Texas Instruments' UCC28911 is a high-voltage flyback switcher that provides output voltage and current regulation without the use of an optical coupler. This device incorporates a 700 V power FET and a controller that processes operating information from the flyback auxiliary winding and power FET to provide a precise output voltage and current control. The integrated high-voltage current source for startup that is switched off during device operation and the controller current consumption are dynamically adjusted with load.

Control algorithms in the UCC28911, combining switching frequency and peak primary current modulation, allow operating efficiencies to meet or exceed applicable standards. Discontinuous conduction mode (DCM) with valley switching is used to reduce switching losses. Built-in protection features help to keep secondary and primary component stress levels in check across the operating range. The frequency jitter helps to reduce EMI filter cost.