Evaluation of Low Voltage MOSFETs Optimised for Improved Current Sharing

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In high power Motor Control applications requiring the use of MOSFETs connected in parallel, there is a common request for semiconductor manufacturers to provide parts with matched Vgs threshold voltage. However, even with very tightly controlled production facilities there is an inevitable spread in the threshold voltage across the wafer and any effort to provide matched Vth may require special screening and sorting that could result in Yield loss, thus affecting the cost of the products supplied. In this paper, MOSFETs developed to have improved current sharing capability when used in parallel are demonstrated to remove the need for matching threshold voltages.