Abstract: A power control circuit includes: a lithium-ion capacitor (LIC) charged by power supplied by a power source; a first protection circuit supplying, to a first load operating using power supplied by the external power source, a first discharge current of the LIC when the power is no longer supplied from the power source; and a second protection circuit supplying, to a second load operating using the power, a second discharge current of the LIC when the power is no longer supplied. The second load operates at a lower power consumption than the first load. The first protection circuit stops supplying the first discharge current to the first load when a voltage of the LIC becomes less than a first voltage. The second protection circuit stops supplying the second discharge current to the second load when the voltage becomes less than a second voltage being lower than the first voltage.

Abstract: A clock synchronization signal generator generates a dead time in which gates of both of two switching elements included in a switching circuit are in an off state, and generates the dead time for controlling a plurality of pulses having different widths to pulses having a constant width, which is output by the switching circuit.

Abstract: A digital amplifier that minimizes and restricts an analog signal system and uses a feedback signal and a dither signal is achieved. A pulse width modulator that adjusts a pulse width of a digital signal, a switching circuit that amplifies an output signal from the pulse width modulator, and a feedback signal generation unit that generates a feedback signal based on an output signal from the switching circuit are included, the pulse width modulator adjusts the pulse width of the digital signal with reference to the feedback signal, and the feedback signal generation unit includes a first amplifier that outputs a first amplified signal in which a difference between the output signal from the switching circuit and one of a reference voltage and a dither signal is amplified and a second amplifier that amplifies a difference between the first amplified signal and the other of the dither signal and the reference voltage and outputs the amplified difference as the feedback signal.

Abstract: A power control circuit includes: a lithium-ion capacitor (LIC) charged by power supplied by a power source; a first protection circuit supplying, to a first load operating using power supplied by the external power source, a first discharge current of the LIC when the power is no longer supplied from the power source; and a second protection circuit supplying, to a second load operating using the power, a second discharge current of the LIC when the power is no longer supplied. The second load operates at a lower power consumption than the first load. The first protection circuit stops supplying the first discharge current to the first load when a voltage of the LIC becomes less than a first voltage. The second protection circuit stops supplying the second discharge current to the second load when the voltage becomes less than a second voltage being lower than the first voltage.

Abstract: A switching control circuit that controls on/off of a switching element is provided to efficiently disperse EMI noise due to high-speed switching, the switching control circuit includes a gate driver, a variable capacitance element connected to a gate of the switching element, and a capacitance changing circuit that randomly changes a capacitance of the variable capacitance element.

Abstract: A clock synchronization signal generator generates a dead time in which gates of both of two switching elements included in a switching circuit are in an off state, and generates the dead time for controlling a plurality of pulses having different widths to pulses having a constant width, which is output by the switching circuit.

Abstract: [Object] To efficiently disperse EMI noise due to high-speed switching. [Solution] A switching control circuit that controls on/off of a switching element comprises a gate driver, a variable capacitance element connected to a gate of the switching element, and a capacitance changing circuit that randomly changes a capacitance of the variable capacitance element.

Abstract: A digital amplifier includes a pulse-width adjustment circuit that adjusts the pulse width of a digital signal, a switching circuit that amplifies the output signal of the pulse-width adjustment circuit, and a feedback signal generator that generates a feedback signal based on the output signal of the switching circuit.

Abstract: A digital amplifier that minimizes and restricts an analog signal system and uses a feedback signal and a dither signal is achieved. A pulse width modulator that adjusts a pulse width of a digital signal, a switching circuit that amplifies an output signal from the pulse width modulator, and a feedback signal generation unit that generates a feedback signal based on an output signal from the switching circuit are included, the pulse width modulator adjusts the pulse width of the digital signal with reference to the feedback signal, and the feedback signal generation unit includes a first amplifier that outputs a first amplified signal in which a difference between the output signal from the switching circuit and one of a reference voltage and a dither signal is amplified and a second amplifier that amplifies a difference between the first amplified signal and the other of the dither signal and the reference voltage and outputs the amplified difference as the feedback signal.

Abstract: A digital amplifier includes a pulse-width adjustment circuit that adjusts the pulse width of a digital signal, a switching circuit that amplifies the output signal of the pulse-width adjustment circuit, and a feedback signal generator that generates a feedback signal based on the output signal of the switching circuit.