DC-DC Converter
First Claim
1. A DC-DC converter, characterized by comprising:
- an error amplifier for outputting an error between an output voltage and a predetermined voltage;
a phase compensation impedance element for performing phase compensation, and for accumulating the error across one end to generate an error voltage;
a determination unit for monitoring a voltage output of the error amplifier to determine whether the voltage output of the error amplifier is higher, or lower than a reference voltage according to the predetermined voltage, and for outputting a determination signal indicating results of the determination; and
a voltage setting unit for setting a voltage at one end of the phase compensation impedance element higher than a lower output voltage limit of the error amplifier when the determination signal indicates that the voltage output of the error amplifier is lower than the reference voltage, or for canceling the setting of the voltage when the determination signal indicates that the voltage output of the error amplifier is higher than the reference voltage.
1 Assignment
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Accused Products
Abstract
A DC-DC converter includes: an error amplifier for outputting an error between an output voltage and a predetermined voltage; a phase compensation impedance element for accumulating the error across one end to generate an error phase; a determination unit for determining whether the voltage output by the error amplifier is higher, or lower than a reference voltage that is consonant with the predetermined voltage, and outputting a determination signal indicating determination results; and a voltage setting unit for setting a voltage for one end of the phase compensation impedance element higher than a lower output voltage limit for the error amplifier when the determination signal indicates that the voltage output by the error amplifier is lower than the reference voltage, or for canceling setting of the voltage when the determination signal indicates that the voltage output by the error amplifier is higher than the reference voltage.
19 Citations
21 Claims
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1. A DC-DC converter, characterized by comprising:
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an error amplifier for outputting an error between an output voltage and a predetermined voltage; a phase compensation impedance element for performing phase compensation, and for accumulating the error across one end to generate an error voltage; a determination unit for monitoring a voltage output of the error amplifier to determine whether the voltage output of the error amplifier is higher, or lower than a reference voltage according to the predetermined voltage, and for outputting a determination signal indicating results of the determination; and a voltage setting unit for setting a voltage at one end of the phase compensation impedance element higher than a lower output voltage limit of the error amplifier when the determination signal indicates that the voltage output of the error amplifier is lower than the reference voltage, or for canceling the setting of the voltage when the determination signal indicates that the voltage output of the error amplifier is higher than the reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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11. A DC-DC converter, which sets, when an input voltage input at an input terminal is higher than a predetermined voltage, bypass mode for outputting the input voltage, unchanged, from an output terminal as an output voltage, or sets, when the input voltage is lower than the predetermined voltage, boost mode for increasing the input voltage and outputting the output voltage from the output terminal, characterized by comprising:
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an error amplifier for outputting an error between the output voltage and the predetermined voltage; a phase compensation impedance element for performing phase compensation, and for accumulating the error across one end to generate an error voltage; a determination unit for monitoring a voltage output by the error amplifier, and for determining whether the bypass mode or the boost mode is currently set, and outputting a determination signal indicating obtained determination results; a first switch connected between output of the error amplifier and one end of the phase compensation impedance element; and a second switch connected between one end and the other end of the phase compensation impedance element, wherein when the determination signal indicates the bypass mode is currently set, the first switch is turned off and the second switch is turned on, or when the determination signal indicates the boost mode is currently set, the first switch is turned on and the second switch is turned off.
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12. A DC-DC converter, which sets, when an input voltage input at an input terminal is higher than a predetermined voltage, bypass mode for outputting the input voltage, unchanged, from an output terminal as an output voltage, or sets, when the input voltage is lower than the predetermined voltage, boost mode for increasing the input voltage and outputting the output voltage from the output terminal, characterized by comprising:
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an error amplifier for outputting an error between the output voltage and the predetermined voltage; a phase compensation impedance element for performing phase compensation, and accumulating the error across one end to generate an error voltage; a determination unit for monitoring a voltage output by the error amplifier, and for determining whether the bypass mode or the boost mode is currently set, and outputting a determination signal indicating obtained determination results; a first switch connected between output of the error amplifier and one end of the phase compensation impedance element; a second switch connected between one end of the phase compensation impedance element and a node having a voltage higher than a voltage at the other end of the phase compensation impedance element, wherein when the determination signal indicates the bypass mode is currently set, the first switch is turned off and the second switch is turned on, or when the determination signal indicates the boost mode is currently set, the first switch is turned on and the second switch is turned off.
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Specification