Driver circuit and switching regulator
AssigneeRohm Co., Ltd.
InventorsShun Fukushima, Kazuhiro Murakami
Life of this patent
Estimating the term…
Abstract
A driver circuit (DRV1) includes a pull-up circuit (PU1) and a pull-down circuit (PD1) that share an output node (external terminal (T3)). A signal (DI1 (DI2)) input to the pull-up circuit (PU1) and a signal (DI3) input to the pull-down circuit (PD1) are selected in a complementary manner, and the output node outputs an output signal in which rising time and falling time of the signals (DI1 (DI2) and DI3) are adjusted in accordance with on-off operation of the signals. The rising time is adjusted by transistors (M1 and M2) and a resistor (R1), while the falling time is adjusted by transistors (M3, M4 and M5) and a resistor (R2).
Claims18
A driver circuit comprising a pull-up circuit and a pull-down circuit, arranged to share an output node so as to output an output signal from the output node by on-off operation of complementary input signals, wherein
- the pull-up circuit and the pull-down circuit are connected in series between a power supply terminal and a reference potential via the output node, and
- at least one of the pull-up circuit and the pull-down circuit responses to each of rising and falling of the input signals with a first response and a second response, wherein time necessary for the second response is set to be longer than time necessary for the first response.
A driver circuit comprising a pull-up circuit and a pull-down circuit, arranged to share an output node so as to output an output signal from the output node by on-off operation of complementary input signals, wherein
- the pull-up circuit and the pull-down circuit are connected in series between a power supply terminal and a reference potential via the output node, and
- at least one of the pull-up circuit and the pull-down circuit responses to each of rising and falling of the input signals with a first response and a second response, wherein a dead time is set in which both the pull-up circuit and the pull-down circuit are turned off when operations of the two circuits are switched.
A switching regulator comprising:
- a switching transistor;
- an inductor to which current is supplied when the switching transistor is on-off controlled;
- a capacitor arranged to smooth electromagnetic energy stored in the inductor;
- and
- a driver circuit arranged to perform the on-off control of the switching transistor, wherein
- the driver circuit comprises a pull-up circuit and a pull-down circuit, arranged to share an output node so as to output an output signal from the output node by on-off operation of complementary input signals, wherein
- the pull-up circuit and the pull-down circuit are connected in series between a power supply terminal and a reference potential via the output node, and
- at least one of the pull-up circuit and the pull-down circuit responses to each of rising and falling of the input signals with a first response and a second response.
Dependencies are inferred from the claim text.