SWITHCHING MODE POWER SUPPLY, AND METHOD FOR REDUCING NOISE USING THE SAME

摘要

PURPOSE: A switching mode power supply device and a method for attenuating a noise using the same are provided to reduce a switching noise by shorting a field effect transistor and a heat sink with a ground pattern and a chip bead. CONSTITUTION: A heat sink(110) discharges heat from a switching mode power supply device. A ground(170) is connected to a field effect transistor. A field effect transistor includes a first field effect transistor and a second field effect transistor. A chip bead(190) reduces a switching noise. The chip bead directly connects the heat sink to the ground connected to the field effect transistor.