New protectifiers by Diotec combine the low forward voltage drop of a Schottky diode with the robust reverse characteristic of a transient voltage suppressor (TVS).
The new devices are suitable for low-loss rectification in circuits with reverse over-voltage surges. Typical applications are output rectifiers in switched mode power supplies, free-wheeling diodes for motors and inductors or diodes for reverse polarity protection.
The TSK2520D2 is a 25 A/20 V device in a TO-263AB package, with a forward voltage of <0,55 V at 25 A and <0,45 V at 5 A. It is characterised up to 600 W reverse peak pulse power on a 10/1000 μs pulse; forward surges can be up to 300 A for 10 ms. The reverse recovery time is as low as that of a Schottky diode.
The KT20A150 is a 20 A/150 V rated part in a TO-220AC package. It has a maximum working voltage of 150 V and a VF of <0,98 V at 20 A and <0,85 V at 5 A. It is specified for 800 W reverse peak power on a 10/1000 μs pulse, and is suitable for rugged industrial environments. Reverse recovery time is <250 ns and as such it can be used in systems up to 40 kHz. A special feature of the KT20 series is that it comes in two versions, one with the anode connected to the heatsink, the other with the cathode connected to the heatsink.
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