LM3431 - 具有集成升压控制器的 3 通道恒流 LED 驱动器

LM3431是TI德州仪器公司的一款LED照明-照明产品，LM3431是具有集成升压控制器的 3 通道恒流 LED 驱动器，本站介绍了LM3431的封装应用图解、特点和优点、功能等，并给出了与LM3431相关的TI元器件型号供参考。

LM3431 - 具有集成升压控制器的 3 通道恒流 LED 驱动器 - LED照明-照明 - LED驱动器 - 德州仪器

产品描述

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.

产品特性

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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