Title:
VOLTAGE RISE/FALL TYPE SWITCHING REGULATOR
Document Type and Number:
Japanese Patent JP2008206366
Kind Code:
A
Abstract:
To provide a voltage rise/fall type switching regulator which securely prevents generation of a reverse current in each operational mode.
A reverse current detection circuit 9 compares a voltage difference between an output voltage Vout and a voltage BOLX with a reference voltage generated in the reverse current detection circuit 9. When the voltage difference becomes less than the reference voltage, a predetermined reverse current detected signal S1 is output to a control circuit 8. Then, when the predetermined reverse current detected signal S1 is input, the control circuit 8 turns off a synchronous rectifier transistor SW4 for voltage rising, keeps it in off state, and prevents the generation of the reverse current.
Inventors:
NISHIDA JUNJI
Application Number:
JP2007042373A
Publication Date:
September 04, 2008
Filing Date:
February 22, 2007
Export Citation:
Assignee:
RICOH KK
International Classes:
H02M3/155
Attorney, Agent or Firm:
Mitsuo Tanaka
Kyousei Tamura
Masahiro Ishino
Kyousei Tamura
Masahiro Ishino
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