DRIVE CONTROL CIRCUIT, CONTROLLER, SWITCHING POWER SUPPLY DEVICE, AND CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a drive control circuit that can perform a predetermined operation according to a high-side drive signal SDH and a low-side drive signal SDL even if a midpoint potential VS suddenly changes due to sudden change of an input voltage or off-resonance during load short circuit.

SOLUTION: A drive control circuit 101 has a resistance control circuit 2 that reduces a resistance value between one end of a first MOS transistor M1 and a second potential line 9 according to a state detection signal Des which is derived from detection of a state of a resonance circuit connected to an intermediate terminal X between a high-side switch element Q1 and a low-side switch element Q2.

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