, as shown in schematic 5. The
Zener voltage should be greater than the maximum output
voltage of the LED string. The Zener diode also should be
able to sink more than 0.1 mA of current.
Parallel LED Strings
The A8430 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 6. The coversion efficiency of this configuration is
shown in chart 2.
A8430
VIN
SW
EN
GND
FB
Li-ion
2.5V to
4.2V
C1
1μF
L1
22μH
D1
C2
0.22μF
R1
6.3
R2
1k
Enable
Schematic 5. Overvoltage protection with Zener clamp
A8430
VIN
SW
EN
GND
FB
Li-ion
2.5V to
4.2V
C1
1μF
L1
22μH
D1
C2
0.22μF
R2
6.3
6.3
R1
Enable
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 6. Parallel strings of LEDs
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| A8430EEK | White LED Driver Constant Current Step-up Converter |
| A8430EEK-T | White LED Driver Constant Current Step-up Converter |
| A8431 | White LED Driver Constant Current Step-up Converter |
| A8431EEH-T | White LED Driver Constant Current Step-up Converter |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| A8430EEK | 功能描述:IC LED DRVR WHITE BCKLGHT 5-MLPD RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅動器 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 內部驅動器: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 產品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| A8430EEK-T | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:White LED Driver Constant Current Step-up Converter |
| 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 內部驅動器: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 |
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