Rohm Co., Ltd.

Hironori Sumitomo

Isao Takobe

Shingo Hashiguchi

Akihiro Kawano

Takeshi Nagata

Keita Itohara

A switch control circuit configured to control a first switch having a first terminal to which a first voltage is applied, and a second switch having a first terminal connected to a second terminal of the first switch and a second terminal to which a second voltage lower than the first voltage is applied. The switch control circuit includes: a first sampling/holding circuit configured to sample and hold a switch voltage generated at a connection node between the first switch and the second switch when the second switch is turned off; a first comparison circuit configured to compare the switch voltage sampled and held by the first sampling/holding circuit with a first constant voltage; and a first dead time adjustor configured to adjust a dead time when the switch voltage rises according to an output of the first comparison circuit.

Switch control circuit, voltage output device, and vehicle

A linear power supply circuit includes: an error amplifier configured to output an error signal according to a difference between a feedback voltage based on an output voltage and a reference voltage; a first transistor configured to be controlled by the error signal; a current mirror circuit; a bias current source configured to distribute and supply a bias current to the first transistor and the current mirror circuit; a current amplifier configured to amplify a current outputted from the current mirror circuit; and a compensator configured to compensate for the bias current by a current corresponding to the current outputted from the current amplifier.

Linear power supply circuit including a current amplifier to amplify output current and vehicle including the same

The switching power supply device includes first and second switches connected in series between an application end of an input voltage and an application end of a low voltage lower than the input voltage, and third and fourth switches connected in series between an application end of the input voltage and an application end of the low voltage, and a control unit configured to control the on/off state of each of the first to fourth switches. The first to fourth switches are configured such that an inductor is provided between a first connection node connecting the first switch and the second switch and a second connection node connecting the third switch and the fourth switch.

Switching power supply device

A linear power supply circuit includes: an output stage including a first output transistor and a second output transistor, which are provided between an input terminal to which an input voltage is able to be applied and an output terminal to which an output voltage is able to be applied and are connected in parallel to each other; a driver configured to drive the first output transistor and the second output transistor based on a difference between a voltage based on the output voltage and a reference voltage; a resistor inserted between a gate of the first output transistor and a gate of the second output transistor; a capacitor having one end connected to the input terminal and the other end connected to a connection node between the resistor and the gate of the second output transistor; and a clamp element connected in parallel to the resistor.

Linear power supply circuit with phase compensation circuit

A power supply device disclosed in the present specification has an output portion which generates an output voltage from an input voltage by means of on-off control of an output transistor and feeds the output voltage to a load, an output feedback controller which drives the output portion by performing output feedback control, and a detector which detects, by means of an electromagnetic induction method, a ripple component in a monitoring target current resulting from the on-off control of the output transistor. The output feedback controller performs the output feedback control based on the result of detection by the detector.

Power supply device including an electro-conductive cable wound around an inductor or output capacitor

A power supply device has an output portion that generates an output voltage from an input voltage and supplies the output voltage to a load, an output feedback controller that drives the output portion by performing output feedback control, and a first detector that detects, by means of an electromagnetic induction method, a change in a first monitoring target current due to a load change. The output feedback controller reflects a detection result from the first detector into the output feedback control.

Power supply device including an electro-conductive cable wound around an output capacitor

A switching regulator has an output stage which, with an output switch element, an inductor, a rectifying element, and a smoothing element, generates an output voltage from an input voltage, a divided voltage generator which generates a divided voltage from a switch voltage generated at one terminal of the rectifying element, a selector which outputs one of the divided voltage and a fixed voltage in accordance with a switching signal as a select voltage, a zero-cross comparator which monitors the select voltage to generate a zero-cross detection signal, and a controller which generates the switching signal in accordance with the necessity of monitoring the zero-cross of an inductor current and which performs on/off control of the output switch element reflecting the zero-cross detection signal.

Switching regulator, motor drive device, magnetic disk storage device, and electronic apparatus

A switching power supply apparatus includes: an output transistor to generate an output voltage from an input voltage based on an ON/OFF control of the output transistor; a reference voltage generating unit to generate a reference voltage; a ripple injection unit to inject a ripple component into the reference voltage to generate a ripple reference voltage; a comparator to compare a feedback voltage with the ripple reference voltage to generate a comparison signal; and a switching controller to perform the ON/OFF control of the output transistor based on the comparison signal.

Switching power supply apparatus

A level shift circuit includes an input port to which an input signal is input, a first signal amplifying unit configured to amplify the input signal input to the input port, a node at the first signal amplifying unit to output the amplified signal, a level shift input port to which a level shift voltage for controlling a DC level of the node is input, a first supply voltage configured to drive the first signal amplifying unit, and a level shift voltage generation circuit configured to generate the first supply voltage and the level shift voltage.

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Kyoto, Japan

Hironori Sumitomo