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Details for Patent: 8,446,138

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Details for Patent: 8,446,138

Title:Stability compensation circuit and DC-DC converter including the same
Abstract: A stability compensation circuit and a DC-DC converter including the same are provided. When an output voltage of the DC-DC converter decreases more than a predetermined value, the stability compensation circuit quickly charges an integral capacitor by using an additional converter or by reducing an effective resistance of a charging circuit which charges the capacitor. Since an output voltage of an integrator in the stability compensation circuit is enabled to quickly reach a control voltage, the instant decrease of the output voltage of the DC-DC converter can be quickly compensated for.
Inventor(s): Ryoo; Ji Yeoul (Hwaseong-si, KR)
Assignee: Samsung Electronics Co., Ltd. (KR)
Filing Date:Aug 31, 2009
Application Number:12/584,102
Claims:1. A stability compensation circuit comprising: a first converter configured to generate a first current corresponding to a voltage difference between an input voltage and a reference voltage; a second converter configured to generate a second current corresponding to the voltage difference when the voltage difference exceeds a predetermined value; and a charging circuit configured to receive the first current generated from the first converter and the second current generated from the second converter and increase an internal charge voltage, wherein the charging circuit comprises a resistor connected between an output terminal of the first converter and an output terminal of the second converter and a capacitor connected between the output terminal of the second converter and a reference node.

2. A stability compensation circuit comprising: a first converter configured to output a current corresponding to a voltage difference between an input voltage and a reference voltage; an integration circuit configured to output an integration voltage based on the voltage difference; and a sensing circuit coupled between the output of the integration circuit and the output of the first converter, the sensing circuit configured to sense a voltage difference between an output voltage of the integration circuit and an output voltage of the first converter, generate a control signal for controlling the voltage difference between the output voltage of the integration circuit and the output voltage of the first converter, and output the control signal to the integration circuit.

3. The stability compensation circuit of claim 2, further comprising a second converter configured to generate a current corresponding to a voltage difference between the output voltage of the integration circuit and the reference voltage.

4. The stability compensation circuit of claim 2, wherein the integration circuit comprises: an integrator configured to generate the output voltage of the integration circuit; and a resistance circuit configured to control current supplied to the integrator by controlling a resistance value in response to the control signal.

5. The stability compensation circuit of claim 4, wherein the integration circuit further comprises a switch which is turned on or off in response to the control signal output from the sensing circuit and controls the resistance value by turning on or off the switch in response to the control signal.

6. The stability compensation circuit of claim 2, wherein the sensing circuit comprises: a sense resistor configured to measure the voltage difference between the output voltage of the integration circuit and the output voltage of the first converter; and a comparator configured to compare the voltage difference measured by the sense resistor with a predetermined value and output the control signal based on a result of the comparison.

7. The stability compensation circuit of claim 6, wherein the comparator outputs the control signal when the voltage difference measured by the sense resistor exceeds the predetermined value.

8. A DC-DC converter comprising: a ramp generator configured to output a ramp signal; a stability compensation circuit configured to receive at least part of an output voltage of the DC-DC converter as a feedback voltage and perform stability compensation based on the feedback voltage and a reference voltage; a comparator configured to compare a control voltage of the stability compensation circuit with the ramp signal output from the ramp generator, determine a pulse width based on a result of the comparison, and output a signal having the pulse width; and a main switch operating circuit configured to receive the signal from the comparator and drive at least one switch among a plurality of main switches which control transmission of the signal, wherein the stability compensation circuit comprises: a first converter configured to generate a first current corresponding to a voltage difference between the feedback voltage and the reference voltage; a second converter configured to generate a second current corresponding to the voltage difference when the voltage difference exceeds a predetermined value; and a charging circuit configured to receive the first current generated from the first converter and the second current generated from the second converter and increase an internal charge voltage, wherein the charging circuit comprises a resistor connected between an output terminal of the first converter and an output terminal of the second converter and a capacitor connected between the output terminal of the second converter and a reference node.

9. A DC-DC converter comprising: a ramp generator configured to output a ramp signal; a stability compensation circuit configured to receive at least part of an output voltage of the DC-DC converter as a feedback voltage and perform stability compensation based on the feedback voltage and a reference voltage; a comparator configured to compare a control voltage of the stability compensation circuit with the ramp signal output from the ramp generator, determine a pulse width based on a result of the comparison, and output a signal having the pulse width; and a main switch operating circuit configured to receive the signal from the comparator and drive at least one switch among a plurality of main switches which control transmission of the signal, wherein the stability compensation circuit comprises: a converter configured to output a current corresponding to a voltage difference between the feedback voltage and the reference voltage; an integration circuit configured to output an integration voltage based on the voltage difference; and a sensing circuit coupled between the output of the integration circuit and the output of the converter, the sensing circuit configured to sense a voltage difference between an output voltage of the integration circuit and an output voltage of the converter, generate a control signal for controlling the voltage difference between the output voltage of the integration circuit and the output voltage of the converter, and output the control signal to the integration circuit.
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