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76250ENC, 76253/XXENC EN Approved MAX250/251/253 Compatible Converter Transformers SELECTION GUIDE Order Code 76250ENC 76253/35ENC 76253/55ENC Input Voltage V 3.3 5.0 Output Voltage V 5.0 5.0 Max. Output Current mA 100 200 Isolation Voltage VDC 6000 6000 6000 Turns Ratio 1CT:1 1:5 1:1.33 FEATURES RoHS compliant Maxim MAX250/MAX251/MAX253 compatible BS EN 60950 approved Isolation to 6kVDC Toroidal construction Industry-standard pinout UL 94 V-0 package materials Fully encapsulated Compatible with RoHS soldering systems Backward compatible with Sn/Pb soldering systems 76250ENC CHARACTERISTICS Parameter Primary Inductance, LP (1&5) Leakage Inductance, LL (1&5) D.C. Resistance, RDC (1&5) Volt-time Product, ET (1&5) 2 Conditions 10kHz, 100mV 100kHz, 100mV 100kHz, 100mV <0.1VDC Min. 1.0 Typ. 2.0 35 1.5 1.0 Max. 2.5 40 3.0 2.0 Units mH H pF Interwinding Capacitance, CWW (1&2) Vs 50 76253/35ENC CHARACTERISTICS Parameter Primary Inductance, LP (1&5) Secondary Inductance, LS (2&6) Leakage Inductance, LL (1&5)2 Interwinding Capacitance, CWW (1&2) D.C. Resistance, RDC (1&5) Volt-time Product, ET (1&5) Conditions 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV <0.1VDC Min. 140 700 Typ. 200 Max. 1000 Units H H H pF 5.0 2.7 0.4 25 35 7.0 3.5 0.8 Vs 76253/55ENC CHARACTERISTICS DESCRIPTION The 76250ENC converter transformer is specifically designed for use with Maxim chipsets to provide isolated RS232 interfaces. A carefully controlled turns ratio ensures consistent performance whilst a toroidal construction minimises EMI. The 76253/XXENC converter transformers are specifically designed for use with the MAX253 chip set to provide isolated power supplies. The 5V version can supply 1W and the 3.3V version can supply 500mW. A centre tapped secondary winding allows for full bridge, half bridge or voltage doubling. The devices are fully approved to BS EN 60950 for use in telecoms applications. Parameter Primary Inductance, LP (1&5) Secondary Inductance, LS (2&6) Leakage Inductance, LL (1&5)2 Interwinding Capacitance, CWW (1&2) D.C. Resistance, RDC (1&5) Volt-time Product, ET (1&5) Conditions 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV <0.1VDC Min. 80 142 Typ. Max. 150 267 Units H H H pF 7.0 2.7 0.5 30 40 10.0 3.5 0.9 Vs ABSOLUTE MAXIMUM RATINGS Operating free air temperature range 76250EN Operating free air temperature range 76253/XXEN Storage temperature range Lead temperature 1.5mm from case for 10 seconds Peak current, IPK 76250EN Peak current, IPK 76253/XXEN Isolation voltage (flash tested for 1 second) 0C to 70C -40C to 85C -50C to 125C 300C 300mA 400mA 6000VDC SOLDERING INFORMATION3 Peak wave solder temperature Pin finish All specifications typical at TA=25C 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 300C for 10 seconds Matte tin For full details go to www.murata-ps.com/rohs www.murata-ps.com Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 KMP_7625XENC_B03 Page 1 of 4 76250ENC, 76253/XXENC EN Approved MAX250/251/253 Compatible Converter Transformers TYPICAL CHARACTERISTICS (VOLTAGE CURVES) VOLTAGE CURVES 10 8 6 4 2 0 Output Voltage (V) Output Voltage (V) 76253/35ENC 10 8 6 4 2 0 76253/55ENC 0 20 40 60 80 100 0 Output Current (mA) 100 200 300 Output Current (mA) 400 EFFICIENCY CURVES 100 80 60 40 20 0 76253/35ENC 100 80 60 40 20 0 76253/55ENC Efficiency (%) 0 20 40 60 80 100 Efficiency (%) 0 100 200 300 400 Output Current (mA) Output Current (mA) VOLTAGE DEVIATION 110 76253/35ENC 110 76253/55ENC Voltage deviation from nominal 25C output (%) Voltage deviation from nominal 25C output (%) -50 -25 0 25 50 75 100 105 105 100 100 95 95 90 90 -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 http://www.murata-ps.com/data/apnotes/mpan-03.pdf). www.murata-ps.com Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 KMP_7625XENC_B03 Page 2 of 4 76250ENC, 76253/XXENC EN Approved MAX250/251/253 Compatible Converter Transformers PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS 15.00 (0.59) 1 15.00 (0.59) 2 12.50 (0.492) 12.00 (0.472) 2.54 (0.1) 3 5 76250ENC XYYWW 4* 6 4.10 (0.161) O0.560.05 (O0.0220.002) 7.50 (0.295) 10.16 (0.4) 2.42 (0.095) Pin Connections 76250EN (Top View) Pin Connections 76253/XXEN (Top View) 1 Primary Secondary 2 1 Primary Secondary 2 3 3 4 * 76250EN Pin not fitted. Unless otherwise stated all dimensions in mm (inches) 0.25mm (0.01). All pins on a 2.54mm (0.1") pitch and within 0.25mm (0.01") of true position. 5 6 5 6 TUBE DIMENSIONS RECOMMENDED FOOTPRINT DETAILS 2.54 (0.100) 2.54 (0.100) x6 HOLES* O1.00+0.15-0.00 (O0.039+0.006-0.000) Tube length: 4802.00mm (18.900.079"). Tube quantity: 30 Tube material: Antistatic coated clear pvc. Unless otherwise stated all dimensions in mm (inches) -0.00 +0.50 (-0.00 +0.020). Holes may be omitted for variants with fewer than 6 pins. Unless otherwise stated all dimensions in mm (inches) 0.25 (0.01). All pins on a 2.54 (0.1) pitch and within 0.25 (0.01) of true position. www.murata-ps.com Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 KMP_7625XENC_B03 Page 3 of 4 76250ENC, 76253/XXENC EN Approved MAX250/251/253 Compatible Converter Transformers TECHNICAL NOTES ISOLATION VOLTAGE `Hi Pot Test', `Flash Tested', `Withstand Voltage', `Proof Voltage', `Dielectric Withstand Voltage' & `Isolation Test Voltage' are all terms that relate to the same thing, a test voltage, applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. All products in this series are 100% production tested at their stated isolation voltage. This series is recognised by the British Standards Institution to a working voltage of 300Vrms for Reinforced Insulation systems. REPEATED HIGH-VOLTAGE ISOLATION TESTING It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environment. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from the specified test voltage. USA: Canada: UK: Mansfield (MA), Tel: (508) 339 3000, email: sales@murata-ps.com Toronto, Tel: (866) 740 1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com ISO 9001 REGISTERED Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. (c) 2008 Murata Power Solutions, Inc. France: Japan: China: Germany: Munchen, Tel: +49 (0)89-544334-0, email: ped.munich@murata-ps.com Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com www.murata-ps.com Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 KMP_7625XENC_B03 Page 4 of 4 |
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