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ST Schottky diodes provide low VF, leakage current

Posted: 10 Feb 2005 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st? schottky diode? diode? stps1150?

STMicroelectronics (ST) rolled out a series of 150V Schottky diodes engineered for use in the secondary rectification of fly-back power supplies in DVD players, STBs, TVs and Hi-Fi's. The STPS1150, STPS2150 and STPS3150 are 150V Schottky diodes that can handle continuous forward currents of up to 1-, 2- and 3A, respectively. According to ST, these devices were designed for applications where a 100V diode cannot be used and a 200V part is more expensive, yet less efficient.

Schottky diodes have three characteristics that make them more useful than conventional P-N junction rectifiers, explained the company. The first is a lower forward voltage drop (VF), which reduces rectification losses and so calls for smaller heatsinks. The second key characteristic is the negligible reverse recovery charge, which means near-zero switching losses within the Schottky; and the third is the part's ability to minimize voltage transients and oscillations during fast switching, reducing the size of snubber components needed and overall power dissipation.

The STPS1150, STPS2150 and STPS3150 all offer a low VF for higher efficiency, a high maximum junction temperature of 175C and low leakage current. They are available in industry-standard surface-mount (SMA, SMB) and axial-lead (DO-201AD, DO-15, DO-41) packages. Prices range from 20 cents to 30 cents in quantities of 100,000 pieces.

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