LM3431
- LM3431Q/LM3431AQ are Automotive Grade Products that are AEC-Q100 Grade 1 Qualified (–40°C to 125°C operating junction temperature)
- 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
- TSSOP-28 Exposed Pad Package
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The LM3431 is a 3-channel linear current controller combined with a boost switching controller ideal for driving LED backlight panels in space critical applications. The LM3431 drives 3 external NPN transistors or MOSFETs to deliver high accuracy 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 regulator headroom and optimize efficiency.
A DIM input pin controls LED brightness from analog or digital control signals. Dimming frequencies up to 25 kHz are possible 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 maintaining 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. The enhanced LM3431A features reduced offset voltage for higher accuracy LED current.
技术文档
| 类型 | 标题 | 下载最新的英语版本 | 日期 | |||
|---|---|---|---|---|---|---|
| * | 数据表 | LM3431/31A/31Q/31AQ 3-Chan Constant Current LED Driver w/Integrated Boost Cntr 数据表 (Rev. G) | 2013年 5月 2日 | |||
| 选择指南 | 电源管理指南 2018 (Rev. K) | 2018年 7月 31日 | ||||
| 选择指南 | 电源管理指南 2018 (Rev. R) | 2018年 6月 25日 | ||||
| 白皮书 | LED Drivers for Automotive Exterior Applications (Rev. B) | 2018年 3月 27日 | ||||
| 应用手册 | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 2013年 5月 3日 | ||||
| EVM 用户指南 | AN-1764 LM3431 Evaluation Board (Rev. A) | 2013年 5月 3日 | ||||
| 用户指南 | CCFL to LED Conversion Power Supply User Guide | 2012年 1月 27日 | ||||
| 应用手册 | Application Note 1764 LM3431 Evaluation Board (cn) | 最新英语版本 (Rev.A) | 2008年 1月 10日 | |||
| 应用手册 | Application Note 1656 Design Challenges of Switching LED Drivers (cn) | 最新英语版本 (Rev.A) | 2007年 10月 18日 |
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