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Title:
TEMPERATURE PROTECTION CIRCUIT, POWER SUPPLY, AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/032489
Kind Code:
A1
Abstract:
A temperature protection circuit comprises means for comparing the temperature being monitored with each of threshold temperatures and judging that the temperature being monitored reaches a threshold temperature when the temperature being monitored is maintained at the threshold temperature or more for a predetermined confirmation period, means for setting a longer confirmation period as the threshold temperature compared with the temperature being monitored is lower, means for generating one of corresponding temperature protection signals (Sarm, Slmt, Stsd1, Stsd2) according to the judgment of which threshold temperature the temperature being monitored reaches. With this constitution, temperature protection operation can be performed with high accuracy and high safety without unnecessarily narrowing the range of the operating temperature of an IC to be protected.

Inventors:
IDE YUZO (JP)
AOKI YUICHI (JP)
FUJII MASAAKI (JP)
OKI HIROKAZU (JP)
Application Number:
JP2006/318405
Publication Date:
March 22, 2007
Filing Date:
September 15, 2006
Export Citation:
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Assignee:
ROHM CO LTD (JP)
IDE YUZO (JP)
AOKI YUICHI (JP)
FUJII MASAAKI (JP)
OKI HIROKAZU (JP)
International Classes:
H02H5/04; H01L23/58; H02M1/00
Foreign References:
JPH1093010A1998-04-10
JPH10117428A1998-05-06
JPS6412481U1989-01-23
Attorney, Agent or Firm:
SANO, Shizuo et al. (2-6 Tenmabashi-Kyomachi, Chuo-K, Osaka-Shi Osaka 32, JP)
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