A method for pulse modulation control of switching regulators includes positioning
a series of parallel FET-type switches (high-side switches) between the input side
of an inductor and the voltage supply. A second parallel series of FET-type switches
(low-side switches) are used to connect the input side of the inductor to ground.
A control module enables one or more of the high-side switches at the start of
each switching cycle. The enabled high side switches remain enabled until the output
of the buck-type switching regulator is within regulation or a current limit through
the high-side switches has been exceeded. The control module then disables all
high-side switches and enables an equivalent number of low-side switches. The low-side
switches remain enabled until the output has fallen below regulation or current
has ceased to flow from the inductor to the load of the regulator.