Fast transient load response device for switched-mode power supply
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United States of America Patent
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Jul 21, 2020
Grant Date -
Nov 14, 2019
app pub date -
Apr 25, 2019
filing date -
May 14, 2018
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Abstract
This specification discloses methods and systems for reducing negative undershoot during transient load response for a PWM (Pulse Width Modulation) boost power converter. In some embodiments, reduction of negative undershoot during transient load response is achieved by overriding the PWM duty cycle to a maximum duty cycle when VDDBOOST drops during load step. This maximum duty cycle (“max”) mode is triggered when VDDBOOST is within a hysteresis window. Setpoint for maximum duty cycle is versus DCDC converter output and input voltage. In some embodiments, a lookup table is implemented for determining the setpoint for maximum duty cycle.
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