CONTROL CIRCUIT OF MOS SEMICONDUCTOR ELEMENT

摘要

PURPOSE: To constitute a control circuit of an MOS semiconductor element having a load at a source terminal so that control by a signal related with one fixed potential can be attained without large costs. CONSTITUTION: A voltage source 16 having a floating potential is connected through a first controllable switch 7 between the gate terminal and source terminal of an MOS semiconductor element 1, and the first controllable switch 7 is controlled by one input voltage related with a fixed potential by a second controllable switch 8, and the second controllable switch 8 is constituted so that the output voltage can be always within the potential of a supply voltage source.