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NCP1288 Datasheet(PDF) 1 Page - ON Semiconductor |
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NCP1288 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 39 page © Semiconductor Components Industries, LLC, 2011 July, 2011 − Rev. 3 1 Publication Order Number: NCP1288/D NCP1288 Fixed Frequency Current Mode Controller for Flyback Converters The NCP1288 is a new generation of the NCP12xx fixed−frequency current−mode controllers featuring a high−voltage startup current, pin−to−pincompatible with the previous generation. Due to its proprietary Soft−Skip ™ mode combined with frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. This Soft−Skip feature also dramatically reduces the risk of acoustic noise, which enables the use of inexpensive transformers and capacitors in the clamping network. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for converters where ruggedness and components cost are the key constraints. In addition, the controller includes a new high voltage circuitry that combines a startup current source and a brown−out / line OVP detector able to sense the input voltage either from the rectified ac line or the dc filtered bulk voltage. Finally, due to a careful design, the precision of critical parameters is well controlled over the entire temperature range (−40 °C to +125 °C), enabling easier design and increased safety (e.g. $5% for the peak current limit, $7% for the oscillator). Features • Timer−Based Overload Protections with Auto− Recovery (Option B) or Latched (Option A) Operation • High−Voltage Current Source with Built−in Brown−out and Line Overvoltage Protections • Fixed−Frequency Current−Mode Operation with Built−in Ramp Compensation • Frequency Jittering for a Reduced EMI Signature • Adjustable Overpower Compensation • Latch−off Input for Severe Fault Conditions, with Direct Connection of an NTC for Overtemperature Protection (OTP) • Protection Against Winding Short−Circuit • Frequency Foldback transitioning into Soft−Skip for Improved Performance in Standby • 65 kHz Oscillator (100 kHz and 133 kHz Versions Available Upon Request) • VCC Operation up to 28 V • Increased Precision on Critical Parameters • ±1.0 A Peak Drive Capability • 4.0 ms Soft−Start • Internal Thermal Shutdown with Hysteresis • These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant* Typical Applications • ac−dc Adapters for Notebooks, LCD, and Printers • Offline Battery Chargers • Consumer Electronic Power Supplies • Auxiliary/Housekeeping Power Supplies *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. SOIC−7 CASE 751U MARKING DIAGRAM http://onsemi.com 88Xff ALYWX G 1 8 88Xff = Specific Device Code X = A or B ff = 65, 00, or 33 A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb−Free Package See detailed ordering and shipping information in the package dimensions section on page 38 of this data sheet. ORDERING INFORMATION |
Similar Part No. - NCP1288_11 |
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Similar Description - NCP1288_11 |
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