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EV0045 (MP7731)

Compact 25W Class D

Stereo Bridged Audio Amplifier

Monolithic Power Systems

EVALUATION BOARD 鈥?PRELIMINARY INFORMATION

GENERAL DESCRIPTION

The EV0045 is a stereo evaluation board

featuring MPS鈥?MP7731 Class D Full Bridge

Audio Amplifier. The EV0045 can deliver 25W

into a 4鈩?load with a 14.5V input supply.

The MP7731 is a mono 30W Class D Audio

Amplifier. It is one of MPS鈥?second generation

of fully integrated audio amplifiers which

dramatically reduces solution size by integrating

the following:

鈥?/div>

180m鈩?power MOSFETs

Start up / shut down pop elimination

Short circuit protection circuits

Mute / Standby Mode

FEATURES

鈥?/div>

25W into 4鈩?with 14.5V Input

90% Efficiency at 5W

9.5V to 14.5V Supply Voltage Operation

Full Bridge Output Drive

Integrated 180m鈩?Switches

Turn On / Turn Off Click and Pop

Suppression

Integrated Short Circuit Protection

Integrated Thermal shutdown

Mute / Standby Mode

Notebook and Multimedia Computers

Television and Home Theatre Systems

DVD and VCR Players

APPLICATIONS

The MP7731 utilizes a full bridge output

structure capable of delivering 30W into 4鈩?/div>

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%.

, 鈥淢PS鈥? 鈥淢onolithic Power Systems鈥? and 鈥淭he Future of Analog IC

Technology鈥?are Registered Trademarks of Monolithic Power Systems, Inc.

EVALUATION BOARD

ABSOLUTE MAXIMUM RATINGS

Supply Voltage V

IN

....................................... 26V

BS Voltage.......................V

SW

-0.3V to V

SW

+6.5V

Enable Voltage V

EN

........................... -0.3V to 6V

V

SW

, V

NIN

.............................. -1V to V

DD

+1V

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

Recommended Operating Conditions

Input Voltage V

DD

.......................... 9.5V to 14.5V

Signal Input Voltage ..............................鹵1V rms

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

Signal Source Impedance ..........less than 600鈩?/div>

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

Speaker Resistance ............................ 4鈩?to 8鈩?/div>

Dimensions (1.9鈥漍 x 1.2鈥漎)

Board Number

EV0045

MPS IC Number

MP7731DF

06/04, Rev. 1.3

www.MonolithicPower.com

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