Although solutions can and have been found for all the
above issues, these difficulties have inspired a re-evaluation
of voltage-mode control in the light of today’s technology.
In particular, it seemed desirable to incorporate
some newer circuit concepts - such as voltage feed-forward,
programmable duty-cycle limiting, and sophisticated
fault protection - into a design which could also
benefit from low-current BiCMOS processing. These circuit
and process innovations have resulted in a new IC
controller equally at home in wide voltage range off-line
inverters and highly efficient isolated DC/DC converters.