Method and circuit for controlling DC-DC converter
First Claim
1. A DC-DC converter generating an output voltage from an input voltage, the DC-DC converter comprising:
- a first transistor receiving the input voltage;
a second transistor coupled to the first transistor;
a choke coil including a first terminal coupled to a connection node between the first and second transistors and a second terminal outputting the output voltage;
an error amplification circuit comparing the output voltage and a first reference voltage to generate an error signal;
a pulse signal generation circuit generating a first pulse signal that is in accordance with the error signal;
a comparison circuit comparing the error signal and a second reference voltage to generate a comparison result signal, the comparison result signal being in either one of a first logic state and a second logic state;
a drive signal generation circuit receiving the comparison result signal and generating either one of a constant level signal and a second pulse signal, with the drive signal generation circuit generating the constant level signal when receiving the comparison result signal in the first logic state and generating the second pulse signal when receiving the comparison result signal in the second logic state; and
an output circuit receiving the first pulse signal and either one of the constant level signal and the second pulse signal and generating first and second drive signals respectively driving the first and second transistors, with the output circuit generating the second drive signal in accordance with the first pulse signal when receiving the constant level signal and generating the second drive signal with the first and second pulse signals when receiving the second pulse signal.
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Abstract
A DC-DC converter reducing reversed current in a low load state and increasing output voltage response speed. An error amplification circuit generates an error signal from the output voltage. A pulse signal generation circuit generates a first pulse signal in accordance with the error signal. A comparison circuit generates a comparison result signal from the error signal. A drive signal generation circuit generates a constant level signal and a second pulse signal. An output circuit receives the first pulse signal and either the constant level signal or the second pulse signal to generate first and second drive signals for driving first and second transistors. The output circuit generates the second drive signal in accordance with the first pulse signal when receiving the constant level signal and generates the second drive signal with the first and second pulse signals when receiving the second pulse signal.
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Citations
17 Claims
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1. A DC-DC converter generating an output voltage from an input voltage, the DC-DC converter comprising:
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a first transistor receiving the input voltage; a second transistor coupled to the first transistor; a choke coil including a first terminal coupled to a connection node between the first and second transistors and a second terminal outputting the output voltage; an error amplification circuit comparing the output voltage and a first reference voltage to generate an error signal; a pulse signal generation circuit generating a first pulse signal that is in accordance with the error signal; a comparison circuit comparing the error signal and a second reference voltage to generate a comparison result signal, the comparison result signal being in either one of a first logic state and a second logic state; a drive signal generation circuit receiving the comparison result signal and generating either one of a constant level signal and a second pulse signal, with the drive signal generation circuit generating the constant level signal when receiving the comparison result signal in the first logic state and generating the second pulse signal when receiving the comparison result signal in the second logic state; and an output circuit receiving the first pulse signal and either one of the constant level signal and the second pulse signal and generating first and second drive signals respectively driving the first and second transistors, with the output circuit generating the second drive signal in accordance with the first pulse signal when receiving the constant level signal and generating the second drive signal with the first and second pulse signals when receiving the second pulse signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method controlling a DC-DC converter that generates an output voltage from an input voltage, the DC-DC converter including a first transistor receiving the input voltage, a second transistor coupled to the first transistor, and a choke coil coupled to a connection node between the first and second transistors, the method comprising:
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generating an error signal by comparing the output voltage and a first reference voltage; generating a first pulse signal in accordance with the error signal; generating a comparison result signal by comparing the error signal and a second reference voltage; generating a constant level signal when the comparison result signal is in a first logic state; generating a second pulse signal when the comparison result signal is in a second logic state; and receiving the first pulse signal and either one of the constant level signal and the second pulse signal; and generating first and second drive signals respectively driving the first and second transistors, wherein said generating first and second drive signals includes; generating the second drive signal in accordance with the first pulse signal when the comparison result signal is in the first logic state; and generating the second drive signal with the first and second pulse signals when the comparison result signal is in the second logic state. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification