Method of reducing a ripple of a heavy loading pulse...

Details Method of reducing a ripple of a heavy loading pulse... Method of reducing a ripple of a heavy loading pulse...

2006-07-04

2006-07-04

Nguyen, Matthew V. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S271000, C323S285000

Reexamination Certificate

active

07071665

ABSTRACT:
In a pulse frequency modulated (PFM) voltage regulator, a PFM switching signal is provided for converting a DC voltage source to an output voltage. The output voltage is detected. When the output voltage is lower than a predetermined target voltage, a duty cycle of the PFM switching signal is reduced. For example, a minimum OFF-time of the PFM switching signal may be prolonged or a constant ON-time of the PFM switching signal may be shortened. In other words, a period of delivering energy to a capacitor from an inductor may be prolonged or a period of storing energy in the inductor may be shortened. Therefore, a ripple of the output voltage is effectively reduced when the PFM voltage regulator is operated in a heavy loading condition.

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Maxim Integrated Products Data Sheet No. 19-0113 Rev. 2, Jan. 1995, pp. 1-8.

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