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Current-sensing power MOSFETs

Posted: 08 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:MOSFET design? op-amp?

Vishay Siliconix current-sensing power MOSFETs offer a simple means of incorporating a protection feature into an electronic control circuit and avoiding catastrophic failures resulting from overcurrent (overload) and/or short-circuit conditions. The device package is a modified D2PAK with five pins.

The MOSFET termination retains the standard D2PAK footprint for a three-pin device. The additional two pins provide termination for a current-sense output and an internal Kelvin connection to the source. For current sensing, the MOSFET design employs a small number of the total number of MOSFET cells in a known ratio. The latter define the current-sense parameters.

A typical control interface uses a simple circuit with an op-amp or a comparator. This approach offers the freedom of control-level setting and facilitates its incorporation into the main control system.

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