Power supply circuit with high speed response to large rush voltage in power supply
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorChen Kong Teh
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Abstract
A power supply circuit in an embodiment includes a first transistor controlled to be turned on and off by a control signal supplied to a gate to output an output voltage following a predetermined voltage, a second transistor, one end of a current path of which is connected to an input terminal for supplying a power supply voltage, the second transistor outputting the predetermined voltage according to the control signal, and an amplifier circuit configured to amplify a voltage difference between a reference voltage and the predetermined voltage, and output the voltage difference as the control signal.
Claims2
A power supply circuit comprising:
- a first transistor controlled to be turned on and off by a control signal supplied to a gate to output an output voltage following a predetermined voltage;
- a second transistor, one end of a current path of the second transistor being connected to an input terminal for supplying a power supply voltage, the second transistor outputting the predetermined voltage according to the control signal;
- an amplifier circuit configured to amplify a voltage difference between a reference voltage and the predetermined voltage, and output the voltage difference as the control signal;
- a third transistor, one end of a current path of the third transistor being connected to an output terminal of the amplifier circuit, another end of the current path of the third transistor being connected to a reference potential point, the third transistor being turned on and off according to a gate voltage;
- and
- a capacitor connected between the input terminal for the power supply voltage and a gate of the third transistor.
Dependencies are inferred from the claim text.