Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2006-03-28
2006-03-28
Sterrett, Jeffrey (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
07019504
ABSTRACT:
A constant ON-time controller for a buck converter utilizes dual symmetrical ramps. The ramps may be generated artificially or by sensing the voltage across a sense resistor in the output. The ramp may also be generated by sensing the voltage across the “ON” resistance of the low side FET in the switching regulator. A modified output voltage has one of the ramps superimposed and a modified reference voltage has the other ramps superimposed. The modified output voltage and the modified reference voltage are compared to determine when to start the ON-time of the buck converter. The dual ramps reduce, noise susceptibility. The ON-time is stopped in response to charging a capacitor with the regulator input voltage. An offset may also be generated representing the difference between the average output voltage and the reference voltage. The offset is used to generate a modified reference to compensate for the offset.
REFERENCES:
patent: 6057675 (2000-05-01), Tateishi
patent: 6246220 (2001-06-01), Isham et al.
patent: 6495995 (2002-12-01), Groom et al.
patent: 6583610 (2003-06-01), Groom et al.
patent: RE38487 (2004-04-01), Isham et al.
Groom Terry J.
Pullen Stuart
Arques Technology
Frankeny Richard F.
Winstead Sechrest & Minick P.C.
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