Title:
ハイサイドバック・トランジスタを備えた回路装置
Document Type and Number:
Japanese Patent JP4971349
Kind Code:
B2
Abstract:
A cost-effective driver circuit for an LED background lighting unit includes a buck circuit with an upper transistor is driven via two further transistors. The first transistor is connected with its reference electrode to the positive terminal of a DC voltage source, with its working electrode to the control electrode of the buck transistor and with its control electrode, via a capacitor, to a signal contact, which can be driven externally. The second transistor is connected with its reference electrode to ground, with its working electrode to the control electrode of the buck transistor and with its control electrode to a signal contact, which can be driven externally. The buck transistor can be switched on via a corresponding gate signal at the terminal for the purpose of operating the light-emitting diodes. Advantageously, cost-effective standard transistors for operating voltages below 100 V can be used for the switching controller.
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Inventors:
Andreas Hoover
Peter Lowermeyer
Peter Lowermeyer
Application Number:
JP2008541735A
Publication Date:
July 11, 2012
Filing Date:
November 22, 2006
Export Citation:
Assignee:
OSRAM AG
International Classes:
H01L33/00; H05B44/00
Domestic Patent References:
| JP5136461A | ||||
| JP2002175048A | ||||
| JP2005032470A | ||||
| JP2004102278A | ||||
| JP1154575A |
Foreign References:
| US5126651 |
Attorney, Agent or Firm:
Toshio Yano
Takuya Kuno
Kimihiro Hoshi
Hiroyasu Ninomiya
Einzel Felix-Reinhard
Takuya Kuno
Kimihiro Hoshi
Hiroyasu Ninomiya
Einzel Felix-Reinhard