Abstract: A circuit for controlling a switch of a power converter. The circuit includes loop control circuitry configured to generate a control signal based on a feedback signal for the power converter and undervoltage circuitry. The undervoltage circuitry is configured to compare a voltage for a capacitor of the power converter with a voltage threshold. The undervoltage circuitry is further configured to, in response to the voltage for the capacitor of the power converter being greater than the voltage threshold, generate a switching signal to drive a switch of the power converter based on the control signal. The undervoltage circuitry is further configured to, in response to the voltage for the capacitor of the power converter being less than the voltage threshold, generate the switching signal to drive the switch of the power converter to the switched-in state until an inductor current is greater than an electrical current threshold.

Abstract: In some examples, a device for controlling a transistor in a power converter system includes a first circuit configured to generate an error current based on a difference between a reference signal and a feedback signal, where the feedback signal depends on an output voltage of the power converter system. The device also includes a frequency generator configured to generate an activation signal based on the difference between the reference signal and the feedback signal. The device further includes a pedestal circuit configured to define a peak current threshold for the transistor based on an offset value. The device also includes a logic circuit configured to activate the transistor based on the activation signal and deactivate the transistor when a current sense signal reaches the defined peak current threshold, where the current sense signal is representative of a power current conducted by the transistor.

Abstract: In some examples, a device for controlling a transistor in a power converter system includes a first circuit configured to generate an error current based on a difference between a reference signal and a feedback signal, where the feedback signal depends on an output voltage of the power converter system. The device also includes a frequency generator configured to generate an activation signal based on the difference between the reference signal and the feedback signal. The device further includes a pedestal circuit configured to define a peak current threshold for the transistor based on an offset value. The device also includes a logic circuit configured to activate the transistor based on the activation signal and deactivate the transistor when a current sense signal reaches the defined peak current threshold, where the current sense signal is representative of a power current conducted by the transistor.