LM5021 Datasheet | National Semiconductor

May 2005 .. LM5021 AC-DC Current Mode PWM Controller LM5021 AC-DC Current Mode PWM Controller General Description The LM5021 off-line pulse width modulation (PWM) controller contains all of the Features needed to implement highly efficient off-line single-ended flyback and forward power converters using current-mode control. The LM5021 Features include an ultra-low (25 µA) start-up current, which minimizes power losses in the high voltage start-up network. A skip cycle mode reduces power consumption with light loads for energy conserving applications (ENERGY STAR ® , CECP, etc.). Additional Features include under-voltage lockout, cycle-by-cycle current limit, hiccup mode...