TW200744293A - DC-DC converters having improved current sensing and related methods - Google Patents
DC-DC converters having improved current sensing and related methodsInfo
- 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
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.
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)
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 |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
2006
- 2006-10-04 TW TW95136835A patent/TWI404316B/en not_active IP Right Cessation
- 2006-10-23 CN CN201410240027.8A patent/CN103986328A/en active Pending
- 2006-10-23 CN CN2006101365840A patent/CN101079575B/en not_active Expired - Fee Related
- 2006-10-23 CN CN201110128753.7A patent/CN102299627B/en not_active Expired - Fee Related
Cited By (4)
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
Date | Code | Title | Description |
---|---|---|---|
MM4A | Annulment or lapse of patent due to non-payment of fees |