Power supply circuit and power supply device
AssigneeRohm Co., Ltd.
InventorHiroki INOUE
Life of this patent
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Abstract
A power supply circuit according to the present invention includes, for example, an output circuit arranged to generate a stabilized voltage from an input voltage using an output transistor, a filter circuit arranged to smooth the stabilized voltage using a resistor and a capacitor so as to generate an output voltage, and a charging circuit arranged to supply charging current to the capacitor without the charging current being passed through the resistor.
Claims22
A power supply circuit comprising:
- an output circuit arranged to generate a stabilized voltage from an input voltage using an output transistor:
- a filter circuit arranged to smooth the stabilized voltage using a resistor and a capacitor so as to generate an output voltage;
- and
- a charging circuit arranged to supply charging current to the capacitor without the charging current being passed through the resistor.
A power supply device comprising an internal power supply circuit arranged to generate an internal reference voltage or an internal power supply voltage, wherein the internal power supply circuit is the power supply circuit according to claim
A power supply circuit arranged to generate a stabilized voltage from an input voltage, the power supply circuit comprising:
- an output transistor having a first electrode receiving the input voltage, a second electrode, and a control electrode;
- a first node connected to the second electrode of the output transistor directly or via an inserted resistor;
- a control circuit arranged to supply a control voltage based on a feedback voltage corresponding to a voltage at the first node to the control electrode of the output transistor so as to control a state of the output transistor;
- a filter circuit having a filter resistor and a filter capacitor, arranged to smooth the voltage at the first node so as to generate the stabilized voltage at a second node;
- and
- a charging transistor disposed between the first node and the second node, a state of the charging transistor being controlled on the basis of a voltage drop at the inserted resistor, wherein
- when the charging transistor is on state, the filter capacitor is charged through the charging transistor.
A power supply circuit arranged to generate a stabilized voltage from an input voltage, the power supply circuit comprising:
- an output transistor having a first electrode receiving the input voltage, a second electrode, and a control electrode:
- a first node connected to the second electrode of the output transistor via an inserted resistor;
- a control circuit arranged to supply a control voltage based on a feedback voltage corresponding to a voltage at the first node to the control electrode of the output transistor so as to control a state of the output transistor;
- a filter circuit having a filter resistor and a filter capacitor, arranged to smooth the voltage at the first node so as to generate the stabilized voltage at a second node;
- and
- a charging transistor disposed between the first node and the second node, a state of the charging transistor being controlled on the basis of a voltage drop at the inserted resistor, wherein
- when the charging transistor is on state, the filter capacitor is charged through the charging transistor.
Dependencies are inferred from the claim text.