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1. (WO2018119581) METHODS AND APPARATUS FOR NEGATIVE OUTPUT VOLTAGE ACTIVE CLAMPING USING FLOATING BANDGAP REFERENCE AND TEMPERATURE COMPENSATION



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INTERNATIONAL SEARCH REPORT (ISR)
Part 1:  1  2  3  4  5  6          Part 2:  A  B  C  D  E 
International application No. Applicant's or agent's file reference
PCT/CN2016/112125 Z16121454PCT
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
26 December 2016
Applicant
Texas Instruments Incorporated et al.
FOR FURTHER ACTION: See Form PCT/ISA/220 as well as, where applicable, item 5 below.
This international search report has been prepared by this International Searching Authority and is transmitted to the applicant according to Article 18. A copy is being transmitted to the International Bureau.
It is also accompanied by a copy of each prior art document cited in this report.
1. Basis of the report
a. With regard to the language, the international search was carried out on the basis of:
the international application in the language in which it was filed.
a translation of the international application into                                          which is the language of a translation furnished for the purposes of international search (Rules 12.3(a) and 23.1(b)).
b.
This international search report has been established taking into account the rectification of an obvious mistake authorized by or notified to this Authority under Rule 91 (Rule 43.6bis(a)).
c.
With regard to any nucleotide and/or amino acid sequence disclosed in the international application, the international search was carried out on the basis of a sequence listing filed or furnished:
2. Certain claims were found unsearchable
3. Unity of invention is lacking
4. Title of the invention
The text is approved as submitted by the applicant.
The text has been established by this Authority to read as follows:
METHODS AND APPARATUS FOR NEGATIVE OUTPUT VOLTAGE ACTIVE CLAMPING USING FLOATING BANDGAP REFERENCE AND TEMPERATURE COMPENSATION

5. Abstract
The text is approved as submitted by the applicant.
The text has been established, according to Rule 38.2, by this Authority as it appears in Box No. IV. The applicant may, within one month from the date of mailing of this international search report, submit comments to this Authority.

Methods, apparatus, systems and articles of manufacture for negative output voltage active clamping using a floating bandgap reference and temperature compensation are disclosed. An example load switch (1200) includes a floating bandgap reference circuit (1230) to generate a bandgap reference voltage (1231). A resistor divider (1250) is to generate a resistor divider voltage. A temperature compensator (1240) to apply a temperature compensation current (1241) to the resistor divider to create a temperature compensated resistor divider voltage. A power transistor (1265) is to be enabled when the temperature compensated resistor divider voltage is less than the bandgap reference voltage (1231). The example load switch (1200) can work under negative output voltage clamping and get better accuracy drain to source clamped voltage of power transistor (1265) for inductive load condition.


6. Drawings
a.
The figure of the drawings to be published with the abstract is Figure No.     12    
as suggested by the applicant.
as selected by this Authority, because the applicant failed to suggest a figure.
as selected by this Authority, because this figure better characterizes the invention.
b.
none of the figures is to be published with the abstract.

A. CLASSIFICATION OF SUBJECT MATTER

     G05F 1/567 (2006.01)i
According to International Patent Classification (IPC) or to both national classification and IPC

B. FIELDS SEARCHED

Minimum documentation searched (classification system followed by classification symbols):
     G05F; H02M
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched:
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
WPI, EPODOC, CNKI, CNPAT, IEEE, GOOGLE: switch, transistor, bandgap, reference, resistor, divider, temperature, compensate, breakdown

C. DOCUMENTS CONSIDERED TO BE RELEVANT

Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
(1)
A
CN 101330252 A (VASTVIEW TECHNOLOGY INC.) 24 December 2008 (2008-12-24)
1-14
description, pages 8-9 and figure 3
(2)
A
CN 104010424 A (UNIV. ELECTRONIC SCI. & TECHNOLOGY) 27 August 2014 (2014-08-27)
1-14
the whole document
(3)
A
CN 104375554 A (WUXI WST. MICROELECTRONICS CO., LTD.) 25 February 2015 (2015-02-25)
1-14
the whole document
(4)
A
CN 102290995 A (UNIV. XIDIAN) 21 December 2011 (2011-12-21)
1-14
the whole document
(5)
A
CN 101453270 A (WUXI JIANGNAN COMPUTING TECHNOLOGY INST.) 10 June 2009 (2009-06-10)
1-14
the whole document
(6)
A
US 2006007616 A1 (MICRON TECHNOLOGY, INC.) 12 January 2006 (2006-01-12)
1-14
the whole document
*
Special categories of cited documents:
"A"
document defining the general state of the art which is not considered to be of particular relevance
"E"
earlier application or patent but published on or after the international filing date
"L"
document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified)
"O"
document referring to an oral disclosure, use, exhibition or other means
"P"
document published prior to the international filing date but later than the priority date claimed
"T"
later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention
"X"
document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone
"Y"
document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the art
"&"
document member of the same patent family

D. INFORMATION ON PATENT FAMILY MEMBERS

Patent document cited in search report Publication date
(day/month/year)
Patent family member(s) Publication date
(day/month/year)
CN 101330252 A
24 December 2008
CN 101330252 B
09 June 2010
CN 104010424 A
27 August 2014
CN 104010424 B
27 April 2016
CN 104375554 A
25 February 2015
CN 104375554 B
25 November 2015
CN 102290995 A
21 December 2011
CN 102290995 B
25 September 2013
CN 101453270 A
10 June 2009
CN 101453270 B
24 April 2013
US 2006007616 A1
12 January 2006
WO 2006036255 A8
US 7148742 B2
JP 4784841 B2
EP 1766629 B1
KR 101157691 B1
JP 2008506196 A
WO 2006036255 A1
KR 20070046094 A
US 2007057716 A1
US 7332946 B2
EP 1766629 A2
SG 128877 A1
SG 128877 B
18 May 2006
12 December 2006
05 October 2011
15 April 2015
21 June 2012
28 February 2008
06 April 2006
02 May 2007
15 March 2007
19 February 2008
28 March 2007
26 February 2007
31 December 2007
Name and mailing address of the ISA/:
STATE INTELLECTUAL PROPERTY OFFICE OF THE P.R.CHINA
6, Xitucheng Rd., Jimen Bridge, Haidian District, Beijing 100088
China
Facsimile No. (86-10)62019451
Date of the actual completion of the international search:
21 September 2017
Date of mailing of the international search report:
28 September 2017
Authorized officer:
WANG,Xiaoxi
Telephone No. (86-10)61648441
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