PWM controller with dual-edge modulation using dual ramps

Details PWM controller with dual-edge modulation using dual ramps PWM controller with dual-edge modulation using dual ramps

2005-12-23

2008-11-18

Mis, David (Department: 2817)

Electricity: power supply or regulation systems

Output level responsive

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

C323S282000, C332S109000

Reexamination Certificate

active

07453250

ABSTRACT:
A dual-edge modulation controller including first and second ramp circuits, first and second comparators, an error amplifier and pulse control logic. The first ramp circuit provides a leading-edge ramp synchronous with a clock. The error amplifier compares a feedback signal with a reference and provides a compensation signal. The first comparator compares the leading-edge ramp with the compensation signal and asserts a set signal. The second ramp circuit provides a trailing-edge ramp that begins ramping when the set signal is asserted. The second comparator compares the trailing-edge ramp with the compensation signal and asserts a reset signal. The pulse control logic asserts a PWM signal when the set signal is asserted and de-asserts the PWM signal when the reset signal is asserted. The controller may control multiple phases with current balancing. The slew rate of the ramps may be adjusted based on the number of PWM signal asserted.

REFERENCES:
patent: 6057675 (2000-05-01), Tateishi

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