Step-down switching circuit
AssigneeKabushiki Kaisha Toshiba
InventorYoichi Tokai
Life of this patent
Estimating the term…
Abstract
The step-down switching circuit includes an amplifier capacitor having a first end connected to the feedback terminal and a second end connected to a second input of the amplifier. The step-down switching circuit includes a first resistor having a first end connected to the first end of the amplifier capacitor. The step-down switching circuit includes a second resistor having a first end connected to a second end of the first resistor and a second end connected to an output of the amplifier. The step-down switching circuit includes a third resistor having a first end connected to the second end of the first resistor and a second end connected to the second end of the amplifier capacitor.
Claims20
A step-down switching circuit comprising:
- a first switch element having a first end connected to an input terminal supplied with a power supply voltage and a second end connected to a switch terminal connectable to an inductor between the switch terminal and a feedback terminal;
- a second switch element having a first end connected to the second end of the switch terminal and a second end connected to a ground terminal;
- an amplifier having a first input supplied with a reference voltage;
- an amplifier capacitor having a first end connected to the feedback terminal and a second end connected to a second input of the amplifier;
- a first resistor having a first end connected to the first end of the amplifier capacitor;
- a second resistor having a first end connected to a second end of the first resistor and a second end connected to an output of the amplifier;
- a third resistor having a first end connected to the second end of the first resistor and a second end connected to the second end of the amplifier capacitor;
- an oscillator that outputs a voltage of a triangular wave;
- a comparator that receives the voltage of the triangular wave and a voltage of an amplifier signal from the amplifier and outputs a comparison signal of the voltages;
- and
- a control circuit that complementarily turns on/off the first switch element and the second switch element based on the comparison signal outputted from the comparator.
A step-down switching circuit comprising:
- a first switch element having a first end connected to an input terminal supplied with a power supply voltage and a second end connected to a switch terminal connectable to an inductor between the switch terminal and a feedback terminal;
- a second switch element having a first end connected to the second end of the switch terminal and a second end connected to a ground terminal;
- an amplifier having a first input supplied with a reference voltage;
- an amplifier capacitor having a first end connected to the feedback terminal and a second end connected to a second input of the amplifier;
- a first resistor having a first end connected to the second end of the amplifier capacitor and a second end connected to an output of the amplifier;
- a second resistor having a first end connected to the first end of the amplifier capacitor and a second end connected to the second end of the amplifier capacitor;
- a third resistor having a first end connected to the first end of the second resistor and a second end connected to the second end of the first resistor;
- an oscillator that outputs a voltage of a triangular wave;
- a comparator that receives the voltage of the triangular wave and a voltage of an amplifier signal from the amplifier and outputs a comparison signal of the voltages;
- and
- a control circuit that complementarily turns on/off the first switch element and the second switch element based on the comparison signal outputted from the comparator.
Dependencies are inferred from the claim text.