Overview: Customer Specific Device from ON Semiconductor DAP008 Maximus PWM Current−Mode Controller for High−Power Universal Off−Line Supplies
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Extremely Low No−Load Standby Power Current−Mode with Skip−Cycle Capability Internal Temperature Shutdown Internal Leading Edge Blanking 500 mA Peak Current Capability Internally Fixed Frequency at 65 kHz Direct Optocoupler Connection SPICE Models Available for TRANsient and AC Analysis Pb−Free Package is Available Housed in an SO−8 package, the DAP008 represents a major leap toward ultra−pact Switch−Mode Power Supplies. Due to its novel concept, the circuit allows the implementation of plete off−line AC/DC adapters, battery charger or a high−power SMPS with few external ponents. Due to its high drive capability, Maximus is not afraid by 30 nC gate charge MOSFETs which, together with internal ramp pensation and built−in frequency jittering, ease the design of high power AC/DC adapters. With an internal structure operating at a fixed 65 kHz, the controller supplies itself from the high−voltage rail, avoiding the need of an auxiliary winding. This feature naturally eases the designer task in battery charger applications. Finally, current−mode control provides an excellent audio−susceptibility and inherent pulse−by−pulse control. When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so−called skip cycle mode and provides excellent efficiency at light loads. Because this occurs at a user adjustable low peak current, no acoustic noise takes place.
