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Sublimity Audio Stereo Class-D Audio Amplifier. Authors Joe Baird Luke Raynor Aaron Taylor. Advisor Dr. Osterberg Industry Representative Mr Mike Desmith Intel. Introduction. Why Class-D? Higher Efficiency amplifier Important to mobile electronics - PowerPoint PPT Presentation
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CS-EE 481 Spring 2007
Founder’s Day, 2007 1University of Portland School of Engineering
Sublimity AudioStereo Class-D Audio Amplifier
AuthorsJoe Baird
Luke Raynor
Aaron Taylor
AdvisorDr. Osterberg
Industry RepresentativeMr Mike Desmith
Intel
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Introduction
• Why Class-D?
– Higher Efficiency amplifier
– Important to mobile electronics
– Efficiency less heat smaller size
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Important Things to Note
• Reasons Class-D is so efficient
• Basic idea behind the amplifier
• Importance of proper layout
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Simple Class AB Amp
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Simple Class-D Amp
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Pulse Width Modulation
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Commercial Class-D Amp Specifications VS Sublimity Audio Class-D Amp
Specification Alpine MRP-M450Value
Sublimity AudioValue
Power Requirements 14.4V DC (11V to 16V) 12V DC (10V to 14V)
Efficiency 80 % 80 %
RMS Power Per channel into 4 ohms: 220W x 1 (1% THD) At 12V: 100W TotalPer Right/Left Channel into 4 ohms: 15WSubwoofer Channel into 4 ohms: 60W
Channels 1 Channel (Mono) Operation 2 Right/Left Channels1 Subwoofer Channel
Frequency Response 20Hz - 200Hz (+3/-3dB) Right/Left Channel: 175Hz – 20kHzSubwoofer Channel: 20Hz – 200Hz
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Getting Started
• Researched amp design
• Broke the project down into individual groups
• Each member focused on specific part
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Building and Testing
• Built each unit independently
• Each unit was tested/debugged until successful
• Individual units were integrated together to build full amp design
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Block Diagram
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Schematic Diagram
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A Single Channel
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Preamplifier/Filter
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Output Filters
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Frequency Response
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Results
Planned Measured
Frequency Response
Satellites: 200Hz-30kHz
Sub: 0Hz-200Hz`
Satellites: 196Hz-42.3kHz
Sub: ~20Hz-188Hz
Voltage Gain Satellites: 12V/V
Sub: 24V/V
Satellites: 15V/V
Sub: 35V/V
Power Gain Satellites: 12W
Sub: 60W
Satellites: 14.1W
Sub: 76.6W
Efficiency >80% 92%
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Wrap It Up
• Class-D amps are way more efficient
• EMI on a breadboard is a nightmare
• Future release would be surface mounted
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Crank the Tunes!
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Thanks for listeningAny questions?
Great appreciation is given to the following sponsors:
Mundorf provided the output filter components. Visit them at www.mundorf.com
International Rectifier provided the gate driver and MOSFET components. Visit them at www.irf.com
Texas Instruments provided the PWM controller. Visit them at www.ti.com
Linear Technology provided the simulation software necessary to test the design: LTSpice/SwCad III
Download your free copy at www.linear.com