Step-down switching circuit
First Claim
1. 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.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
20 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification