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参数资料
| 型号： | A8431EEHTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGHT 6-MLP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.2MHz |
| 电源电压： | 2.5 V ~ 10 V |
| 输出电压： | 32V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 供应商设备封装： | 6-MLP/DFN（2x3） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | 620-1195-6 |
A8431
White LED Driver Constant Current
Step-up Converter
Functional Description
Typical Application
A typical application circuit for the A8431 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, C1, 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, L1 and the diode D1 should be
connected as close to this pin as possible.
OVP. Overvoltage Protection sense pin to protect the A8431
from excessive voltage on the SW pin. This pin should be
connected to the output capacitor, C2. To disable this feature
connect the pin to ground.
EN. Setting lower than 0.4 V disables the A8431 and puts the
control circuit into the low-power Sleep mode. Greater than
1.5 V fully enables the A8431.
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 R1 is typically connected here.
6
VIN
L1
22 μ H
1
SW
D1
90
85
Conversion Efficiency versus Current
C1
1.0 μ F
A8431
OVP
5
C2
0.22 μ F
80
Li-ion
2.5V to
4.2V
EN
4
Enable
GND
2
FB
3
R1
6.3 Ω
75
70
V IN = 3 V
V IN = 4 V
65
60
0
5
10
15
20
LED Current (mA)
Schematic 1. Typical application
Chart 1. Conversion efficiency when driving three LEDs
in the typical application circuit.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5
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相关代理商/技术参数 |
参数描述 |
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| 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 制造商全称: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 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| A8435 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:High Efficiency Charge Pump White LED Driver |
| A8435EESTR-T | 功能描述:IC LED DRVR WHITE BCKLGHT 16-MLP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
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