NCP1083DEG Контроллеры PoE (Power over Ethernet) от ON Semiconductor

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Обзор

The NCP107x products integrate a fixed frequency current mode controller with a 700 V MOSFET. Available in a PDIP−7 or SOT−223 package, the NCP107x offer a high level of integration, including soft−start, frequency−jittering, short−circuit protection, skip−cycle, a maximum peak current set point, ramp compensation, and a Dynamic Self−Supply (eliminating the need for an auxiliary winding). Features • Built−in 700 V MOSFET with RDS(on) of 4.7 Ω(NCP1076/77) / 11 Ω(NCP1072/75) / 22 Ω(NCP1070/71) • Large Creepage Distance Between High−voltage Pins • Current−Mode Fixed Frequency Operation – 65 / 100 / 130 kHz • Peak Current: NCP1070/72 with 250 mA, NCP1071 with 350 mA, NCP1075 with 450 mA, NCP1076 with 650 mA and NCP1077 with 800 mA • Fixed Ramp Compensation • Skip−Cycle Operation at Low Peak Currents Only: No Acoustic Noise! • Dynamic Self−Supply: No Need for an Auxiliary Winding • Internal 1 ms Soft−Start • Auto−Recovery Output Short Circuit Protection with Timer−Based Detection • Auto−Recovery Overvoltage Protection with Auxiliary Winding Operation • Frequency Jittering for Better EMI Signature, Including Frequency Foldback Mode • No Load Input Consumption • Frequency Foldback to Improve Efficiency at Light Load • Internal Temperature Shutdown • These are Pb−Free DevicesTypical Applications • Auxiliary / Standby Isolated Power Supplies White Goods / Smart Meter / E−Meter