EV0045 (MP7731)

Compact 25W Class D

Stereo Bridged Audio Amplifier

EVALUATION BOARD – PRELIMINARY INFORMATION

06/04, Rev. 1.3

www.MonolithicPower.com

1

Monolithic Power Systems

GENERAL DESCRIPTION

The EV0045 is a stereo evaluation board

featuring MPS’ MP7731 Class D Full Bridge

Audio Amplifier. The EV0045 can deliver 25W

into a 4Ω load with a 14.5V input supply.

The MP7731 is a mono 30W Class D Audio

Amplifier. It is one of MPS’ second generation

of fully integrated audio amplifiers which

dramatically reduces solution size by integrating

the following:

• 180mΩ power MOSFETs

• Start up / shut down pop elimination

• Short circuit protection circuits

• Mute / Standby Mode

The MP7731 utilizes a full bridge output

structure capable of delivering 30W into 4Ω

speakers. As in all other MPS Class D Audio

Amplifiers, this device exhibits the high fidelity

of a Class A/B amplifier at efficiencies greater

than 90%.

FEATURES

• 25W into 4Ω with 14.5V Input

• 90% Efficiency at 5W

• 9.5V to 14.5V Supply Voltage Operation

• Full Bridge Output Drive

• Integrated 180mΩ Switches

• Turn On / Turn Off Click and Pop

Suppression

• Integrated Short Circuit Protection

• Integrated Thermal shutdown

• Mute / Standby Mode

APPLICATIONS

• Notebook and Multimedia Computers

• Television and Home Theatre Systems

• DVD and VCR Players

, “MPS”, “Monolithic Power Systems”, and “The Future of Analog IC

Technology” are Registered Trademarks of Monolithic Power Systems, Inc.

EVALUATION BOARD

Dimensions (1.9”X x 1.2”Y)

Board Number

MPS IC Number

EV0045

MP7731DF

ABSOLUTE MAXIMUM RATINGS

AGND to PGND.............................-0.3V to 0.3V

Recommended Operating Conditions

Signal Input Voltage ..............................±1V rms

Signal Input Frequency............... 20Hz to 20kHz

Signal Source Impedance ..........less than 600Ω

External Enable Input ........................... 0V to 5V

Speaker Resistance ............................ 4Ω to 8Ω