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Title:
ELECTROSTATIC DISCHARGE PROTECTION CIRCUIT, OPERATION CONTROL METHOD FOR ELECTROSTATIC DISCHARGE PROTECTION CIRCUIT, SWITCHING REGULATOR USING ELECTROSTATIC DISCHARGE PROTECTION CIRCUIT, AND ELECTROSTATIC DISCHARGE PROTECTION METHOD FOR SWITCHING REGULATOR
Document Type and Number:
Japanese Patent JP2011045157
Kind Code:
A
Abstract:

To obtain an electrostatic protection circuit wherein a switching regulator can be normally operated, even if a switching transistor is provided with the electrostatic protection circuit, and to provide an operation control method for the electrostatic protection circuit, a switching regulator using the electrostatic protection circuit and an electrostatic protection method for the switching regulator.

The electrostatic protection circuit includes a clamp element M2, connected in parallel with a switching transistor M1 as a protected element, and an electrostatic detection circuit 3 that detects static electricity applied to the switching transistor M1. When the static electricity exceeds a predetermined value, the electrostatic detection circuit makes the clamp element M2 to turn on, to cause it to clamp the voltage applied to the switching transistor M1. The electrostatic detection circuit 3 stops the operation, according to an enable signal EN that is externally inputted to carry out enable control of the switching regulator 2, and thereby turns off the clamp element M2 to disconnect it.


Inventors:
NODA IPPEI
Application Number:
JP2009189865A
Publication Date:
March 03, 2011
Filing Date:
August 19, 2009
Export Citation:
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Assignee:
RICOH CO LTD
International Classes:
H02M3/155; H01L21/822; H01L21/8234; H01L27/04; H01L27/06; H01L27/088
Domestic Patent References:
JP2006311701A2006-11-09
JP2011507477A2011-03-03
JP3526853B22004-05-17
JP2008244071A2008-10-09
JP2008514183A2008-05-01
JP2007151322A2007-06-14
JP2008306788A2008-12-18
JP2008277719A2008-11-13
JP2006311701A2006-11-09
JP2011507477A2011-03-03
JP3526853B22004-05-17
Foreign References:
WO2009080777A22009-07-02
WO2009080777A22009-07-02
Attorney, Agent or Firm:
Mitsuo Tanaka
Kyousei Tamura
Masahiro Ishino



 
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