Rohm Co., Ltd.

Romm Co., Ltd.

Akihiro Kawano

Kazuki Hashimoto

Yuhei Yamaguchi

Isao Takobe

Shingo Hashiguchi

Hironori Sumitomo

Hiroaki Ando

Keita Itohara

Disclosed herein is a controller circuit of a series capacitor buck converter including input and output lines, a first switch, a coupled inductor including a first inductor and a second inductor, a second switch, a series capacitor, a third switch, a fourth switch, and an output capacitor. The controller circuit includes a control logic circuit that generates a plurality of control signals instructing ON-OFF states of the first to fourth switches so as to alternately repeat a first state in which the first switch and the fourth switch are ON and a second state in which the second switch and the third switch are ON, with an interval of dead time, and a first timing generator that generates a first timing signal as a trigger for turning on the first switch at a second dead time inserted into a period of transition from the second state to the first state.

Series capacitor buck converter and controller circuit and control method thereof

Provided is a controller circuit of a series capacitor step-down converter, the series capacitor step-down converter including an input line and an output line, a first switch, a coupled inductor, a second switch, a series capacitor, a third switch, a fourth switch, and an output capacitor, the controller circuit being configured to alternately switch between a first state in which the first switch and the fourth switch are on and a second state in which the second switch and the third switch are on while interposing a dead time between the first state and the second state, and turn on the second switch ahead of the third switch before a direction of a current of the first inductor is reversed in the dead time during a transition from the first state to the second state.

Series capacitor step-down converter, controller circuit thereof, and control method

Provided is a controller circuit for a series capacitor step-down converter that drives the series capacitor step-down converter at a switching frequency fhigher than a frequency frepresented by the following Equation wherein L is a design value for an inductance value of at least two inductors constituting a coupled inductor of the series capacitor step-down converter, M is a design value for a mutual inductance of the at least two inductors, and Cis a design value of a capacitance of a series capacitor.

Series capacitor step-down converter, and controller circuit and control method thereof

A controller IC for a resonant switched capacitor converter includes a drive circuit and a frequency controller. The frequency controller controls a switching frequency based on an output voltage of the resonant switched capacitor converter.

Controller circuit and control method for resonant switched capacitor converter

A main comparator compares a feedback voltage Vcorresponding to an output voltage Vof a DC/DC converter with a reference voltage Vand asserts a turn-on signal when the feedback voltage Vfalls below the reference voltage V. A timer circuit generates a turn-off signal Sthat transitions in level after an ON time Tproportional to (V−V/Vhas elapsed from assertion of the turn-on signal.

Control circuit for DC/DC converter

An inductor is connected between a switching node and an output line. The first switch and the second switch are connected in series between an input line and a ground line. A third switch is connected between the switching node and the input line. A flying capacitor is connected across the third switch and the first switch. A controller IC drives the first switch to the third switch.

Switching converter including controller circuit driving switches

Provided is a control circuit of a step-down converter, the control circuit including a bottom detecting circuit that asserts a turn-on signal when an output voltage of the step-down converter falls below a bottom level, an on-time generating circuit that includes a second timer circuit capable of measuring an on-time Tin such a manner that the assertion of the turn-on signal is a trigger for the measurement, and is configured to obtain a relation of T=α·V/Vwhen an input voltage of the step-down converter is defined as V, the output voltage is defined as V, and a controllable coefficient is defined as α, a control logic that sets a high-side transistor to an on-state during the on-time Tfrom the assertion of the turn-on signal and subsequently sets a low-side transistor to an on-state until the turn-on signal is asserted next, and an on-time correcting circuit that decreases the coefficient α when a switching period of the control logic is longer than a reference period, and increases the coefficient α when the switching period of the control logic is shorter than the reference period.

Control circuit of step-down converter, step-down converter, and electronic equipment

A switching power supply device includes first to fourth switches sequentially connected in series, an inductor, a first capacitor whose first end is connected to a connection node of the first switch and the second switch and whose second end is connected to a connection node of the third switch, the fourth switch, and the inductor, a second capacitor whose first end is connected to a connection node of the second switch and the third switch, and a controller that controls switching on and off of the first to fourth switches. In at least one of a first pair configured with the first switch and the third switch and a second pair configured with the second switch and the fourth switch, the controller shifts a timing of switching from off to on between two switches.

Switching power supply device

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.

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Kyoto, Japan

Akihiro Kawano