Feedback circuit and power supply device including the same
AssigneeFairchild Korea Semiconductor Ltd.
InventorsIn-Ki Park, Won-Seok Kang, Gye-Hyun Cho
Life of this patent
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Abstract
Disclosed are a feedback circuit and a power supply device including the same. The power supply device converts input voltage into output voltage suitable for load condition according to a switching operation of a power switch. The feedback circuit includes a first diode connected to a first sensing voltage corresponding to output voltage and a second diode connected to the output voltage. The feedback circuit generates feedback voltage by using voltage passing through a conducted diode of the first and the second diodes. The power supply device controls a switching operation of the power switch depending on the feedback voltage.
Claims17
A power supply device converting an input voltage into an output power according to a switching operation of a power switch, the power supply device comprising:
- a feedback circuit which includes a first diode connected to a first sensing voltage corresponding to an output voltage of the output power, a second diode connected to the output voltage, and a resistor in series with the second diode, the feedback circuit generates a feedback voltage by using a voltage generated from a current passing through a conducted diode of the first and the second diodes;
- and
- a switch controller controlling the switching operation of the power switch depending on the feedback voltage,
- wherein a cathode of each of the first to the second diodes is electrically connected to a first contact point, the first sensing voltage is inputted to an anode of the first diode, and the output voltage is inputted to an anode of the second diode.
A feedback circuit supplying a feedback voltage for controlling a switching operation of a power switch in a power supply device converting an input voltage into an output power according to the switching operation of the power switch, the feedback circuit comprising:
- a voltage feedback unit generating a first sensing voltage corresponding to an output voltage of the output power;
- a first diode connected to the first sensing voltage;
- and
- a second diode connected to the output voltage and in series with a resistor,
- wherein the feedback voltage is generated by using a voltage generated from a current passing through a conducted diode of the first and the second diodes,
- wherein a cathode of each of the first to the second diodes is electrically connected to a first contact point, the first sensing voltage is inputted to an anode of the first diode, and the output voltage is inputted to an anode of the second diode.
Dependencies are inferred from the claim text.