Project Analog - April 2008 - (Page 12)

flexible building blocks for singleor multi-channel Class D amplifier products in the 50- to 500-W output range. This approach safeguards designers’ freedom to optimize the switching frequency, which also influences the output filter design, and the feedback network. Feedback design is a crucial differentiating feature for Class D amplifier designs. In some cases, an open-loop configuration may deliver satisfactory performance, but designers can achieve audiophile levels of harmonic distortion and noise (THD + N) performance by judicious use of feedback to improve power supply rejection. Figure 3 shows a simplified block diagram of the IRS2092 gatedriver IC. The comparator input of the integrated PWM-block can be accessed via an external pin, providing more control over feedback design than is provided by the majority of MOSFET gate drivers. fig 3 Block diagraM of thE irs2092 gatE-drivEr ic. as eliminating the EMI challenges associated with external PWM circuitry. Necessary protection features and deadtime control are also integrated, as well as measures to prevent click-noise and switching noise from distorting the output signal. Contents Viewpoint Calculating Power Dissipation Accelerating Amplifier Design Driving Power MOSFETs Analog news • reFerences Reference design http://ec.irf.com/ v6/en/US/adirect/ir?cmd=catProductD etailFrame&productID=IRAUDAMP5 Application note “PCB Layout with IR Class D Audio Gate Drivers” http:// www.irf.com/technical-info/appnotes/ an-1135.pdf Datasheet http://www.irf.com/ product-info/datasheets/data/ irs2092.pdf fig 2 tyPical toPology of an oPEn-looP class d audio aMPlifiEr. Microchip analog page MOSFET driver overview Sample center microchipDIRECT Reference designs/ app notes Technical training Also, by providing on-chip PWM, the driver IC saves external components and streamlines design, as well 12 · prOjECT ANAlOg · Apr 08 http://ec.irf.com/v6/en/US/adirect/ir?cmd=catProductDetailFrame&productID=IRAUDAMP5 http://ec.irf.com/v6/en/US/adirect/ir?cmd=catProductDetailFrame&productID=IRAUDAMP5 http://ec.irf.com/v6/en/US/adirect/ir?cmd=catProductDetailFrame&productID=IRAUDAMP5 http://www.irf.com/technical-info/appnotes/an-1135.pdf http://www.irf.com/technical-info/appnotes/an-1135.pdf http://www.irf.com/technical-info/appnotes/an-1135.pdf http://www.microchip.com http://www.irf.com/product-info/datasheets/data/irs2092.pdf http://www.irf.com/product-info/datasheets/data/irs2092.pdf http://www.irf.com/product-info/datasheets/data/irs2092.pdf http://www.microchip.com/analog http://www.microchip.com/analog http://www.microchip.com/mosfetdriver http://www.microchip.com/mosfetdriver http://sample.microchip.com/Default.aspx?testCookies=true http://www.microchipdirect.com/catalogselection.aspx?returnURL=default.aspx http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1423

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Project Analog - April 2008 Contents Viewpoint About Project Analog Sponsor Calculating Power Dissipation in a MOSFET Driver Accelerating Design of >50-W Class D Amplifiers Driving Power MOSFETs in Switch Mode Power Supplies Synergistic MOSFET Solutions Trends in MOSFET Gate Drivers Analog News—Analog news from multiple sources Enter to win an iPhone Contact Project Analog Sponsor Treelink Microchip Advanced Parts Selector (MAPS)

Project Analog - April 2008

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