Patent ID: 8625308

Claim:
A soft-burst circuit for a switched-mode power supply, the circuit comprising: an integrated circuit configured to control switching of an output transistor to deliver a regulated output voltage to a load, the integrated circuit having a control pin for receiving a control signal for setting an operating frequency of the switched-mode power supply; a capacitor coupled to the control pin through a first resistor, the capacitor having a first terminal coupled in series to a first terminal of the first resistor; a first transistor having a first terminal coupled to receive the control signal; and a second transistor having a first terminal coupled to a second terminal of the first transistor, the first terminal of the second transistor being coupled to a reference signal, the second transistor having a second terminal coupled to the first terminal of the capacitor, the second transistor being configured to discharge the capacitor based on the control signal, a switching of the second transistor being controlled by the first transistor.