Patent ID: 6316922
Filing Date: 2001-11-13
Classification: H02M

Abstract:
A switching DC-DC converter including a one-chip semiconductor integrated circuit; said one-chip semiconductor integrated circuit including at least a main switching semiconductor device including main terminals and a control terminal, said main switching semiconductor device periodically switching on and off, thereby to periodically connect and disconnect a DC power supply, said main switching semiconductor device feeding an output voltage to a load; a control circuit fed from said DC power supply, said control circuit detecting said output voltage outputted from said main switching semiconductor device, said control circuit outputting a control signal indicating the timing of said switching on and off; and a first drive circuit fed from said DC power supply, said first drive circuit feeding a drive signal for switching on and off said main switching semiconductor device to said control terminal thereof in response to said control signal; said switching DC-DC converter comprising:a positive feed line and a negative feed line connecting said DC power supply to said control circuit including attached passive components thereof; anda resistor inserted in one of said positive feed line and said negative feed line inside or outside said semiconductor integrated circuit, said resistor preventing a noise current from flowing into said control circuit.