FILTER COIL, LOW-PASS FILTER AND BTL OUTPUT CLASS D AMPLIFIER

摘要

PURPOSE: To reduce a mounting area and cost and to prevent unnecessary radiation. CONSTITUTION: This filter coil comprises a low-pass filter for removing carrier frequency that is provided in the output stage of a BTL output type class D amplifier. A plurality of paired coils 100 and 101 (102 and 103) of which winding directions are different from each other and which have the same inductance are arranged adjacent to each other along the axial direction, and a magnetic shield wall 120 is provided between different coil pairs and the whole body is housed in one package 110.