Infineon Technologies Ag

Winand Van Sloten

Cristian Garbossa

Marco Flaibani

Stefano Orlandi

Davide Dal Bianco

Tommaso Pieretti

Giuseppe Loccia

Marco Vanin

Filippo Boera

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.

Peak detection for current mode control in a power converter system

A circuit for controlling a switch of a power converter includes a first clock signal generator configured to generate a first clock signal and a switching signal generator configured to generate a switching signal to control the switch of the power converter based on the first clock signal. The circuit further includes error detection circuitry configured to output an error indication and a second clock signal generator configured to generate, in response to the error indication, a second clock signal that comprises an edge of a clock cycle of the second clock signal that corresponds to when the switching signal deactivates the switch of the power converter plus a time delay. The switching signal generator is configured to generate the switching signal to control the switch of the power converter further based on the second clock signal in response to the error indication being output by the error detection circuitry.

Error detection for power converter

In accordance with one embodiment, a switching converter includes a switching circuit configured to receive a switching signal and to alternatingly connect an output node of the switching circuit with a supply node and a reference node in accordance with the switching signal. An input voltage is operably applied between the supply node and the reference node. The switching converter further includes an inductor coupled between the output node of the switching circuit and an output node of the switching converter as well as an oscillator configured to generate a clock signal with an oscillator frequency depending on the input voltage. A switching controller is configured to receive the clock signal and to generate the switching signal using pulse-width modulation (PWM), wherein the frequency of the switching signal is set in accordance with the oscillator frequency and a duty cycle of the switching signal is deter-mined using current-mode control.

Switching converter using pulse-width modulation and current-mode control

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Padua, Italy

Winand Van Sloten