TW200516366A - Pulse frequency modulated voltage regulator capable of prolonging minimum off-time - Google Patents
Pulse frequency modulated voltage regulator capable of prolonging minimum off-timeInfo
- 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
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- Dc-Dc Converters (AREA)
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.
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)
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 |
-
2003
- 2003-11-14 TW TW92131914A patent/TWI232360B/en not_active IP Right Cessation
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 |