Document 1257-1 SMT Planar Transformer For TI UCC2897 12 V/150 W Active Clamp Forward • Developed for Texas Instruments UCC2897 Active Clamp Forward (PMP9720 reference design) • Designed for 48 – 60 Vdc input; 12 V, 13 A • High efficiency; excellent DCR; very low leakage inductance; 1500 Vrms, one minute primary to secondary isolation. • Provides 0.009″ (0.229 mm) clearance above the seating plane Core material Ferrite Terminations Matte tin over nickel over brass. Weight 12.7 g Ambient temperature –40°C to +125°C Maximum part temperature +165°C (ambient + temp rise) Storage temperature Component: –40°C to +125°C. Tray packaging: –40°C to +80°C Resistance to soldering heat Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C / 85% relative humidity) Failures in Time (FIT) / Mean Time Between Failures (MTBF) 38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332 Packaging 36 per tray PCB washing Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. See Doc787_PCB_Washing.pdf. Primary Leakage Volt-time DCR max (mOhms) inductance1 inductance2 product typ4 PartTurns number N1 N2 Sec Aux ±20 (µH) max (µH) Pri3 Sec Aux (Vµsec) RA7040-AL 6 6 3 3 50 0.55 10.75 4.25 61.1 100 1. Inductance is for the primary, measured on Agilent/HP 4284A at 200 kHz, 0.5 Vrms, 0 Adc with primary windings connected in parallel. 2. Leakage Inductance is for the primary, measured at 200 kHz, 0.5 Vrms, 0 Adc with primary windings connected in parallel and all secondary pins shorted. 3. Primary DCR measured with primary windings connected in parallel 4. Volt-time product is based on primary windings connected in parallel. 5. Output of the secondary, 12 V 13 A, is from pins 11 – 8, Output of the aux winding is 12 V. 6. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. [email protected] subject to change without notice. US +1-847-639-6400 Please check [email protected] our website for latest information. UK +44-1236-730595 Taiwan +886-2-2264 3646 [email protected] China +86-21-6218 8074 [email protected] Singapore + 65-6484 8412 [email protected] Output5 12 V, 13 A 3 2 Pri N1 4 5 1 11 N2 10 Sec 9 Aux 8 6 Primary windings to be connected in parallel on the PC board. Document 1257-1 Revised 04/02/15 © Coilcraft Inc. 2016 This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check web site for latest information. Document 1257-2 RA7040-AL SMT Planar Transformer Dot indicates pin 1 Internal code 0.820 max 20,83 XXXXY 2 RA7040-ALL 1 3 4 5 6 11 10 9 8 0.920 max 23,37 0.009 min 0,229 0.375 max 9,53 0.004 /0,102 0.050 1,27 1 2 0.200 5,080 11 0.125 3,175 10 3 9 0.090 2,285 ∅ 0.080 2,03 CL 4 8 5 6 ∅ 0.390 9,91 0.080 2,03 0.800 20,32 0.110 2,79 Dimensions are in inches mm Recommended Land Pattern US +1-847-639-6400 [email protected] UK +44-1236-730595 [email protected] Taiwan +886-2-2264 3646 [email protected] China +86-21-6218 8074 [email protected] Singapore + 65-6484 8412 [email protected] Document 1257-2 Revised 04/02/15 © Coilcraft Inc. 2016 This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check web site for latest information.