Title:
DC/DC CONVERTER DRIVING CIRCUIT, AND LIGHT EMITTING DEVICE AND ELECTRONIC DEVICE USING SUCH DC/DC CONVERTER DRIVING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2006/137291
Kind Code:
A1
Abstract:
A driving circuit (100) controls on and off of a switching transistor (Tr1) of a DC/DC converter. A first resistor (R1) is provided on a path of a current flowing in a primary coil of a transformer (10) connected to the switching transistor (Tr1), and one end is grounded. A second resistor (R2) is provided on a path of a current flowing in a secondary coil of the transformer (10), and one end is grounded. A switching control section (30) turns off the switching transistor (Tr1) when a first detection voltage (Vx1) exceeds a first threshold voltage (Vth1), and turns on the switching transistor (Tr1) after a prescribed delay time (&tgr ) from a time when a second detection voltage (Vx2) exceeds a second threshold voltage.
Inventors:
TAMEGAI YOICHI (JP)
YAMAMOTO ISAO (JP)
YAMAMOTO ISAO (JP)
Application Number:
PCT/JP2006/311837
Publication Date:
December 28, 2006
Filing Date:
June 13, 2006
Export Citation:
Assignee:
ROHM CO LTD (JP)
TAMEGAI YOICHI (JP)
YAMAMOTO ISAO (JP)
TAMEGAI YOICHI (JP)
YAMAMOTO ISAO (JP)
International Classes:
G03B15/02; H02M3/28; G03B15/03; G03B15/05
Foreign References:
| JP2005130602A | 2005-05-19 | |||
| JP2003259641A | 2003-09-12 | |||
| JP2004364433A | 2004-12-24 | |||
| JP2002315335A | 2002-10-25 | |||
| JP2004071428A | 2004-03-04 | |||
| JP2005065498A | 2005-03-10 |
Attorney, Agent or Firm:
Morishita, Sakaki (Ebisu-Nishi Shibuya-k, Tokyo 21, JP)
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