Method and apparatus for efficient transitioning between...

Details Method and apparatus for efficient transitioning between... Method and apparatus for efficient transitioning between...

2007-10-09

2011-12-20

Laxton, Gary L. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S284000

Reexamination Certificate

active

08080987

ABSTRACT:
A modulator circuit for a switching regulator including first and second ramp generators, a comparator circuit and a reset circuit. The switching regulator provides a compensation voltage indicative of output voltage error. The ramp generators generate leading- and trailing-edge ramp voltages which are compared to the compensation voltage for determining pulses on a pulse modulation signal. The reset circuit prevents the leading-edge ramp voltage from resetting if the leading-edge ramp voltage has not reached the compensation voltage while ramping. The reset circuit further clamps the leading-edge ramp voltage until the pulse modulation signal is asserted again. In a multiphase configuration, each leading-edge ramp voltage is suspended if any leading-edge ramp voltage is clamped. An offset voltage may be added to the compensation, leading-edge, or trailing-edge voltages when a mode select signal indicates a reduced load condition. The offset voltage may be adjusted based on various operating conditions.

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patent: 2007/0018627 (2007-01-01), Chen
patent: 2007/0120547 (2007-05-01), Tateishi et al.
patent: WO 2007050256 (2007-05-01), None

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