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Offline Switcher from STMicroelectronics Cuts Power-supply Component Count |
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Geneva, July 4, 2003 - STMicroelectronics (NYSE: STM) has introduced
an offline primary power switch for use in applications such as switch-mode
power supplies for DVDs, LCD monitors, set-top boxes, games consoles,
adaptors and general AC-DC converters.The VIPer53 combines an enhanced current-mode PWM controller with a high-voltage MDMesh power MOSFET in a single package. The part has an efficient standby mode, enabled by enhanced pulse skipping, that will help power-supply makers meet increasingly stringent environmental regulations such as those of the Energy Star Program. The VIPer53 also has a number of self-protection mechanisms. Overload and short-circuit faults are controlled by feedback monitoring and a delayed device reset. A high-gain error amplifier provides protection via primary regulation against secondary loop failures. Over-temperature protection is built in, removing the need for an external thermal sensor. Other features include a switching frequency of up to 300KHz, a trimmed voltage reference and current limitation. A current-mode control offers adjustable limitation, soft-start and shutdown control. There is also an auxiliary under-voltage lockout system with hysteresis. And the part can act as a high-voltage start-up current source, reducing the need for external components. The part is available in two packages, DIP-8 or PowerSO-10, which can be run without heatsinks. The DIP-8 version offers a 50W output at European voltage ranges from 195 - 265 V AC. Used with US and wider-ranging voltages of 85 - 265 V AC, the output is 30W. In the PowerSO-10 package the figures are 65W and 40W, respectively. For more information on these devices visit www.st.com/viper VIPer53 DATASHEET VIPer53 ARTICLE VIPer53 ADVERT About STMicroelectronics STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence markets. The Company's shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2002, the Company's net revenues were $6.32 billion and net earnings were $429.4 million. Further information on ST can be found at http://www.st.com. |
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