Document 518 Flyback Transformer For ON Semiconductor NCP1027 The DA2077-AL flyback transformer has been specifically developed for use with ON Semiconductor’s NCP1027 Standby Power Supply for ATX Applications and is specified in Application Note AND8241/D. This transformer is designed for universal input, 85 – 265 Vac. It operates in continuous conduction mode within an input voltage range of 120 Vdc to 375 Vdc and at a 65 kHz switching frequency. Primary to secondary isolation is 2000 Vrms. Coilcraft can also custom engineer a transformer to meet your specific requirements. For free evaluation samples, contact Coilcraft or visit www.coilcraft.com. Inductance at 0 A1 ±10% (mH) Part number DA2077-AL 1. 2. 3. 4. 3.4 Leakage inductance2 max (µH) DCR max (Ohms) pri sec aux 2.53 0.042 0.574 114 Turns ratio pri : aux pri : sec 1 : 0.06 1 : 0.15 Output 5 V, 2 A (sec) 12.5 V, 10 mA (aux) Inductance is for the primary, measured at 10 kHz, 0.1 Vrms, 0 Adc Leakage inductance tested at 100 kHz, 0.1 Vrms Operating temperature range -40°C to +85°C. Electrical specifications at 25°C. 1.100 max 27,94 10 5 Primary Secondary 6 1 0.950 max 24,13 7 Auxiliary 9 0.620 15,75 0.150 ±0.030 3,81 ±0,76 6 5 0.150 3,81 Recommended Board Layout 1 0.200 (7 places) 5,08 1.100 max 27,94 1 0.0346 0,879 10 Bottom View 0.620 15,75 0.060 1,52 Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2008 Weight: 16.5 g Terminations: Matte tin over copper Packaged: 49 parts per tray Document 518 Revised 12/02/08