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MOSFET package increases power circuitry efficiency

Posted: 09 May 2013 ?? ?Print Version ?Bookmark and Share

Keywords:MOSFET? power supply? switching control?

STMicroelectronics has rolled out what it says as the first MDmesh V Super-Junction MOSFET featuring a package technology that increases the efficiency of power circuitry in equipment such as white goods, TVs, PCs, telecom and server switched-mode power supplies. According to the company, the TO247-4 4-lead package offers a direct source connection used only for switching control, whereas conventional packages provide one connection for both switching and power. The extra lead increases switching efficiency, which reduces energy losses and allows higher-frequency operation for more compact power supplies, added ST.

ST co-developed the package with Infineon, which is also introducing its own new Super-Junction devices, providing second-source flexibility for users.

The TO247-4 package features an innovative internal construction implementing a Kelvin connection to the source. This connection bypasses the common source inductance of the main power connection, enabling up to 60 per cent of switching losses to be eliminated and allowing designers to use higher switching frequencies that require smaller filtering components. Combining this package with ST's MDmesh Super-Junction technology, which achieves one of the highest conduction efficiencies per silicon area, delivers the best possible overall energy savings, ST indicated.

As the first MDmesh device released in the TO247-4, the STW57N65M5-4 will enable increased energy efficiency in active power-factor correction (PFC) circuits and full-bridge or half-bridge power converters for a wide variety of consumer and industrial electronic products.

The STW57N65M5-4 in TO247-4 claims to feature high noise immunity, lowering susceptibility to electro-magnetic interference (EMI). It also flaunts increased voltage rating for greater safety margins, high dv/dt capability for enhanced reliability and 100 per cent avalanche tested, enabling use in rugged designs.

The STW57N65M5-4 is in mass production now, priced from $10 for orders over 1,000 pieces.

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