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参数资料
| 型号： | A8431EEHTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 2/11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
Features and Benefits
? Output voltage up to 32 V (OVP level)
? 2.5 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 μ A shutdown current
? OVP pin eliminates the need for an external Zener diode
on the output
Package: 6-pin MLP/DFN (suffix EH)
Approximate scale
Description
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 control 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 nominal height, 6-pin,
2 mm × 3 mm MLP package. It is lead (Pb) free, with 100%
matte tin leadframe plating.
Applications include:
? LED backlights
? Portable battery-powered equipment
? Cellular phones
? PDAs (Personal Digital Assistant)
? Camcorders, personal stereos, MP3 players, cameras
? Mobile GPS systems
Functional Block Diagram
FB
SW
VIN
V REF
1.25 V
95 mV
A1
R C
A2
R
Q
Driver
C C
Σ
Ramp
S
OVP
OVP
Generator
1.2 MHz
Oscillator
EN
Enable
GND
26185.301
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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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