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Technical Specifications
Parameters and characteristics for this part
| Specification | LM3431EVAL |
|---|---|
| Contents | Board(s) |
| Current - Output / Channel | 140 mA |
| Features | Dimmable |
| Outputs and Type | 4 |
| Outputs and Type | Non-Isolated Outputs |
| Utilized IC / Part | LM3431 |
| Voltage - Input [Max] | 18 V |
| Voltage - Input [Min] | 8 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
Description
General part information
LM3431-Q1 Series
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.
Documents
Technical documentation and resources
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