FINITE STATE MACHINE DIGITAL PULSE WIDTH MODULATOR FOR A DIGITALLY CONTROLLED POWER SUPPLY

摘要

A method is disclosed for generating pulse width modulated pulse control signals for controlling switches in a switching power supply. First, a count value is determined of a master clock (5618) within a switching cycle of the power supply from beginning to end thereof. A separate state machine (3704) is provided for each edge in each of pulse control signals and each is operated to generate the associated edge as a function of the sum (5612) of a fixed reference count value from the beginning of the switching cycle and a determined count value when the sum is determined (5620) to equal the actual count value.