Ultrafast rectifiers reduce power losses

28 June 2006 Power Electronics / Power Management

Vishay Intertechnology has added a pair of new ultrafast rectifier devices to its range that have extremely fast reverse and forward recovery times and low forward voltage drop. The new 8 A, 600 V UH8JT and UHF8JT single high-voltage ultrafast rectifiers deliver a reverse recovery time of 25 ns. This improved switching performance combines with a forward recovery time of 150 ns under LEM test conditions (IF = 8 A, di/dt = 64 A/μs, VF = 1,1 x VF max), and a low forward voltage drop rating of 1,85 V at 125°C, to enable better thermal performance and better system efficiency. Built using planar chip junction technology, the rectifiers can be used for a range of power supply applications, including high-voltage continuous-current-mode power factor correction (CCM PFC) systems; high-voltage output switchmode power supplies; secondary DC-DC rectification applications; and freewheeling diode applications. The UH8JT (TO-220AC) and UHF8JT (ITO-220AC) feature a maximum junction temperature of 175°C

www.vishay.com

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