Document 484-1 SMT Power Inductor For National Semiconductor LM5115 DC Controller IC The D1787-AL was developed for use with the National Semiconductor LM5115 Secondary Side Post Regulator Controller and LM5025 Primary Side Controller. This flat wire power inductor offers extremely low dc resistance and very high current ratings (up to 23 Arms). The flat core allows for exceptional heat dissipation and provides an excellent surface for pick and place operation. This inductor is ideal for power supply applications where high current handling is essential and is perfect for lowvoltage dc-dc converters. Custom inductance values are also possible. Request free evaluation samples by contacting Coilcraft or visiting www.coilcraft.com. DCR SRF Inductance1 max typ2 ±10% (µH) (mOhms) (MHz) 33.0 2.8 9.0 Isat3 Irms 4 (A) (A) 8.0 23.0 1. Inductance measured at 100 kHz, 0.1 Vrms, 0 Adc using Coilcraft SMD-D fixture in Agilent/HP 4284A impedance analyzer. 2. SRF measured using Agilent/HP 8753D network analyzer and Coilcraft SMD-D test fixture. 3. DC current at which the inductance drops 20% (typ) from its value without current. 4. Average current for a 40°C rise above 25°C ambient. 5. Operating temperature range -40°C to +85°C. 6. Electrical specifications at 25°C. See Qualification Standards section for environmental and test data. Temperature Rise vs Current 30 Temperature rise (from 25°C) Part number D1787-AL 25 20 15 10 5 0 0 5 10 15 20 25 Current (A rms) Specifications subject to change without notice. Please check our website for latest information. Document 484-1 © Coilcraft, Inc. 2006 Revised 11/09/06 Document 484-2 SMT Power Inductor - D1787-AL Typical L vs Frequency Typical L vs Current 1000 Inductance (µH) Inductance (µH) 1000 100 100 10 10 0.1 10 1 100 0.1 COILCRAFT D1787-AL CCI0525 100 Current (A) Recommended Land Pattern 1.10 max 27,9 1.100 max 27,94 10 1 Frequency (MHz) 0.77 max 19,6 CL 0.455 11,56 0.220 5,59 0.160 4,06 0.240 6,10 0.210 5,33 0.190 4,83 0.655 max 16,6 0.004/0,102 Terminations: Tin-silver over copper Weight: 34.9 g Packaging: 25 pieces per tray 0.150 3,8 0.270 6,9 Specifications subject to change without notice. Please check our website for latest information. Document 484-2 © Coilcraft, Inc. 2006 Revised 11/09/06