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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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公开(公告)号：US20210367519A1
公开(公告)日：2021-11-25
申请号：US17101498
申请日：2020-11-23
Applicant: Microchip Technology Incorporated
Inventor： Surya Prakash Rao Talari , Alexander Mednik , Ioan Stoichita
Abstract: A multi-phase DC-to-DC controller is provided. The controller includes a plurality of current sense circuits that sense current in respective converter cell of the converter, and generate respective current sense signals, an averaging circuit that receives the respective current sense signals and generates an average signal, a plurality of error detector circuits that compare respective current sense signals with the average signal and generate respective voltage imbalance signals, a plurality of transconductor circuits that convert respective voltage imbalance signals to respective current imbalance signals, and a plurality of pulse width modulation (PWM) generators that output PWM signals to control respective converter cells based on a comparison between a ramp threshold voltage of the PWM generators and a PWM ramp voltage that is based on the sum of one of the respective current imbalance signals and a first current that is proportional to the input voltage.
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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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