772 SERIES Pulse Transformers features 600Vrms Working UL 94V-0 Package Material 2500/4000Vrms Isolation Inductance to 16mH Up to 480 V S ET PCB Mounting Custom Parts Available The 772 series of pulse transformers are intended for medium power applications in switch mode power supplies and thyristor/triac firing (eg motor control applications). The standard turns ratios may be modified by connecting several windings in series. pin connections 8 Pin DIP (top view) 1 3 Secondary 1 4 Primary 5 Secondary 2 2 6 4 - 772 SERIES description Pulse Transformers 4-17 772 SERIES Pulse Transformers absolute maximum ratings over operating free air temperature range Operating free air temperature range . . . . . . . . Storage temperature range . . . . . . . . . . . . . Lead Temperature 1.5mm from case for 10 seconds Isolation voltage (flash tested for 1 second) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C . --60°C to 125°C . . . . . . 300°C . . . . 2500Vrms electrical specifications over operating free air temperature range Turns Ratio 2% 77209 77208 77207 77206 77205 77204 77203 77202 Parameter 77201 Part Number Units 1:1 1:1:1 2:1:1 1:1 1:1:1 2:1:1 1:1 1:1:1 2:1:1 Primary Inductance (min.) 1.00 1.00 1.00 4.00 4.00 4.00 16.3 16.3 16.3 mH Primary ET Constant 120 120 120 240 240 240 482 482 482 V s Leakage Inductance (max.) 2.0 3.0 3.5 5.0 11 11 18 40 40 H Interwinding Capacitance (max.) 50 40 30 55 35 35 65 40 40 pF 0.25 0.25 0.24 0.86 0.90 0.84 3.50 3.60 3.50 0.23 0.22 0.12 0.83 0.76 0.38 3.40 3.10 1.60 ---- 0.28 0.15 ---- 1.10 0.50 ---- 4.20 2.00 DC Resistance (max.) Primary Winding DC Resistance (max.) Secondary 1 Winding DC Resistance (max.) Secondary 2 Winding Package Style Note : All data taken at T A = 25°C. 4-18 1 772 SERIES Pulse Transformers outline dimensions 8 Pin DIP package style 1 4 - 772 SERIES recommended footprint details All dimensions in mm XX.X 0.50, XX.XX 0.25 Pulse Transformers 4-19