2.5W Stereo Audio Amplifier using LM4752

The Stereo Audio Amplifier project shown here is capable of delivering 2.5W per channel of continuous average output power to 4Ω loads using a single 12V supply at 10% THD+N. The project is built using the LM4752 chip. This chip is specifically designed for single supply operations and low external components count. The gain and bias resistors are integrated on-chip, resulting in a 2.5W stereo amplifier in a compact 7-pin TO263 SMD package. High output power levels at 12V supplies and low external component count offer high value for compact stereo and TV applications. Sufficient power dissipation is provided on PCB so no external heatsink is required for IC.

Features

• Supply 12V-16V DC
• PO 2.5W Stereo at 10% THD+N @ 1 kHz into 4Ω
• Drives 4Ω and 8Ω Loads
• Internal Gain Resistors (AV = 34 dB)
• Minimum External Component
• Single Supply Operation
• Internal Current Limiting
• Internal Thermal Protection
• On-Board Power LED
• On-Board Trimmer Potentiometer for Volume Control
• Screw Terminal for Power Supply
• Screw Terminal for Speaker Connections
• 3 Pin Male Header for Audio Signal Input
• On-Board Thermal Area for Power Dissipation
• 4 x 3 mm Mounting Holes
• PCB Dimensions 75.72 x 89.99mm

Connections

• CN1: Pin 1 VCC, Pin 2 GND
• CN2: Audio Signal Input Channel B
• CN3: Audio Signal Input Channel A
• CN4: Speaker Channel B
• CN5: Speaker Channel A
• PR1: Trimmer Potentiometer for Channel B Audio Volume Control
• PR2: Trimmer Potentiometer for Channel A Audio Volume Control
• D1 Power LED

Schematic

Parts List

Connections

Gerber View

Photos

Video

LM4752 Datasheet

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