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ST switch IC tailored for AC/DC converters

Posted: 07 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st? switch ic? AC/DC converter? viper53e?

STMicroelectronics (ST) has rolled out a primary-side switch IC for AC/DC converters, designed for DVD players, LCD monitors, STBs, games consoles, and stand-by power supplies for servers.

The new VIPer53E can be used to build off-line power supplies with a secondary power capability of up to 30W with a wide input-voltage range, or 50W with a single European voltage range. The company boasted that it can sustain these ratings in a DIP-8 package without a heatsink. In addition, the device's stand-by consumption of 0.5W enables power supply makers to meet stringent ecological standards, such as those of the Blue Angel Eco and Energy Star programs, ST added.

The VIPer53E combines an enhanced current-mode PWM controller with a high-voltage MDmesh power MOSFET, a start-up high-voltage current source and several on-chip protection circuits. According to the press release, it is an alternative to the VIPer53 for use when a power supply design only needs secondary regulation. The VIPer53E can be used across a VDD range of 9V to 18V when used for secondary regulation, giving power supply designers added flexibility in their choice of transformers.

The press release cited other features: overload and short-circuit conditions are controlled by feedback monitoring and a delayed device reset; its stand-by mode is made more efficient by enhancing the way the part skips pulses; and the integrated startup current source is disabled during normal operation to reduce the input power required.

The VIPer53E offers protections against voltages of more than 18V and under-voltages, excessive temperatures and excessive drain currents. The switching frequency can be externally set at up to 300kHz.

Priced at 90 cents in quantities of 10,000 pieces, the primary-side switch IC is available in surface-mounting DIP-8 and PowerSO-10 packages.



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