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| 型号： | LM3431SD |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, QCC28 |
| 封装： | LLP-28 |
| 文件页数： | 1/24页 |
| 文件大小： | 549K |
| 代理商： | LM3431SD |
November 20, 2007
LM3431
3-Channel Constant Current LED Driver with Integrated
Boost Controller
General Description
The LM3431 is a 3-channel linear current controller combined
with a boost switching controller ideal for driving LED back-
light panels in space critical applications. The LM3431 drives
3 external NPN transistors or MOSFETs to deliver high ac-
curacy constant current to 3 LED strings. Output current is
adjustable to drive strings in excess of 200 mA. The LM3431
can be expanded to drive as many as 6 LED strings.
The boost controller drives an external NFET switch for step-
up regulation from input voltages between 5V and 36V. The
LM3431 features LED cathode feedback to minimize regula-
tor headroom and optimize efficiency.
A DIM input pin controls LED brightness from analog or digital
control signals. Dimming frequencies up to 25 kHz are pos-
sible with a contrast ratio of 100:1. Contrast ratios greater than
1000:1 are possible at lower dimming frequencies.
The LM3431 eliminates audible noise problems by maintain-
ing constant output voltage regulation during LED dimming.
Additional features include LED short and open protection,
fault delay/error flag, cycle by cycle current limit, and thermal
shutdown for both the IC and LED array.
Features
■ 3-channel programmable LED current
■ High accuracy linear current regulation
■ Analog and digital PWM dimming control
■ Up to 25kHz dimming frequency
■ >100:1 contrast ratio
■ Integrated Boost controller
■ 5V-36V input voltage range
■ Adjustable switching frequency up to 1MHz
■ LED short and open protection
■ Selectable fault shutdown or automatic restart
■ Programmable fault delay
■ Programmable cycle by cycle current limit
■ Output Over Voltage Protection
■ No Audible Noise
■ Enable pin
■ LED Over-Temperature shutdown input
■ Thermal Shutdown
■ LLP and TSSOP-28 exposed pad package
Applications
■ Automotive Infotainment Displays
■ Small to Medium Format Displays
Typical Application Circuit
30041101
2007 National Semiconductor Corporation
300411
www.national.com
LM3431
3-Channel
Constant
Current
LED
Driver
with
Integrated
Boost
Controller
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3432 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:6-Channel Current Regulator for LED Backlight Application |
| LM3432B | 制造商:NSC 制造商全称:National Semiconductor 功能描述:6-Channel Current Regulator for LED Backlight Application |
| LM3432BSQ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:6-Channel Current Regulator for LED Backlight Application |
| LM3432BSQ/NOPB | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| LM3432BSQE | 制造商:NSC 制造商全称:National Semiconductor 功能描述:6-Channel Current Regulator for LED Backlight Application |
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