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公开(公告)号：US10797598B1
公开(公告)日：2020-10-06
申请号：US16601640
申请日：2019-10-15
Applicant: Microchip Technology Incorporated
Abstract: According to an aspect of one or more exemplary embodiments, there is provided a constant on-time controller for a buck converter with calibrated ripple injection in continuous conduction mode. The constant on-time controller may include a pulse width modulator (PWM) comparator that generates an on-time request, an error amplifier that regulates an average feedback voltage to an internal reference voltage, and passes a feedback node ripple signal to an input of the PWM comparator, an on-time generator that outputs an on-time signal that controls an on-time of the buck converter based on the on-time request, a MOSFET driver that drives the buck converter based on the output of the on-time generator, and an injection signal generator coupled to the on-time generator, wherein the injection signal generator may include a first switch and a second switch, a fixed signal generator, and a bias current source.
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公开(公告)号：US10965215B2
公开(公告)日：2021-03-30
申请号：US16657071
申请日：2019-10-18
Applicant: Microchip Technology Incorporated
Abstract: According to an aspect of one or more exemplary embodiments, there is provided a constant on-time buck converter with calibrated ripple injection having improved light load transient response and reduced output capacitor size. The constant on-time buck converter may include a controller having a pulse width modulator (PWM) comparator that generates an on-time request, an error amplifier that regulates an average feedback voltage to an internal reference voltage, and passes a feedback node ripple signal to an input of the PWM comparator, an on-time generator that outputs an on-time signal that controls an on-time of the buck converter based on the on-time request, a MOSFET driver that drives the buck converter based on the output of the on-time generator, a zero crossing detection circuit configured to detect when a current through an inductor of the buck converter equals zero, and an injection signal generator coupled to the on-time generator, and that is configured to output an injection signal that limits a dip in an output voltage of the buck converter during a load transient based on an output of the zero crossing detection circuit indicating that the current through the inductor of the buck converter equals zero. The error amplifier may receive a feedback voltage based on the output of the injection signal generator and based on the output voltage of the buck converter.
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公开(公告)号：US20210050790A1
公开(公告)日：2021-02-18
申请号：US16657071
申请日：2019-10-18
Applicant: Microchip Technology Incorporated
Abstract: According to an aspect of one or more exemplary embodiments, there is provided a constant on-time buck converter with calibrated ripple injection having improved light load transient response and reduced output capacitor size. The constant on-time buck converter may include a controller having a pulse width modulator (PWM) comparator that generates an on-time request, an error amplifier that regulates an average feedback voltage to an internal reference voltage, and passes a feedback node ripple signal to an input of the PWM comparator, an on-time generator that outputs an on-time signal that controls an on-time of the buck converter based on the on-time request, a MOSFET driver that drives the buck converter based on the output of the on-time generator, a zero crossing detection circuit configured to detect when a current through an inductor of the buck converter equals zero, and an injection signal generator coupled to the on-time generator, and that is configured to output an injection signal that limits a dip in an output voltage of the buck converter during a load transient based on an output of the zero crossing detection circuit indicating that the current through the inductor of the buck converter equals zero. The error amplifier may receive a feedback voltage based on the output of the injection signal generator and based on the output voltage of the buck converter.
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