Digital boost feedback voltage controller for switch-mode power supplies using pulse-frequency modulation
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United States of America Patent
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Jan 29, 2013
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Jun 21, 2012
app pub date -
Dec 21, 2010
filing date -
Dec 21, 2010
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Abstract
A controller produces high-side and low-side control signals. The high and low-side signals are used to switch high-side and low-side transistors in the power stage to control the voltage across the power stage output capacitor of the power stage. A boost feedback charge pump receives the low or high-side signal to increase the charge on a charge pump output capacitor. The controller is configured to send Pulse Frequency Modulation (PFM) high and low-side signals that control the voltage on the power stage output capacitor and charge the charge pump output capacitor. The controller is also configured to send boost feedback (BFB) high and low-side signals that charge the boost feedback capacitor, but are designed to not significantly change the charge on the power stage output capacitor.
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