Adaptive constant on-time switching regulator
First Claim
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1. An adaptive constant on-time switching regulator, comprising:
- an input terminal operable to receive an input signal;
an output terminal operable to provide an output signal;
a switching circuit coupled to the input terminal;
an output circuit coupled between the switching circuit and the output terminal,wherein the output circuit comprises;
an inductor coupled between the switching circuit and the output terminal;
an output capacitor coupled between the output terminal and ground;
anda control circuit, coupled to the switching circuit, operable to control switches in the switching circuit to be turned on for an adaptive constant time, and be turned off for a minimum time, wherein the control circuit comprises;
an adaptive constant on-time control circuit, operable to receive a logical signal and a current sense signal representing the inductor current on the rising period part of the inductor current, the control circuit providing an adaptive constant on-time signal;
a feedback circuit, coupled to the output terminal, operable to receive the output signal and provide a feedback signal;
a minimum off-time control circuit, operable to receive the logical signal and provide a minimum off-time signal;
a logic circuit, coupled to the adaptive constant on-time control circuit, for receiving the adaptive constant on-time signal, the logic circuit coupled to the feedback circuit, for receiving the feedback signal, the logic circuit coupled to the minimum off-time control circuit, for receiving the minimum off-time signal, the logic circuit operable to provide the logical signal;
a reverse current compare circuit, operable to receive a signal representing the inductor current on the falling period part of the inductor current, and provide a reverse current indicating signal; and
a driver, coupled to the logic circuit, for receiving the logical signal;
the driver coupled to the reverse current compare circuit, for receiving the reverse current indicating signal;
the driver operable to provide a driving signal to the switching circuit to control the switches in the switching circuit to be turned on for an adaptive constant on time, and be turned off for a minimum off time.
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Abstract
The present invention provides an adaptive constant on-time switching regulator which comprises a switching circuit, a control circuit, and an output circuit. The control circuit controls the switches in the switching circuit to be turned on for an adaptive constant time, and be turned off for a minimum time.
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Citations
8 Claims
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1. An adaptive constant on-time switching regulator, comprising:
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an input terminal operable to receive an input signal; an output terminal operable to provide an output signal; a switching circuit coupled to the input terminal; an output circuit coupled between the switching circuit and the output terminal, wherein the output circuit comprises; an inductor coupled between the switching circuit and the output terminal; an output capacitor coupled between the output terminal and ground; and a control circuit, coupled to the switching circuit, operable to control switches in the switching circuit to be turned on for an adaptive constant time, and be turned off for a minimum time, wherein the control circuit comprises; an adaptive constant on-time control circuit, operable to receive a logical signal and a current sense signal representing the inductor current on the rising period part of the inductor current, the control circuit providing an adaptive constant on-time signal; a feedback circuit, coupled to the output terminal, operable to receive the output signal and provide a feedback signal; a minimum off-time control circuit, operable to receive the logical signal and provide a minimum off-time signal; a logic circuit, coupled to the adaptive constant on-time control circuit, for receiving the adaptive constant on-time signal, the logic circuit coupled to the feedback circuit, for receiving the feedback signal, the logic circuit coupled to the minimum off-time control circuit, for receiving the minimum off-time signal, the logic circuit operable to provide the logical signal; a reverse current compare circuit, operable to receive a signal representing the inductor current on the falling period part of the inductor current, and provide a reverse current indicating signal; and a driver, coupled to the logic circuit, for receiving the logical signal;
the driver coupled to the reverse current compare circuit, for receiving the reverse current indicating signal;
the driver operable to provide a driving signal to the switching circuit to control the switches in the switching circuit to be turned on for an adaptive constant on time, and be turned off for a minimum off time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification