Overview: Customer Specific Device from ON Semiconductor DAP011/DAP011C PWM Current−Mode Controller for High−Power Universal Off−Line Supplies
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5.0 V – 5.0 mA Reference Voltage Internal Temperature Shutdown Direct Optocoupler Connection Extremely Low No−Load Standby Power Adjustable Soft−Start This is a Pb−Free Device* Housed in an SO−14 package, the DAP011/DAP011C represents an enhanced version of the Maximus, DAP008, controller. Due to its high drive capability, SpeedKing drives large gate−charge MOSFETs which, together with internal ramp pensation and a user selectable frequency jittering, ease the design of modern AC/DC adapters. With an internal structure operating at a fixed 65/100 kHz frequency, the controller directly connects to the high−voltage rail for a loss less and clean startup sequence. Current−mode control also provides an excellent input audio−susceptibility and inherent pulse−by−pulse control. Internal ramp pensation easily prevents subharmonic oscillations from taking place in continuous conduction mode designs. 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. Due to a proprietary SoftSkip technique, the absence of sharp transitions during skip mode significantly reduces acoustical noise.
