Constant on-time regulator with increased maximum duty cycle

Details Constant on-time regulator with increased maximum duty cycle Constant on-time regulator with increased maximum duty cycle

2007-12-12

2008-10-28

Sterrett, Jeffrey L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S288000

Reexamination Certificate

active

07443148

ABSTRACT:
A buck switching regulator receives an input voltage and provides a switching output voltage on a switch output node using a minimum on-time, variable off-time feedback control loop. The buck switching regulator includes an on-time control circuit for generating a first signal for turning off the high-side switch at the expiration of a first on-time duration or at the expiration of a maximum on-time. The first on-time duration is at least a minimum on-time and is allowed to expand to a maximum on-time when the feedback voltage remains less than a reference voltage. The maximum on-time includes a first maximum on-time and a second, extended maximum on-time. The second maximum on-time is applied when a minimum off-time was used for the high-side switch during the previous switching cycle. In another embodiment, the second maximum on-time is applied only when the switching regulator is not being current limited.

REFERENCES:
patent: 5747976 (1998-05-01), Wong et al.
patent: 6147478 (2000-11-01), Skelton et al.
patent: 6583610 (2003-06-01), Groom et al.
patent: 7202642 (2007-04-01), Chen et al.
patent: 2007/0222423 (2007-09-01), Chen et al.
patent: 2008/0030181 (2008-02-01), Liu et al.
patent: 2008/0061750 (2008-03-01), Stoichita
patent: 2008/0088284 (2008-04-01), Weng
patent: 2008/0088292 (2008-04-01), Stoichita et al.
“LM3100 Simple Switcher® Synchronous 1MHz 1.5A Step-Down Voltage Regulator,” National Semiconductor data sheet, Feb. 2006, pp. 1-15.
“LM5007 High Voltage (80V) Step Down Switching Regulator,” National Semiconductor data sheet, Dec. 2004, pp. 1-12.
Rais Miftakhutdinov, “Synchronous buck regulator design using the TI TPS5211 high-frequency hysteretic controller,” Texas Instruments Incorporated, Analog and Mixed-Signal Products, Nov. 1999, pp. 10-14.
“TPS5211 High Frequency Programmable Hysteretic Regulator Controller,” Texas Instruments data sheet, Sep. 1999, downloaded from www.datasheetcatalog.com, pp. 1-31.
“SC470 Synchronous Buck Controller for Dynamic Load-Voltage Applications,” Semtech data sheet, Sep. 27, 2005, www.semtech.com, pp. 1-31.
MAX1710/MAX1711/MAx1712 Data Sheet, “High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs,” Maxim Integrated Products data sheet, 2000, pp. 1-28.
“Analysis and Design of a Hysteretic Constant Frequency Buck Regulator Using the LM5007,” National Semiconductor Corporation Application Note 1319, May 2004, pp. 1-18.
Ioan Stoichita, “Ripple Generation In Buck Regulator Using Fixed On-Time Control To Enable The Use of Output Capacitor Having Any ESR,” U.S. Appl. No. 11/530,548, filed Sep. 11, 2006, 25 pages, parent application not yet published.

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