SWITCHING POWER SUPPLY, CONTROL CIRCUIT FOR CONTROLLING SWITCHING POWER SUPPLY, CONTROL METHOD OF SWITCHING POWER SUPPLY AND MODULE SUBSTRATE

摘要

The present invention is a switching power supply including: a first switch (SW 1) provided between a positive terminal (N21) of a DC power supply and a positive terminal (N31) of a load; a second switch (SW2) connected in parallel with the first switch (SW1); a first capacitor (C1) provided between the second switch (SW2) and a node (N13) of the first switch (SW1) on a DC power supply side; a first inductor (L1) provided between the first capacitor (C1) and the positive terminal (N21) of the DC power supply; and a control circuit 49 that turns off the second switch after the first switch is turned off and when or before a voltage across the first capacitor becomes zero, a control circuit for controlling the switching power supply, a control method of switching the power supply, and a module substrate.