MP7748 9.5-36V 2x20W Stereo Single Ended Class D Audio Amplifier TSSOP28

MP7748 9.5-36V 2x20W Stereo Single Ended Class D Audio Amplifier TSSOP28

The MP7748 is a Class D Audio Amplifier for driving stereo speakers in single-ended configuration or a mono speaker in bridge-tied- load configuration.

Key Specifications

Features

• Output Power at 24V VDD and 10% THD+N
• Stereo SE configuration: 20W per channel into 4Ω load
• Mono BTL configuration: 50W into 6Ω load
• THD+N = 0.02% at 1W, 8Ω(SE)
• Low Noise (103µV with SE configuration, 140µV with BTL configuration)
• Switching Frequency Up to 1MHz
• 9.5V to 36V Operation from a Single Supply
• Integrated Startup and Shutdown Pop Elimination Circuit
• Programmable UVP
• Thermal and Short Circuit Protection

Typical Application Circuit

Applications

• Portable Docking Stations
• Surround Sound DVD Systems
• Televisions
• Flat Panel Monitors
• Multimedia Computers

Design Notes

• The output LC filter corner should sit well below the modulation frequency but above the audio band; component tolerance shifts it more than the nominal value suggests.
• Switching residuals on the speaker leads are best handled at layout — keep the filter close to the amplifier pins.
• Power supply rejection is frequency dependent, so a clean rail still matters at the modulation harmonics.
• The exposed pad is the thermal path; solder it to a copper area sized for continuous output power, not for idle.

Common Questions