TW200744293A - DC-DC converters having improved current sensing and related methods - Google Patents

DC-DC converters having improved current sensing and related methods

Info

Publication number
TW200744293A
TW200744293A TW095136835A TW95136835A TW200744293A TW 200744293 A TW200744293 A TW 200744293A TW 095136835 A TW095136835 A TW 095136835A TW 95136835 A TW95136835 A TW 95136835A TW 200744293 A TW200744293 A TW 200744293A
Authority
TW
Taiwan
Prior art keywords
current
resistor
sense
output
coupled
Prior art date
Application number
TW095136835A
Other languages
Chinese (zh)
Other versions
TWI404316B (en
Inventor
Robert H Isham
Original Assignee
Intersil Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Intersil Inc filed Critical Intersil Inc
Publication of TW200744293A publication Critical patent/TW200744293A/en
Application granted granted Critical
Publication of TWI404316B publication Critical patent/TWI404316B/en

Links

Abstract

A DC-DC converter includes a chip including an error amplifier and a pulse width modulator (PWM) having an input connected to an output of the error amplifier, and an inductor driven by said PWM in series with an output node (VOUT) of the converter, wherein a load current flows through the inductor. VQUT is fed back through a network including a feedback resistor (RFB) to an inverting input of the error amplifier. A circuit for sensing the load current includes a first operational amplifier, a sense resistor on the chip having resistance RSENSE coupled to an inverting input of the first amplifier; wherein a sense current related to the load current flows through the sense resistor, a dependent current source provides an output current to supply the sense current. A reference resistor is disposed on the chip having a resistance RREFERENCE which is a fixed multiple of RSENSE. A set resistor is provided having a resistance RSET. Tracking circuitry sets a voltage across the reference resistor to be equal to a voltage across the set resistor. A function block is coupled to receive a current through the set resistor and a current through the reference resistor to find their ratio. A current multiplier is provided, wherein an output of the function block is coupled to the current multiplier. The current multiplier provides a measurement current which is proportional to the load current divided by RSET.
TW95136835A 2006-05-24 2006-10-04 Dc-dc converters having improved current sensing and related methods TWI404316B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US80819706P 2006-05-24 2006-05-24

Publications (2)

Publication Number Publication Date
TW200744293A true TW200744293A (en) 2007-12-01
TWI404316B TWI404316B (en) 2013-08-01

Family

ID=38906859

Family Applications (1)

Application Number Title Priority Date Filing Date
TW95136835A TWI404316B (en) 2006-05-24 2006-10-04 Dc-dc converters having improved current sensing and related methods

Country Status (2)

Country Link
CN (3) CN103986328A (en)
TW (1) TWI404316B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI394970B (en) * 2009-07-20 2013-05-01 Mediatek Inc Operating circuit and rc calibration method
US8779777B2 (en) 2010-06-04 2014-07-15 Linear Technology Corporation Dynamic compensation of aging drift in current sense resistor
TWI774491B (en) * 2021-07-28 2022-08-11 瑞昱半導體股份有限公司 Voltage regulator device

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TWI571049B (en) * 2012-03-12 2017-02-11 禾瑞亞科技股份有限公司 Signal sensing circuit
CN103294091B (en) * 2013-06-28 2014-10-15 电子科技大学 Voltage type feedback circuit suitable for DC-DC (Direct Current) converter
CN104467406A (en) * 2013-09-13 2015-03-25 杭州必易科技有限公司 Led constant current driver
US9748843B2 (en) * 2014-09-24 2017-08-29 Linear Technology Corporation DCR inductor current-sensing in four-switch buck-boost converters
TWI585421B (en) * 2015-05-22 2017-06-01 登騰電子股份有限公司 Current sensing module and power conversion apparatus and electronic apparatus using the same
US10024889B2 (en) * 2015-12-23 2018-07-17 Intel IP Corporation Apparatuses, methods, and systems for detection of a current level
CN108258900B (en) * 2016-12-28 2019-12-27 上海甄平半导体有限公司 DC-DC converter and power modulator
CN106771502A (en) * 2017-02-06 2017-05-31 山东鲁能智能技术有限公司 A kind of circuit and method for improving source current overload protection ability
CN109921639B (en) * 2019-03-18 2021-02-12 电子科技大学 Buck converter based on variable conduction time control
US10666197B1 (en) * 2019-06-03 2020-05-26 Realtek Semiconductor Corp. Low noise crystal oscillator and method thereof
US11175319B1 (en) * 2020-09-18 2021-11-16 Stmicroelectronics Asia Pacific Pte Ltd High accuracy low temperature drift high-side current sensing hardware and method

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SE515388C2 (en) * 1995-09-14 2001-07-23 Abb Research Ltd Device for sensing electrical discharges in a sample object
US5900714A (en) * 1996-11-08 1999-05-04 International Rectifier Corporation Circuit for sensing motor load current
US6040689A (en) * 1997-06-17 2000-03-21 Ssac, Inc. Current sensing method and apparatus
US5982160A (en) * 1998-12-24 1999-11-09 Harris Corporation DC-to-DC converter with inductor current sensing and related methods
TWI220022B (en) * 2002-05-27 2004-08-01 Richtek Technology Corp Current sensing apparatus and method
TW576007B (en) * 2002-09-20 2004-02-11 Richtek Technology Corp Semi-simulating current sensing apparatus and method for switching mode DC/DC power source converter
US7394630B2 (en) * 2002-10-11 2008-07-01 Ming-Dou Ker Electrostatic discharge protection device for mixed voltage interface
CN1717857A (en) * 2002-11-29 2006-01-04 索尼株式会社 Switching power supply circuit
TWI235541B (en) * 2004-06-25 2005-07-01 Anpec Electronics Corp Current detection circuit and method for use in DC-to-DC converter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI394970B (en) * 2009-07-20 2013-05-01 Mediatek Inc Operating circuit and rc calibration method
US8779777B2 (en) 2010-06-04 2014-07-15 Linear Technology Corporation Dynamic compensation of aging drift in current sense resistor
TWI463143B (en) * 2010-06-04 2014-12-01 Linear Techn Inc Dynamic compensation of aging drift in current sense resistor
TWI774491B (en) * 2021-07-28 2022-08-11 瑞昱半導體股份有限公司 Voltage regulator device

Also Published As

Publication number Publication date
CN102299627B (en) 2014-11-12
CN103986328A (en) 2014-08-13
CN101079575A (en) 2007-11-28
CN101079575B (en) 2012-08-29
CN102299627A (en) 2011-12-28
TWI404316B (en) 2013-08-01

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Legal Events

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MM4A Annulment or lapse of patent due to non-payment of fees