Compact Frequency Compensation Circuit And Method For A Switching Regulator Using External Zero
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United States of America Patent
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Issued Date -
May 21, 2009
app pub date -
Nov 16, 2007
filing date -
Nov 16, 2007
priority date (Note) -
Abandoned
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Abstract
A compensation circuit in a monolithic switching regulator controller being incorporated in a closed loop feedback system of a switching regulator includes error amplifier having an output terminal with an output impedance and a degeneration resistance terminal coupled to a first terminal of the switching regulator controller. The compensation circuit includes a first resistor and a first capacitor connected in series between the output terminal of the error amplifier and a ground potential. In operation, the first capacitor and the output impedance of the error amplifier operate to introduce a pole and the first resistor and the first capacitor operate to introduce a first zero in the closed loop feedback system. When a second capacitor is coupled to the first terminal of the switching regulator controller, a second zero is introduced in the closed loop feedback system. The second capacitor is an off-chip capacitor formed external to the monolithic switching regulator controller.
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