DAP018A – PWM Current-Mode Controller

Part Number : DAP018A

Function : PWM Current-Mode Controller

Manufactures : ON Semiconductor

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DAP018A image

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Description :

Customer Specific Device from ON Semiconductor DAP018A/B/C/D/F PWM Current-Mode Controller for High-Power Universal Off-Line Supplies • Auto−recovery internal output short−circuit protection • • • • • • • • for A, B, C and D versions. F is latched Adjustable Timer for Improved Short−circuit Protection OTP and OVP Inputs for Improved Robustness +500 mA / −800 mA Peak Current Capability Up to 28 V VCC Operation Improved Creepage Distance between High−voltage and Adjacent Pin Extremely Low No−load Standby Power This is a Pb−Free Device This Device uses Halogen−Free Molding Compound Housed in a SO−14 package, the DAP018X represents an enhanced version of the currently available Speedking controller, the DAP011. With an internal structure operating at a fixed 65 kHz or 100 kHz frequency, the controller directly connects to the high−voltage rail for a lossless and clean startup sequence. Current−mode control also provides an excellent input audio−susceptibility and inherent pulse−by−pulse control. Internal ramp compensation easily prevents sub−harmonic oscillations from taking place in continuous conduction mode designs. On top of these features, the device takes advantage of the auxiliary winding negative swing to let the user adjust the maximum power the converter can deliver in high line conditions (OPP). When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically freezes the peak current and reduces its switching frequency down to 25 kHz. At this point, if further output power reduction occurs, the controller enters skip−cycle. The DAP018X features an efficient protective circuitry which, in presence of an overcurrent condition, disables the output pulses while the device enters a safe burst mode, trying to re−start. Once the fault has gone, the device auto−recovers. By implementing a timer to acknowledge a fault condition, independently from the auxiliary supply, the designer’s task is eased when stringent fault mode conditions need to be met. A dedicated input helps triggering a latch−off circuitry which permanently disables output pulses, for instance to implement an over voltage protection (OVP). A separate input accepts a direct NTC connection to ground for a simple and efficient over temperature protection (OTP). Features Typical Applications • High Power ac−dc Converters for TVs, Set−top Boxes etc. • Offline Adapters for Notebooks 14 1 x A WL Y WW G SOIC−14 D SUFFIX CASE 751A = Device Version = Assembly Location = Wafer Lot = Year = Work Week = Pb−Free Package 14 DAP018x AWLYWWG 1 MARKING DIAGRAM PIN CONNECTIONS OPP OVP CTimer Jittering Fold FB CS 1 2 3 4 5 6 7 14 13 12 11 10 9 8 HV NC OTP BO(B&D) VCC DRV GND • Fixed−frequency 65 kHz (A and B versions) or 100 kHz • • • • • • • (C and D versions) Current−mode Control Operation Internal and Adjustable Over Power Protection (OPP) Circuit Freque […]

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DAP018A Datasheet

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