Switching regulator
First Claim
1. A switching regulator wherein an inputted DC current is turned ON/OFF so as to control an output voltage, comprising:
- a first switching element that turns the inputted DC current ON/OFF;
a driver that drives said the first switching element with a pulse width modulation signal; and
an inductor of variable inductance value, which is connected on an output side of said first switching element;
wherein, when the output voltage is to be altered, both a switching frequency of said first switching element and the variable inductance value of said inductor are changed.
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Accused Products
Abstract
In a switching regulator, an inductor L1 (in FIG. 1) and an output capacitor C1 are connected on the output side of a series circuit consisting of a switching element (MOS transistor P1) and a synchronous rectification element (MOS transistor N1), and an N-channel MOS transistor Q1 is connected between an intermediate point of the inductor L1 and one terminal thereof. In addition, the frequency of oscillator 2 and the turning ON/OFF of MOS transistor Q1 are controlled by control unit 1. When output voltage Vout is to be altered, the switching frequency of MOS transistors P1 and N1 is increased, and the inductance of inductor L1 is reduced, whereby a fast output change is permitted. On the other hand, during ordinary constant output voltage operation, the switching frequency is reduced, and the inductance value is increased, whereby high efficiency is attained.
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Citations
7 Claims
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1. A switching regulator wherein an inputted DC current is turned ON/OFF so as to control an output voltage, comprising:
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a first switching element that turns the inputted DC current ON/OFF; a driver that drives said the first switching element with a pulse width modulation signal; and an inductor of variable inductance value, which is connected on an output side of said first switching element; wherein, when the output voltage is to be altered, both a switching frequency of said first switching element and the variable inductance value of said inductor are changed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification