A control method for a power supply apparatus, the power supply apparatus comprising a resonant converter, wherein the control method comprises steps of: sampling at least one of an output voltage or an output current of the resonant converter; generating an error signal (Verror) according to a reference value (Vref) and at least one of the output voltage or the output current; generating a first switching signal and a chopping signal (Vch) according to the error signal (Verror) while the resonant converter is in a burst mode, wherein the first switching signal has a switching period (Tm), the switching period (Tm) is fixed, the chopping signal (Vch) has a chopping period and a duty cycle, and the chopping period and the duty cycle are dynamically adjusted according to the error signal (Verror), wherein the chopping period has an on period (Ton) and an off period (Toff), wherein while the duty cycle is lower than 50%, the on period (Ton) is set to be an integer multiple of the switching period (Tm) of the first switching signal, and the off period (Toff) is adjusted according to the error signal (Verror), wherein while the duty cycle is higher than 50%, the off period (Toff) is set to be an integer multiple of the switching period (Tm) of the first switching signal, and the on period (Ton) is adjusted according to the error signal (Verror); and generating a second switching signal according to the chopping signal (Vch) and the first switching signal by a logic computation unit after a logic AND operation is performed, wherein a switch unit of the resonant converter is turned on or turned off according to the second switching signal, wherein the logic computation unit comprises a driving circuit, wherein an input terminal of the driving circuit receives the first switching signal, an enabling terminal of the driving circuit receives the chopping signal (Vch), and the second switching signal is output from an output terminal of the driving circuit. sampling at least one of an output voltage or an output current of the resonant converter; generating an error signal (Verror) according to a reference value (Vref) and at least one of the output voltage or the output current; generating a first switching signal and a chopping signal (Vch) according to the error signal (Verror) while the resonant converter is in a burst mode, wherein the first switching signal has a switching period (Tm), the switching period (Tm) is fixed, the chopping signal (Vch) has a chopping period and a duty cycle, and the chopping period and the duty cycle are dynamically adjusted according to the error signal (Verror), wherein the chopping period has an on period (Ton) and an off period (Toff), wherein while the duty cycle is lower than 50%, the on period (Ton) is set to be an integer multiple of the switching period (Tm) of the first switching signal, and the off period (Toff) is adjusted according to the error signal (Verror), wherein while the duty cycle is higher than 50%, the off period (Toff) is set to be an integer multiple of the switching period (Tm) of the first switching signal, and the on period (Ton) is adjusted according to the error signal (Verror); and generating a second switching signal according to the chopping signal (Vch) and the first switching signal by a logic computation unit after a logic AND operation is performed, wherein a switch unit of the resonant converter is turned on or turned off according to the second switching signal, wherein the logic computation unit comprises a driving circuit, wherein an input terminal of the driving circuit receives the first switching signal, an enabling terminal of the driving circuit receives the chopping signal (Vch), and the second switching signal is output from an output terminal of the driving circuit.