Switching power circuit
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsToshimasa Namekawa, Ryoma Matsuo, Katsumasa Tanaka
Life of this patent
Estimating the term…
Abstract
According to one embodiment, a switching power circuit, includes: a switching transistor that is connected between an input terminal and a node; a driving circuit that supplies a PWM driving signal to the switching transistor; and a phase compensation circuit that supplies a feedback voltage to an error amplifier, in which the properties of the phase compensation circuit are switched in accordance with the voltage of the node immediately before the switching transistor is turned on.
Claims20
A switching power circuit, comprising:
- a switching transistor in which a main current path is connected between an input terminal to which an input voltage is applied and a node;
- an inductor that is connected between an output terminal outputting an output voltage and the node;
- an error amplifier that outputs an instruction signal according to a difference between a feedback voltage of the output voltage and a reference voltage;
- a driving circuit that generates a driving signal of which a duty ratio is controlled in accordance with the instruction signal, and supplies the driving signal to the switching transistor;
- a phase compensation circuit that supplies the feedback voltage to the error amplifier;
- and
- a sensing circuit that senses a voltage of the node,
- wherein properties of the phase compensation circuit are switched in accordance with the voltage of the node immediately before the switching transistor is turned on.
A switching power circuit, comprising:
- an input terminal to which an input voltage is applied;
- a first switching transistor in which a main current path is connected between the input terminal and a node;
- a second switching transistor in which a main current path is connected between the node and a ground;
- an output terminal that outputs an output voltage;
- an inductor that is connected between the output terminal and the node;
- an error amplifier that outputs an instruction signal according to a difference between a feedback voltage of the output voltage and a reference voltage;
- a PWM signal generation circuit that generates a PWM signal of which a duty ratio is controlled in accordance with the instruction signal;
- a first driving signal generation circuit that generates a first driving signal for controlling On/Off of the first switching transistor, in response to output of the PWM signal generation circuit;
- a second driving signal generation circuit that generates a second driving signal for controlling On/Off of the second switching transistor, in response to the output of the PWM signal generation circuit;
- a phase compensation circuit that supplies the feedback voltage to the error amplifier;
- a sensing circuit that senses a voltage of the node;
- a switching circuit that switches properties of the phase compensation circuit, in accordance with the voltage of the node immediately before the first switching transistor is turned on;
- and
- a regulator circuit that regulates a duty ratio of the second driving signal generated by the second driving signal generation circuit, in accordance with the voltage of the node immediately after the second switching transistor is turned off.
Dependencies are inferred from the claim text.