Flyback Power Transformer ELECTRONICS INC. EPC3129-X • Used in SMPS Flyback Topology • Designed for use with Power Integration Chip • Reinforced Insulation (Triple Insulated Wire) • UL 94V-0 Recognized Components • UL 1446 Class F Insulation System • Very Low Core Loss Electrical Parameters @ 25° C PCA Part Number Chipset Voltage (Vdc) Primary OCL (µH ± 10%) @ 10 KHz, V out V out V out Sec. V out 0.1 Vrms 4 1 2 1 3 N 2.5 120-375 12 876 15 --3.3 0.9 120-375 5 1000 15 30 • Switching Frequency : 132 KHz • Isolation : 4500 Vrms • V in EPC3129-1 EPC3129-2 TOP244Y TOP243P Schematic Current (Amp.) Sec. 2 N 1.5 Sec. 3 .05 .05 Sec. 4 --.03 A B Dielectric Rating (Vrms) 1 sec. 4500 or 60 sec. 3750 1 sec. 1500 Between Pri. Wdg & Bias 1 sec. 4500 or 60 sec. 3750 Between Sec. Wdg’s to Core Pri. to all Sec. Wdg’s & Core • Note : “N” means Not Required/No Connections • Schematic A 1 Schematic B 10 V in Pri. Sec. 1 3 9 4 7 5 6 1 10 3 9 4 7 5 6 Sec. 4 Pri. Sec. 1 Sec. 3 (Fb/Bias) Sec. 3 (Fb/Bias) Sec. 2 Sec. 2 * Shield is optional Package 1.130 (28.80) .138 (3.50) PCA EPC3129-X D.C. 1.130 (28.80) .846 Max. (21.50) .787 (20.00) .787 Typ. (20.00) .028 Sq. (.700) Suggested Layout .051 (1.30) .197 (5.00) .197 (5.00) Unless Otherwise Specified Dimensions are in Inches /mm ± .010 /.25 PCA ELECTRONICS, INC. 16799 SCHOENBORN ST. NORTH HILLS, CA 91343 Product performance is limited to specified parameters. Data is subject to change without prior notice. CSC3129-X Rev. 1 4/9/03 FT TEL: (818) 892-0761 FAX: (818) 894-5791 http://www.pca.com