EV0045 (MP7731)
Compact 25W Class D
Stereo Bridged Audio Amplifier
EVALUATION BOARD – PRELIMINARY INFORMATION
06/04, Rev. 1.3 www.MonolithicPo wer.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
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
PIN
, 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 ..............................±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
