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On-Demand Webinar |
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| Filter Design for PWM Systems: Digital Audio vs Switching Supplies |
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Overview:
The LC filter is one of the most important circuit blocks used with a power converter or a Class-D amplifier. In a power converter application, it stores the energy to be bucked to a lower voltage or boosted to a higher voltage. When used with a Class-D amplifier, the output LC filter improves the audio quality by removing the carrier frequency and out-of-band noise, facilitates EMC compliance by attenuating the RF component of the switching waveform, and improves reliability by limiting di/dt during a short-circuit error condition.
This lab will discuss key parameters for LC filter design in both categories and a simplified approach to LC filter design for Class-D amplifiers. It will provide an example, through simulation and a lab experiment, to illustrate the effect of correct and incorrect inductor selection in the output filter of a Class-D amplifier.
Moderator:
Wm. P. (Bill) Klein, P.E., Senior Applications Engineer, High Performance Linear Division, Texas Instruments
Bill is a Senior Applications Engineer with the High Performance Linear Division at TI-Tucson. He joined TI through its acquisition of Burr-Brown in August 2000. In addition to a BSEE from Arizona State University and registration as a Professional Engineer in the State of Arizona, he has authored over 50 magazine articles, application notes and conference papers. His experience as an analog circuit designer covers a span of 30 years in fields ranging from mineral exploration to medical nuclear imaging.
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Presenters:
Fred Shipley is a Senior Applications Engineer for the Audio Power Amplifier group at Texas Instruments (TI). Fred was the driving force behind TI's digital Class-D amplifier acceptance in Korea and Asia. Prior to joining TI more than a decade ago, Fred worked in computer system development at Intel. He holds several patents in data security, analog circuitry and thermal management. Fred received a BST and completed coursework on a MSCS from the University of Houston, where he specialized in hardware/software interaction.
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Val Rhodes,Technology Director, Avnet Electronics Marketing
Val Rhodes received his BSEE from the University of Arizona and MSEE from Arizona State University, specializing in wireless communications and digital signal processing. Throughout his career, Val has designed wireless products for Intel, Comtech, Honeywell, Siemens, Orbital Sciences and General Dynamics. He has OFDM technology contributions and patents in IEEE 802.11, IEEE 802.15 and IEEE 802.16. Val also received an MBA from Arizona State University and is currently the technology director for Avnet Electronics Marketing.
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| Texas Instruments is a global semiconductor company and the world's leading designer and supplier of digital signal processing and analog technologies, the engines driving the digitalization of electronics. Texas Instruments provides innovative technologies to more than 30,000 customers in the computer, wireless communications, networking, Internet, consumer, digital motor control and mass storage markets worldwide. To help customers get to market faster, TI also offers easy-to-use development tools and extensive software and hardware support. |
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