The LM5001, developed by National Semiconductor, is a high-voltage switch-mode regulator (see figure). It contains all of the functions necessary to implement efficient high-voltage boost, flyback, SEPIC, and forward converters, using few external components.
It integrates a 75-V N-channel MOSFET with a 1-A peak current limit. Current-mode control provides inherently simple loop compensation and line-voltage feed-forward for highly efficient rejection of input transients.