ELECTRONIC CIRCUIT BOARD

PROBLEM TO BE SOLVED: To provide an electronic circuit board that improves the detection accuracy of a current detection circuit by preventing an effect on the current detection circuit by heat generated by a switching element and thereby prevents the deterioration of the control accuracy of a control circuit, without arranging a heat insulation area around the current detection circuit. SOLUTION: This electronic circuit board (10) is made up of the switching element (24) that is inserted in a conduction circuit at least from a power source (20) to a load (22), a detection resistor (26) that is connected in series to the load in the conduction circuit, the current detection circuit (30) that is connected to the detection resistor to detect a current value flowing into the load from a voltage drop in the detection resistor, and the control circuits (32, 34) that perform the duty drive of the switching element in such a way that the detected current value corresponds to a conduction command value to the load. In this board, the current detection circuit (30) is arranged near one side (10b) facing the side (10a) most adjacent to the arrangement position of the switching element (24). COPYRIGHT: (C)2007,JPO&INPIT