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LM3445MMX from NS,National Semiconductor

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LM3445MMX

Manufacturer: NS

Triac Dimmable Offline LED Driver

Partnumber Manufacturer Quantity Availability
LM3445MMX NS 808 In Stock

Description and Introduction

Triac Dimmable Offline LED Driver The LM3445MMX is a TRIAC dimmable offline LED driver controller manufactured by Texas Instruments (formerly National Semiconductor, NS).  

### **Specifications:**  
- **Input Voltage Range:** 80V to 270V AC  
- **Output Current:** Adjustable via external components  
- **Dimming Control:** Compatible with leading-edge (TRIAC) dimmers  
- **Switching Frequency:** Adjustable (typically up to 1MHz)  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** 10-pin VSSOP (MMX)  

### **Descriptions:**  
The LM3445MMX is designed for offline LED driver applications, providing constant current regulation for LED strings. It supports phase-cut dimming from standard TRIAC dimmers and includes features to ensure stable dimming performance without flicker.  

### **Features:**  
- **TRIAC Dimmable:** Works with leading-edge phase-cut dimmers.  
- **Active Valley Detection:** Reduces audible noise and improves efficiency.  
- **Thermal Foldback:** Protects LEDs from overheating.  
- **Adjustable Dimming Response:** Configurable for smooth dimming curves.  
- **Bleeder Circuit Control:** Ensures compatibility with various dimmers.  
- **High Efficiency:** Uses a buck converter topology for power conversion.  

For detailed electrical characteristics and application circuits, refer to the official Texas Instruments datasheet.

Application Scenarios & Design Considerations

Triac Dimmable Offline LED Driver

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