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100V MOSFET reduces part count in SMPSs by 30%

Posted: 23 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Applied Power Electronics Conference? APEC? Infineon? MOSFET? switched mode power supply?

At the Applied Power Electronics Conference (APEC) trade show in Dallas early this week, Infineon Technologies AG introduced a new family of 100V MOSFET devices that promise to reduce part count in switched mode power supplies (SMPSs) by 30 percent, and reduce losses of up to 20 percent, compared to solutions based on standard technologies.

The new OptiMOS 2 100V family features on-state resistances as low as 4.4 milliohms in standard packages, and a figure of merit (on-state resistance times gate charge) of as low as 410 milliohm nanocoulombs to support switching speeds of 250kHz and above.

According to the press release, the new MOSFET family is designed for optimum performance in AC/DC and DC/DC power conversion applications in computer servers, and telecommunications and networking systems.

In DC/DC converter applications, the low on-state resistance helps reduce conduction losses at high loads. At light loads, the FOMg (gate charge figure of merit, or on-state resistance times gate charge) and FOMgd (gate-drain charge figure of merit, or on-state resistance times gate-drain charge) reduce the switching losses of primary-side switches in isolated DC/DC brick converters for high efficiency. FOMgd is a more accurate indicator of switching losses than FOMg, and the OptiMOS 2 100V MOSFETs features industry-low values for both figures, added Infineon.

In AC/DC converter applications, the low on-state resistance and gate charge are coupled with high immunity to dynamic turn-on, ensuring both industry-leading low conduction losses and safe operation in the synchronous rectification stage. Compared to standard technologies, said the company, the OptiMOS 2 100V MOSFETs allow a parts-count reduction of 30 percent in the secondary-side synchronous rectification stage of AC/DC SMPSs. In addition, a low thermal coefficient ensures low conduction losses even at the elevated temperatures normally present in AC/DC SMPSs.

"With the introduction of the OptiMOS 2 100V product line, Infineon takes another step in helping its customers meet the growing demand for highly efficient power supplies," said Gerald Deboy, principal of technical marketing for power management and supply at Infineon. "We increase design flexibility for engineers, enabling them to reduce component counts and system cost, improve performance and increase efficiency."

Engineering samples of the new OptiMOS 2 100V devices in TO-252 (D-Pak), TO-262 (I2-Pak) and TO-220 packages, with on-state resistances of from 5.4 milliohms to 80 milliohms, are already available. Additional package types, including D2-Pak, I-Pak and Super SO8 packages, are planned for release within the year.

In quantities of 10,000, the price per unit is less than $2.40 for the 4.4-milliohm TO-220 (IPP04CN10N) device, and less than 40 cents for the high-speed D-Pak (IPD64CN10N) device.

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