Edit Proposal: Milestone-Proposal:First Integrated PWM Controller for Switching Power Supplies You do not have permission to edit this page, for the following reason: You are not currently logged in. The action you have requested is limited to users in the group: Users. Please log in or create an account. Docket ID: (admins only) Thank you for proposing a technical achievement for possible recognition as an IEEE Milestone in Electrical Engineering and Computing. Your efforts help preserve the heritage of technology. Detailed information on the Milestone application process may be found at: Milestone Guidelines and How to Propose a Milestone. At least one of the proposer(s) must be an IEEE Member (including Student Member) in good standing. To the proposer’s knowledge, is this achievement subject to litigation? If the answer is "yes", the proposal cannot proceed further. None Yes No You must be able to answer "yes" to all of the following questions. 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Some examples of the text of good milestone articles are First Radio Astronomical Observations Using Very Long Baseline Interferometry] and G3_Facsimile International Standardization of G3 Facsimile (Do not worry about the formatting of the page, IEEE History Center Staff will do that afterwards.) What is the historical significance of the work (its technological, scientific, or social importance)? This invention is of significant technological importance as it revolutionized the technology of power supply design, ushering the industry into a conversion from large, heavy, and very inefficient linearly controled designs, to high-frequency switching solutions, a technology known before the advent of the SG1524, but ignored by all but the most sophisticated designers due to the perceived high cost, extreme complexity, and poor reliability – all of which disappeared with the introduction of the SG1524. </p> </p> </p> <p>With this product, switching power supplies became ubiquitous and pervasive throughout all forms of electronic systems, doing for electronic power supplies what Jack Kilby’s invention of the integrated circuit did for computing systems. What obstacles (technical, political, geographic) needed to be overcome? Switching power supplies, also known as switchers or switched-mode power supplies [SMPSs], were being built using discrete components at least as far back as the 1950s. And by the early 1970s, some of the individual analog and digital functions needed to perform PWM—the control technique commonly used to regulate the output of the switching power supply—were becoming available as separate individual ICs. But as stated above, the challenge of incorporating these functions onto a single chip led to the need for circuit innovation and invention for almost each functional block. New circuit designs that had to be invented included: 1. An accurate timing clock that could be free running or externally synchronized 2. An anti-saturation circuit that allowed faster switching in a non-digital process 3. An under voltage lockout circuit to allow analog control of digital thresholds 4. A latching comparator for stable PWM insensitive to switching noise 5. A new temperature compensated voltage reference device 6. And the combining of these functions into a single circuit requiring only 16 package pins. There was also the internal political obstacle of obtaining the needed company product development resources for a product for which there was no demonstratable market potential. But with this product, switching power supplies became ubiquitous and pervasive throughout all forms of electronic systems. The SG1524 led to a plethora of follow-on product designs, many of them also pioneered by Mammano and the design team that he headed. In addition, the SG1524 was also duplicated by many other semiconductor companies, becoming one of the most widely copied designs in semiconductor history. The current power management industry has reached $20 billion annually and has been growing at a pace of 20-30% a year. The use of PWM controllers are intertwined with the modern electronics industry, and have enabled a wide range of products, including applications in: • All types of power supplies for electronic equipment • Digital computing and data processing hardware • Radio, television, and other consumer entertainment products • Electronic controls for military and aerospace applications • Modern-day automotive systems and accessories • Telecommunications equipment • Medical electronics </p> </p> <p>• High efficiency controls for alternate energy sources What features set this work apart from similar achievements? The SG1524 PWM controller IC was unique in its time as the semiconductor industry was then heavily involved in the advancement of digital computing circuits and what analog efforts there were, were largely relegated to operational amplifiers and linear voltage regulators. At that point, the semiconductor industry was committed to two separate processes – a gold-doped, high-speed digital process and a slower, more difficult to control analog process that had to be carefully separated from the digital manufacturing line. Because the control of switching power supplies required both analog and digital functions, the biggest challenge of the time was the combining both functions into one chip to be built with a single process, and the introduction of the SG1524 was one of the first practical examples to prove that this was possible. </p> </p> </p> <p>Robert Mammano’s seminal IC design of the SG1524, and the many variations it inspired, tamed the complexity of SMPSs, shrinking their size and making them cost-effective and more reliable in countless applications. Supporting texts and citations to establish the dates, location, and importance of the achievement. You must supply the texts or excerpts themselves, not just the references. Minimum of five (5), but as many as needed to support the milestone, such as patents, contemporary newspaper articles, journal articles, or chapters in scholarly books. At least one of the references must be from a scholarly book or journal article. 'Scholarly' is defined as peer-reviewed, with references, and published. The full reference, in English, must be uploaded, not just the citation. See below section for details on uploading material to the website. All supporting materials must be in English, or accompanied by an English translation. Supporting materials (supported formats: GIF, JPEG, PNG, PDF, DOC) which can be made publicly available on the IEEE History Center’s website (i.e. unencumbered by copyright, or with the copyright holder’s permission). All supporting materials must be in English, or if not in English, accompanied by an English translation. You must supply the texts or excerpts themselves, not just the references. 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Note that there are multiple texts of the letter depending on whether an IEEE organizational unit other than the section will be paying for the plaque(s). Submit this proposal to the IEEE History Committee for review. Only check this when the proposal is finished Summary: This is a minor edit Watch this page Cancel Retrieved from "http://ieeemilestones.ethw.org/Milestone-Proposal:First_Integrated_PWM_Controller_for_Switching_Power_Supplies"