DC-DC converter
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMakoto Ishimaru, Takuya Ishii, Mikio Motomori, Takashi Ryu, Hirohisa Tanabe, Hiroki Akashi, Tomoya Shigemi
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Abstract
A current detector detects a current flowing through a high-side switch to output a current detection signal. When the current detection signal is lower than an error signal which is generated based on the difference between an output voltage and a reference voltage, a comparator outputs a signal. A timer outputs a signal a predetermined time after the high-side switch is turned ON. When the timer outputs the signal and the comparator outputs the signal, the high-side switch is turned OFF.
Claims9
A step-down DC-DC converter, comprising:
- an inductor;
- a smoother for smoothing a current flowing through the inductor to generate an output voltage of the DC-DC converter;
- a current detector for generating a current detection signal according to a magnitude of the current flowing through the inductor;
- an output error detector for generating an error signal according to a difference between the output voltage of the DC-DC converter and a supplied reference voltage;
- and
- a controller for controlling supply of a power to the inductor such that
- when the current detection signal sinks below the error signal, supply of the power to the inductor is started, and
- when a predetermined time elapses since the start of the supply of the power and the current detection signal exceeds the error signal, the supply of the power is stopped.
Dependencies are inferred from the claim text.