CS-EE 481 Spring 2007 1Founder’s Day, 2007 University of Portland School of Engineering Sublimity Audio Stereo Class-D Audio Amplifier Authors Joe Baird.

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Presentation transcript:

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Sublimity Audio Stereo Class-D Audio Amplifier Authors Joe Baird Luke Raynor Aaron Taylor Advisor Dr. Osterberg Industry Representative Mr Mike Desmith Intel

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Introduction Why Class-D? –Higher Efficiency amplifier –Important to mobile electronics –Efficiency  less heat  smaller size

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Important Things to Note Reasons Class-D is so efficient Basic idea behind the amplifier Importance of proper layout

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Simple Class AB Amp

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Simple Class-D Amp

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Pulse Width Modulation

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Commercial Class-D Amp Specifications VS Sublimity Audio Class-D Amp SpecificationAlpine MRP-M450 Value Sublimity Audio Value Power Requirements14.4V DC (11V to 16V)12V DC (10V to 14V) Efficiency80 % RMS PowerPer channel into 4 ohms: 220W x 1 (1% THD)At 12V: 100W Total Per Right/Left Channel into 4 ohms: 15W Subwoofer Channel into 4 ohms: 60W Channels1 Channel (Mono) Operation2 Right/Left Channels 1 Subwoofer Channel Frequency Response20Hz - 200Hz (+3/-3dB)Right/Left Channel: 175Hz – 20kHz Subwoofer Channel: 20Hz – 200Hz

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Getting Started Researched amp design Broke the project down into individual groups Each member focused on specific part

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Building and Testing Built each unit independently Each unit was tested/debugged until successful Individual units were integrated together to build full amp design

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Block Diagram

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Schematic Diagram

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering A Single Channel

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Preamplifier/Filter

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Output Filters

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Frequency Response

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Results PlannedMeasured Frequency Response Satellites: 200Hz-30kHz Sub: 0Hz-200Hz` Satellites: 196Hz-42.3kHz Sub: ~20Hz-188Hz Voltage GainSatellites: 12V/V Sub: 24V/V Satellites: 15V/V Sub: 35V/V Power GainSatellites: 12W Sub: 60W Satellites: 14.1W Sub: 76.6W Efficiency>80%92%

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Wrap It Up Class-D amps are way more efficient EMI on a breadboard is a nightmare Future release would be surface mounted

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Crank the Tunes!

CS-EE 481 Spring Founder’s Day, 2007 University of Portland School of Engineering Thanks for listening Any questions? Great appreciation is given to the following sponsors: Mundorf provided the output filter components. Visit them at International Rectifier provided the gate driver and MOSFET components. Visit them at Texas Instruments provided the PWM controller. Visit them at Linear Technology provided the simulation software necessary to test the design: LTSpice/SwCad III Download your free copy at