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LM3445 from NS,National Semiconductor

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LM3445

Manufacturer: NS

Triac Dimmable Offline LED Driver

Partnumber Manufacturer Quantity Availability
LM3445 NS 100 In Stock

Description and Introduction

Triac Dimmable Offline LED Driver The LM3445 is a TRIAC dimmable offline LED driver controller manufactured by National Semiconductor (NS). Below are its key specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage Range:** 80V to 270V AC  
- **Output Voltage Range:** Adjustable (depends on external components)  
- **Dimming Control:** TRIAC dimmer compatible  
- **Switching Frequency:** Adjustable (typically up to 1MHz)  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** SOIC-8  

### **Descriptions:**  
The LM3445 is designed for driving high-brightness LEDs from AC mains power. It integrates a constant off-time controller with a TRIAC dimming interface, enabling smooth dimming performance with standard phase-cut dimmers. It supports both leading-edge and trailing-edge dimmers.

### **Features:**  
- **TRIAC Dimmer Compatibility:** Works with leading-edge and trailing-edge dimmers.  
- **Constant Current Regulation:** Maintains consistent LED brightness.  
- **Thermal Foldback:** Protects LEDs from overheating.  
- **Adjustable Dimming Range:** Supports a wide dimming range.  
- **High Efficiency:** Uses a buck converter topology for efficient power conversion.  
- **Flicker-Free Operation:** Minimizes flicker during dimming.  

For detailed application circuits and additional parameters, refer to the official LM3445 datasheet.

Application Scenarios & Design Considerations

Triac Dimmable Offline LED Driver

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