re - zatorimingu manner and device null of film

摘要

PURPOSE: To prevent the failure to make accurate trimming by the erroneous operation of an electric circuit based on a laser beam. ;CONSTITUTION: A trimming operation is conducted by projecting a laser beam on a thick film resistor R₁ or R₂. This trimming operation makes progress while the output of the control circuit 1, to be used for a switching regulator and containing the thick film resistors R₁ and R₂, is being measured. The input voltage of the control circuit 1 is interrupted in synchronization with the projection of the laser beam, and the erroneous operation of the control circuit 1 can be prevented.;COPYRIGHT: (C)1993,JPO&Japio