DESCRIPTION AND PRINCIPLE OFOPERATIONKELVIND (Tab, 3)G S (5) N-Channel MOSFET D2PAK-5S GD SENSE51 24 SENSE(2)KELVIN FIGURE 1. Package Information and Schematic SymbolPackage Information and Schematic Symbol, Figure1, shows aMOSFET, SUM50N03-13C. Gate, drain-stub/tab, and source(pins 1, 2, and 3) are in the same position as in a standard D2PAK(TO-263) MOSFET. However, pin-out modification is required toincorporate current-sense (pin 2) and Kelvin-to-source (pin 4)between gate and drain-stub and between drain-stub and source,respectively. See Application Note 826, Recommended MinimumPad Patterns With Outline Access for Vishay SiliconixMOSFETs (), for therecommended PCB layout dimensional details of the pad pattern.Modified-part library symbols for schematic symbol and PCBlayout are available on the Protel (PCB design software)platform. For soft copy, please contact Vishay Siliconix in SantaClara, Calif., in the United States, by phoning 1-408-567-8927.The Principle Behind the Current-Sen feature into anelectronic control circuit and avoiding catastrophic failuresresulting from overcurrent (overload) and/or short-circuitconditions. The device package is a modified D 2PAK with fivepins. The MOSFET termination retains the standard D2PAKfootprint for a three-pin device. The additional two pins providetermination for a current-sense output and an internal Kelvinconnection to the source. For current sensing, the MOSFETdesign employs a small number of the total number ofMOSFET cells in a known ratio. The latter define thecurrent-sense parameters. A typical control interface uses asimple circuit with an op-amp or a comparator. This approachoffers the freedom of control-level setting and facilitates itsincorporation into the DEVICE DESCRIPTION AND PRINCIPLE OFOPERATIONKELVIND (Tab, 3)G S (5) N-Channel MOSFET D2PAK-5S GD SENSE51 24 SENSE(2)KELVIN FIGURE 1. Package Information and Schematic SymbolPackage Information and Schematic Symbol, Figure1, shows aMOSFET, SUM50N03-13C. Gate AN606Vishay Siliconix Document Number: 71991 1