Unitrode UCC3817/8 BiCMOS Power Factor Preregulators Significantly Enhance Industry-Standard Architecture.MERRIMACK, N.H.--(BUSINESS WIRE)--Sept. 20, 1999-- New addition to the world's leading PFC PFC abbr. private first class Noun 1. PFC - a powerful greenhouse gas emitted during the production of aluminum perfluorocarbon family improves system cost and performance Unitrode Corporation (NYSE NYSE See: New York Stock Exchange :UTR UTR Untranslated Region (genetics) UTR Unicode Technical Report UTR Unique Taxpayer Reference (UK Inland Revenue) UTR Unable to Reach UTR Unable to Reproduce UTR University Technical Representative ), a manufacturer of analog/linear and mixed-signal integrated circuits, modules, and nonvolatile products, today announces the UCC An abbreviation for the Uniform Commercial Code. 3817/8 family of new-generation power factor preregulators. These controllers provide easy and cost-effective compliance to IEC (International Electrotechnical Commission, Geneva, Switzerland, www.iec.ch) An organization that sets international electrical and electronics standards founded in 1906. It is made up of national committees from over 60 countries. IEC - International Electrotechnical Commission 1000-3-2 harmonic reduction requirements for any off-line power supply (from 75 W to a few kW) applications that operate over a wide or universal input voltage range (85 - 270 Vac). These controllers operate with the average current mode controlled boost power architecture pioneered by Unitrode. The industry-standard architecture of the UC3854 has been retained in these parts-- providing an easy transition path for customers. Novel features such as leading-edge modulation, simplified input voltage feed-forward, overvoltage protection, accurate power limiting, and improved noise immunity offer added flexibility and benefits to the user. "With the UCC3817/8 we are offering our customers significant improvements in system cost and performance while allowing them to leverage their familiarity with an industry-standard PFC architecture," said Rich Valley, Business Line Director of Unitrode Power Supply Control Products. "A broad range of power factor corrected supplies will benefit from features such as reduced bulk capacitor ripple current Ripple current refers to the AC portion of the current signal applied to a device in its application. Although this term defines an AC portion of the applied signal, it is usually in reference to the small level of variation of DC signals encountered in a power supply application. , improved multiplier linearity, easy synchronization, and low start-up and operating currents." Any line-connected power converter requiring PFC can benefit from the feature enhancements and improved implementation cost offered by the UCC3817. Examples include power supplies for -- Workstations and servers -- High-end monitors -- Telecom rectifiers -- Off-line battery chargers -- Set-top boxes -- Industrial controls The UCC3817 has a wide UVLO UVLO Undervoltage Lockout UVLO Under Voltage Lock Out range (16.5V/10V) with an on-chip shunt To divert, switch or bypass. regulator for bootstrap See boot. (operating system, compiler) bootstrap - To load and initialise the operating system on a computer. Normally abbreviated to "boot". From the curious expression "to pull oneself up by one's bootstraps", one of the legendary feats of Baron von Munchhausen. bias supply operation, while the UCC3818 is designed with a narrow UVLO range (10.5V/10V) more suitable for fixed bias operation. Pricing and Availability The UCC3817 and the UCC3818 are priced from $1.99 to $2.19/piece, for quantities of 1000 or more. Standard packaging options are DIL-16 (N or J), SOIC-16 (D), SOICW-16 (DW), PLCC-20 (Q), and LCC-20 (L). Temperature ranges are -40(degree)C to 85(degree)C for the UCC2817/8, and 0(degree)C to 70(degree)C for the UCC3817/8. Commercial temperature-range samples in surface-mount (UCC3817/18D) and through-hole (UCC3817/8N) packages are available from stock now. For more information, see http://www.unitrode.com/products/pfc/ucc3817.htm About Unitrode Unitrode designs and manufactures analog/linear and mixed-signal integrated circuits, modules, and nonvolatile products, principally to perform power management, portable power, and interface functions. Its products, branded under Unitrode and Benchmarq, are sold throughout the world for a variety of computer, tele- and data-communications, defense/aerospace, industrial, and consumer applications. Further information about Unitrode may be found at the Company's homepage site: http://www.unitrode.com. |
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