MODULATION CIRCUIT FOR ENHANCED LOAD TRANSIENT RESPONSE
First Claim
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1. A circuit for improved output voltage response for load transients in a DC-DC converter, comprising:
- a driver circuit having a first input, a second input, and an output, the output coupled to drive a converter circuit;
a first control circuit coupled to the first input of the driver circuit and configured to generate a modulated signal by comparing an output voltage from the converter circuit with a first reference voltage; and
a second control circuit coupled to the second input of the driver circuit and configured to generate a DCM enable signal having a first state and a second state, wherein the DCM enable signal is in the second state when an abnormal circulating current is detected in an output filter of the converter, wherein the driver circuit operates in a continuous conduction mode when the DCM enable signal is in the first state and the driver circuit operates in a discontinuous conduction mode when the DCM enable signal is in the second state.
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Abstract
A circuit and method for providing improved load transient response in a DC-DC converter. A DCM modulator is incorporated into the converter controller to generate a DCM enable signal for the driver circuits for the converter. During normal operation, the DCM enable signal will remain in a first state and the driver circuits will operate in a continuous conduction mode. However, upon a load transient, the DCM enable signal will change to a second state and the driver circuits will operate in a discontinuous conduction mode.
8 Citations
20 Claims
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1. A circuit for improved output voltage response for load transients in a DC-DC converter, comprising:
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a driver circuit having a first input, a second input, and an output, the output coupled to drive a converter circuit; a first control circuit coupled to the first input of the driver circuit and configured to generate a modulated signal by comparing an output voltage from the converter circuit with a first reference voltage; and a second control circuit coupled to the second input of the driver circuit and configured to generate a DCM enable signal having a first state and a second state, wherein the DCM enable signal is in the second state when an abnormal circulating current is detected in an output filter of the converter, wherein the driver circuit operates in a continuous conduction mode when the DCM enable signal is in the first state and the driver circuit operates in a discontinuous conduction mode when the DCM enable signal is in the second state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A circuit for improved output voltage response for load transients in a DC-DC converter, comprising:
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a plurality of driver circuits, each driver circuit having a first input, a second input, and an output, each output coupled to drive a corresponding converter circuit; a first control circuit for generating a sequence of modulated signals, each modulated signal generated by comparing the output voltage from the corresponding converter circuit with the first reference voltage, each modulated signal coupled respectively to the first input of a corresponding driver circuit; a second control circuit commonly coupled to the second input of each driver circuit and configured to generate a DCM enable signal having a first state and a second state, wherein the DCM enable signal is in the second state when an abnormal circulating current is detected in an output filter of the converter, and wherein the driver circuit operates in a continuous conduction mode when the DCM enable signal is in the first state and the driver circuit operates in a discontinuous conduction mode when the DCM enable signal is in the second state. - View Dependent Claims (12, 13, 14, 15)
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16. A method for providing improved output voltage response for load transients in a DC-DC converter circuit, comprising:
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operating a driver circuit in a continuous conduction mode when an output voltage of the converter circuit exceeds a reference voltage; and operating the driver circuit in a discontinuous conduction mode when an abnormal circulating current is detected in an output filter of the converter circuit. - View Dependent Claims (17, 18, 19, 20)
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Specification