170W Class D Audio Amplifier Solution The LM4651N is a fully integrated class D amplifier driver IC manufactured by National Semiconductor (NS). Below are its specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** National Semiconductor (NS)
- **Type:** Class D Audio Power Amplifier Driver
- **Operating Voltage Range:** 10V to 18V
- **Output Power:** Up to 170W (with external MOSFETs)
- **Efficiency:** Typically >85%
- **Switching Frequency:** Adjustable (typically 125kHz)
- **Package:** 28-Pin PDIP (Plastic Dual In-Line Package)
- **Operating Temperature Range:** -40°C to +85°C
### **Descriptions:**
The LM4651N is designed for high-efficiency class D audio amplifier applications. It includes a PWM modulator, gate drivers, and protection circuitry, requiring only external MOSFETs and passive components to form a complete class D amplifier system. It is suitable for high-power audio applications such as home theater systems and professional audio amplifiers.
### **Features:**
- **Integrated PWM Modulator:** Converts analog audio signals into a pulse-width modulated (PWM) output.
- **Gate Drivers:** Includes high-current MOSFET gate drivers for efficient switching.
- **Adjustable Dead Time Control:** Minimizes distortion and improves efficiency.
- **Overcurrent Protection:** Prevents damage during fault conditions.
- **Thermal Shutdown:** Protects the IC from overheating.
- **Undervoltage Lockout (UVLO):** Ensures proper operation within the specified voltage range.
- **Standby Mode:** Reduces power consumption when not in use.
This information is based on the manufacturer's datasheet and technical documentation.
