76250ENC, 76253/XXENC www.murata-ps.com EN Approved MAX250/251/253 Compatible Converter Transformers SELECTION GUIDE Output Max. Output Isolation Input Voltage Turns Voltage Current Voltage Order Code Ratio V V mA VDC 76250ENC - - - 6000 1CT:1 76253/35ENC 3.3 5.0 100 6000 1:5 76253/55ENC 5.0 5.0 200 6000 1:1.33 76250ENC CHARACTERISTICS FEATURES Parameter Conditions Min. Typ. Max. Units RoHS compliant Primary Inductance, L (1&5) 10kHz, 100mV 1.0 2.0 2.5 mH P 2 Leakage Inductance, L (1&5) 100kHz, 100mV 35 40 H Maxim MAX250/MAX251/MAX253 L Interwinding Capacitance, C (1&2) 100kHz, 100mV 1.5 3.0 pF compatible WW D.C. Resistance, R (1&5) <0.1VDC 1.0 2.0 DC BS EN 60950 approved Volt-time Product, E (1&5) 50 Vs T Isolation to 6kVDC 76253/35ENC CHARACTERISTICS Toroidal construction Parameter Conditions Min. Typ. Max. Units Industry-standard pinout Primary Inductance, L (1&5) 100kHz, 250mV 140 200 H P UL 94 V-0 package materials Secondary Inductance, L (2&6) 100kHz, 250mV 700 1000 H S 2 Leakage Inductance, L (1&5) 100kHz, 250mV 5.0 7.0 H Fully encapsulated L Interwinding Capacitance, C (1&2) 100kHz, 250mV 2.7 3.5 pF WW Compatible with RoHS soldering systems D.C. Resistance, R (1&5) <0.1VDC 0.4 0.8 DC Backward compatible with Volt-time Product, E (1&5) 25 35 Vs T Sn/Pb soldering systems 76253/55ENC CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units DESCRIPTION Primary Inductance, L (1&5) 100kHz, 250mV 80 150 H P The 76250ENC converter transformer is Secondary Inductance, L (2&6) 100kHz, 250mV 142 267 H S speci cally designed for use with Maxim 2 Leakage Inductance, L (1&5) 100kHz, 250mV 7.0 10.0 H L chipsets to provide isolated RS232 interfaces. A Interwinding Capacitance, C (1&2) 100kHz, 250mV 2.7 3.5 pF WW carefully controlled turns ratio ensures consistent D.C. Resistance, R (1&5) <0.1VDC 0.5 0.9 performance whilst a toroidal construction DC Volt-time Product, E (1&5) 30 40 Vs minimises EMI. T The 76253/XXENC converter transformers are ABSOLUTE MAXIMUM RATINGS speci cally designed for use with the MAX253 Operating free air temperature range 76250EN 0C to 70C chip set to provide isolated power supplies. The -40C to 85C 5V version can supply 1W and the 3.3V version Operating free air temperature range 76253/XXEN can supply 500mW. A centre tapped secondary -50C to 125C Storage temperature range winding allows for full bridge, half bridge or 300C Lead temperature 1.5mm from case for 10 seconds voltage doubling. 300mA Peak current, I 76250EN PK The devices are fully approved to BS EN 60950 for 400mA Peak current, I 76253/XXEN PK use in telecoms applications. Isolation voltage ( ash tested for 1 second) 6000VDC 3 SOLDERING INFORMATION Peak wave solder temperature 300C for 10 seconds Pin nish Matte tin All speci cations typical at T =25C A 1 Refer to mechanical dimensions for pin locations shown in brackets. 2 With pins 2 & 6 short circuited. 3 For further information, please visit www.murata-ps.com/rohs For full details go to www.murata-ps.com/rohs www.murata-ps.com/support KMP 7625XENC B04 Page 1 of 476250ENC, 76253/XXENC EN Approved MAX250/251/253 Compatible Converter Transformers TYPICAL CHARACTERISTICS (VOLTAGE CURVES) VOLTAGE CURVES 76253/35ENC 76253/55ENC 10 10 8 8 6 6 4 4 2 2 0 0 0 20 40 60 80 100 0 100 200 300 400 Output Current (mA) Output Current (mA) EFFICIENCY CURVES 76253/35ENC 76253/55ENC 100 100 80 80 60 60 40 40 20 20 0 0 0 20 40 60 80 100 0 100 200 300 400 Output Current (mA) Output Current (mA) VOLTAGE DEVIATION 76253/35ENC 76253/55ENC 110 110 105 105 100 100 95 95 90 90 -50 -25 0 25 50 75 100 -50 -25 0 25 50 75 100 Temperature (C) Temperature (C) All curves are derived from testing with the Maxim MAX235 IC using the circuit shown in application note MPAN-03 (download at