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The Cyber-Spy.Com Usenet Archive Feeds Directly From The Open And Publicly Available Newsgroup Sci.Electronics.Design This Group And Thousands Of Others Are Available On Most IS NNTP News Servers On Port 119. Cyber-Spy.Com Is NOT Responsible For Any Topic, Opinions Or Content Posted To This Or Any Other Newsgroup. This Web Archive Of The Newsgroup And Posts Are For Informational Purposes Only. From: SNIPrf_man_frTHIS@yahoo.com (Frank Raffaeli) Newsgroups: sci.electronics.design Subject: Re: TI's low-cost 20W "filterless" class-D amplifer IC Date: 23 Dec 2002 09:03:19 -0800 Organization: http://groups.google.com/ Message-ID: <2c8119eb.0212230903.1e57e2cf@posting.google.com> References: <3e852f41.0212221357.7fe18af5@posting.google.com> NNTP-Posting-Host: 207.54.189.61 NNTP-Posting-Date: 23 Dec 2002 17:03:19 GMT whill@picovolt.com (Winfield Hill) wrote in message news:<3e852f41.0212221357.7fe18af5@posting.google.com>... > 20 watts... TI continues to improve the performance of their low-cost > "filterless" class-D amplifer IC offerings. > > I'm impressed by the new TPA3001, a 20-watt 0.2% distortion (15W 1kHz > 8-ohms 18V supply), no-heat-sink part in a small 24-pin TSSOP package. > Only $2.82 qty 1k, but no inventory or samples are available just yet. > > http://focus.ti.com/docs/prod/folders/print/tpa3001d1.html > http://www-s.ti.com/sc/psheets/slos398/slos398.pdf > http://www-s.ti.com/sc/psheets/slos402/slos402.pdf > > If you're not familiar with it, TI's new "filterless" class D uses a > novel modulation scheme different from most other class-D amplifiers. > "The modulation scheme has very little loss in the load without > a filter because the pulses are very short and the change in > voltage is Vcc instead of 2Vcc. As the output power increases, > the pulses widen, making the ripple current larger. Ripple > current could be filtered with an LC filter for increased > efficiency, but for most applications the filter is not needed." > They do suggest a small EMI filter. > > This un-named scheme appears to differ somewhat from TI's Equibit > "true digital" technology, however Equibit is a term that doesn't > appear much in TI's new sales literature. Hmm... Thanks for the info. That's a smart idea. I've been watching here: http://www.powerphysics.com/ 'Single cycle' controller. I've seen the patents; looks plausible in theory. I guess this helps maintain a low distortion with a wide pulse. Frank W. Raffaeli Go Back To The Cyber-Spy.Com Usenet Web Archive Index Of The sci.electronics.design Newsgroup |
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