TW200516366A - Pulse frequency modulated voltage regulator capable of prolonging minimum off-time - Google Patents

Pulse frequency modulated voltage regulator capable of prolonging minimum off-time

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Publication number
TW200516366A
TW200516366A TW092131914A TW92131914A TW200516366A TW 200516366 A TW200516366 A TW 200516366A TW 092131914 A TW092131914 A TW 092131914A TW 92131914 A TW92131914 A TW 92131914A TW 200516366 A TW200516366 A TW 200516366A
Authority
TW
Taiwan
Prior art keywords
time
minimum
pfm
prolonging
voltage regulator
Prior art date
Application number
TW092131914A
Other languages
Chinese (zh)
Other versions
TWI232360B (en
Inventor
Guang-Nan Tzeng
Yung-Chih Chen
Rong-Chin Lee
Original Assignee
Aimtron Technology Corp
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 Aimtron Technology Corp filed Critical Aimtron Technology Corp
Priority to TW92131914A priority Critical patent/TWI232360B/en
Application granted granted Critical
Publication of TWI232360B publication Critical patent/TWI232360B/en
Publication of TW200516366A publication Critical patent/TW200516366A/en

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Abstract

In a pulse frequency modulated (PFM) voltage regulator, a PFM switching controller is provided to generate a PFM switching signal for converting a DC voltage source to an output voltage. A minimum OFF-time controller provides the PFM switching signal with a minimum OFF-time. In response to the output voltage, a feedback circuit generates a feedback signal. When the output voltage is lower than a predetermined target voltage, an OFF-time prolonging circuit prolongs the minimum OFF-time in response to the feedback signal. In other words, a time of delivering energy to a capacitor from an inductor may be prolonged by the OFF-time prolonging circuit. Therefore, a ripple of the output voltage is effectively reduced when the PFM voltage regulator is operated in a heavy loading condition.
TW92131914A 2003-11-14 2003-11-14 Pulse frequency modulated voltage regulator capable of prolonging minimum off-time TWI232360B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW92131914A TWI232360B (en) 2003-11-14 2003-11-14 Pulse frequency modulated voltage regulator capable of prolonging minimum off-time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW92131914A TWI232360B (en) 2003-11-14 2003-11-14 Pulse frequency modulated voltage regulator capable of prolonging minimum off-time

Publications (2)

Publication Number Publication Date
TWI232360B TWI232360B (en) 2005-05-11
TW200516366A true TW200516366A (en) 2005-05-16

Family

ID=36320009

Family Applications (1)

Application Number Title Priority Date Filing Date
TW92131914A TWI232360B (en) 2003-11-14 2003-11-14 Pulse frequency modulated voltage regulator capable of prolonging minimum off-time

Country Status (1)

Country Link
TW (1) TWI232360B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100410827C (en) * 2005-05-23 2008-08-13 圆创科技股份有限公司 PFM control circuit for high efficient changing voltage in broad loading demand
CN102868297B (en) * 2012-09-20 2014-09-10 电子科技大学 Deadline-fixed PFM (pulse frequency modulation) mode switching power supply controller

Also Published As

Publication number Publication date
TWI232360B (en) 2005-05-11

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Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees