CONTROL CIRCUIT OF POWER SOURCE, ELECTRONIC APPARATUS, AND CONTROL METHOD OF POWER SOURCE

Title:

CONTROL CIRCUIT OF POWER SOURCE, ELECTRONIC APPARATUS, AND CONTROL METHOD OF POWER SOURCE

Document Type and Number:

Japanese Patent JP2012034519

Kind Code:

A

Abstract:

To provide a control circuit of a power source capable of enhancing the conversion efficiency.

A control circuit of a DC-DC converter is provided with a synchronous rectification period adjustment circuit 40. This synchronous rectification period adjustment circuit 40 includes: a comparator 41 which compares a node voltage VLX between a main side transistor and a synchronization side transistor with a first reference voltage Vr1; and one-shot circuits 47 and 48 which output control signals S8 and S9 in accordance with the comparison result with a comparator 42 which compares the voltage VLX with a second reference voltage Vr2. The synchronous rectification period adjustment circuit 40 includes a gm amplifier 49 which adjusts an OFF timing of the synchronization side transistor in response to the above-mentioned control signal S8 and S9.

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Inventors:

NIMURA KAZUYOSHI
MATSUMOTO TAKASHI
NAGAI RYUTA

Application Number:

JP2010172973A

Publication Date:

February 16, 2012

Filing Date:

July 30, 2010

Export Citation:

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Assignee:

FUJITSU SEMICONDUCTOR LTD

International Classes:

H02M3/155; H02M7/21

Domestic Patent References:

JP2009290986A	2009-12-10
JP2005086854A	2005-03-31

Attorney, Agent or Firm:

Hironobu Onda
Makoto Onda

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