VOLTAGE REGULATOR WITH PREVENTION FROM OVERVOLTAGE AT LOAD TRANSIENTS
First Claim
Patent Images
1. A voltage regulator comprising:
- a voltage converting circuit having an output terminal for supplying an output current at an output voltage to a load;
an event detecting circuit for detecting a transient of the load; and
a current sinking circuit for, in response to the transient of the load, allowing a current source to provide a finite and stable sink current flowing from the output terminal of the voltage converting circuit into a ground potential.
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Abstract
A voltage converting circuit has an output terminal for supplying an output current at an output voltage to a load. In response to a transient of the load, a current sinking circuit allows a current source to provide a sink current flowing from the output terminal of the voltage converting circuit into a ground potential. The sink current is finite and stable. When the output voltage decreases below a threshold voltage, the current sinking circuit allows the current source to keep providing the finite and stable sink current for an extension time, causing the output voltage to decrease from the threshold voltage to a regulated value.
30 Citations
20 Claims
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1. A voltage regulator comprising:
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a voltage converting circuit having an output terminal for supplying an output current at an output voltage to a load;
an event detecting circuit for detecting a transient of the load; and
a current sinking circuit for, in response to the transient of the load, allowing a current source to provide a finite and stable sink current flowing from the output terminal of the voltage converting circuit into a ground potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of preventing overvoltage of a voltage regulator having an output terminal for supplying an output current at an output voltage to a load, the method comprising:
allowing a current source to provide a finite and stable sink current flowing from the output terminal of the voltage converting circuit into a ground potential when the output voltage increases over a predetermined threshold voltage. - View Dependent Claims (14, 15, 16)
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17. A voltage regulator comprising:
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a current channeling circuit having an input terminal for receiving an input voltage, an output terminal for supplying an output current at an output voltage to a load, and a control terminal;
a feedback circuit for generating a feedback voltage representative of the output voltage;
a differential amplifying pair for generating an error voltage representative of a difference between the feedback voltage and a predetermined reference voltage, the error voltage being applied to the control terminal of the current channeling circuit, and the differential amplifying pair for distributing a first current and a second current in accordance with the output voltage and the predetermined reference voltage;
a current comparator for comparing the first current and the second current;
a discharge controlling circuit controlled by the current comparator for generating a discharge control signal; and
a switchable current source for, in response to the discharge control signal, allowing a current source to provide a finite and stable sink current flowing from the output terminal of the current channeling circuit into a ground potential. - View Dependent Claims (18, 19, 20)
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Specification