SEMICONDUCTOR ELEMENT FOR CURRENT CONTROL AND CONTROL DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor element for current control that can remove temperature distribution dependence of a sense ratio and enhance the precision of current detection based on sense MOSFET.

SOLUTION: A semiconductor element 1 for current control has a main MOSEFT 7 for driving current on the same semiconductor chip, and a sense MOSFET 8 which is connected to the main MOSFET 7 in parallel and distributes current of the main MOSFET to perform current detection. The main MOSFET has plural channels and is formed by using multi-finger MOSFET arranged on a line. When the distance from the center of the muti-finger MOSFET 7 to the farthest channel is represented by L, the channel nearest to a position of L/(√3) from the center of the multi-finger MOSFET is used as the channel of the sense MOSFET 8.

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