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LM3445MX from NS,National Semiconductor

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LM3445MX

Manufacturer: NS

Triac Dimmable Offline LED Driver

Partnumber Manufacturer Quantity Availability
LM3445MX NS 2112 In Stock

Description and Introduction

Triac Dimmable Offline LED Driver The LM3445MX is a TRIAC dimmable offline LED driver controller manufactured by National Semiconductor (NS).  

### **Specifications:**  
- **Input Voltage Range:** 85V to 265V AC  
- **Output Voltage Range:** Adjustable (depends on external components)  
- **Switching Frequency:** Adjustable (typically up to 1MHz)  
- **Dimming Control:** TRIAC dimmer compatible  
- **Package:** 8-pin SOIC  
- **Operating Temperature Range:** -40°C to +125°C  
- **Features:**  
  - Constant current LED driver  
  - Supports phase-cut dimming (leading and trailing edge)  
  - Built-in bleeder circuit for dimmer compatibility  
  - Thermal shutdown protection  
  - Adjustable dimming response  

### **Descriptions and Features:**  
- The LM3445MX is designed for driving LEDs from a high-voltage AC line with TRIAC dimmer compatibility.  
- It provides a constant current output for LED strings, ensuring uniform brightness.  
- The controller includes circuitry to maintain stability with phase-cut dimmers, preventing flicker and ensuring smooth dimming.  
- It integrates thermal protection to prevent overheating.  
- The switching frequency is adjustable, allowing optimization for efficiency and component size.  

For detailed application circuits and design guidelines, refer to the official datasheet.

Application Scenarios & Design Considerations

Triac Dimmable Offline LED Driver

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