US 2009/0015220 A1 · Switching power supply device, semiconductor intergrated circuit device and power supply device

Abstract

A switching power supply device performs a stable operation with fast response for a semiconductor integrated circuit device. A capacitor is provided between the output side of an inductor and a ground potential. A first power MOSFET supplies an electric current from an input voltage to the input side of the inductor. A second power MOSFET turned on when the first power MOSFET is off allows the input side of the inductor to be of a predetermined potential. A first feedback signal corresponding to an output voltage obtained from the output side of the inductor and a second feedback signal corresponding to an electric current flowed to the first power MOSFET are used to form a PWM signal. The first power MOSFET has plural cells of a vertical type MOS-construction.

Claims10

Dependent claims

-13. (canceled)

A power supply device comprising:

an oscillation circuit;
a first signal transmission path transmitting a periodic signal corresponding to an output signal of the oscillation circuit to a pulse generation circuit;
a second signal transmission path transmitting a periodic signal corresponding to an output signal of the oscillation circuit to a first external terminal;
a third signal transmission path transmitting a periodic signal inputted from the first external terminal to the pulse generation circuit;
a switching power supply circuit to which a PWM period is set by a timing signal formed by the pulse generation circuit;
and
a first mode transmitting the periodic signal corresponding to the output signal of the oscillation circuit via the first signal transmission path and the second signal transmission path by an operation control signal and a second mode transmitting the periodic signal inputted from the first external terminal via the third signal transmission path.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/216,733Filed 10 Jul 2008

Priority

JP 2005-3238328 Nov 2005

Published

15 Jan 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

H02M 3/156
Using semiconductor devices only: with automatic control of output voltage or current, e.g. switching regulators
H02M 1/0009
Details of control, feedback or regulation circuits: devices or circuits for detecting current in a converter
H03K 2217/0027
Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00: measuring means of, e.g.…
H02M
Apparatus for conversion between ac and ac, between ac and dc, or

Switching power supply device, semiconductor intergrated circuit device and power supply device

Life of this patent

Switching power supply device, semiconductor intergrated circuit device and power supply device

Life of this patent

Abstract

Claims10