Datasheet Details
| Part number | LM3431 |
|---|---|
| Manufacturer | National Semiconductor (now Texas Instruments) |
| File Size | 621.22 KB |
| Description | 3-Channel Constant Current LED Driver |
| Datasheet |
 LM3431 Datasheet
|
|
|
General Description
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.
Key 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/.
