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首页> 外文期刊>IEEE Journal of Solid-State Circuits >Fixed-Switching-Frequency Background Capacitor-Current-Sensor Calibration for DC–DC Converters
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Fixed-Switching-Frequency Background Capacitor-Current-Sensor Calibration for DC–DC Converters

机译：Fixed-Switching-Frequency Background Capacitor-Current-Sensor Calibration for DC–DC Converters

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摘要

Background capacitor-current-sensor (CCS) calibration (CAL) is proposed for dc–dc converters to achieve fast load-transient response for small undershoot $V_{mathrm {US}}$ , overshoot $V_{mathrm {OS}}$ , and short settling time $t_{mathrm {S}}$ in the output voltage $V_{mathrm {O}}$ . The CCS’ impedance $Z_{mathrm {Cs}}$ is calibrated to a scaled replica of the output capacitor’s impedance $Z_{mathrm {Co}}$ , which varies with printed-circuit-board parasitics, process-voltage-temperature variations, and aging. Thus, the CCS shunts a current $I_{mathrm {Cs}}$ equal to a scaled output-capacitor current $I_{mathrm {Co}}$ , which instantly and accurately reflects load-current $I_{mathrm {load}}$ transients. The CAL operates at a fixed switching frequency $f_{mathrm {SW}}$ . At this $f_{mathrm {SW}}$ , although $Z_{mathrm {Cs}}$ is dominated by its inductive part, this work can still calibrate its capacitive and resistive parts based on the time derivatives dVO/dt and dICs/dt, respectively. This fixed- $f_{mathrm {SW}}$ CAL overcomes the bottleneck of the prior state-of-the-art CCS CAL, which must hop

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