76253

76250EN, 76253/XXEN EN Approved Converter Transformers SELECTION GUIDE Input Voltage Output Voltage Output Current Isolation Voltage Turns Ratio Order Code 76250EN 76253/35EN 76253/55EN (V) – 3.3 5.0 (V) – 5.0 5.0 (mA Max) – 100 200 (VDC) 6000 6000 6000 1CT:1 1:√5 1:1.33 76250EN CHARACTERISTICS Parameter Conditions MIN TYP MAX Units FEATURES s Maxim Compatible s BS EN 60950 Approved s Isolation to 6kV s Toroidal Construction s Industry Standard Pinout s UL 94V-0 Package Material s Fully Encapsulated DESCRIPTION The 76250EN 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/XXEN converter transformers are specifically designed for use with the MAX253 chipset 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 bride or voltage doubling. The devices are fully approved to BS EN 60950 for use in telecoms applications. Primary Inductance, L P Leakage Inductance, L L Interwinding Capacitance, C WW D.C. Resistance, R DC Volt-time Product, E T 10kHz, 100mV 100kHz, 100mV 100kHz, 100mV 0.1VDC 5kHz, 5V 53 350 92 460 1.5 1.80 0.60 120 600 3.6 3.00 1.00 µH µH µH pF Ω Vµs 20 35 76253/55EN CHARACTERISTICS Parameter Conditions MIN TYP MAX Units Primary Inductance, L P Secondary Inductance, L S Leakage Inductance, L L Interwinding Capacitance, C WW D.C. Resistance, R DC Volt-time Product, E T 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV 100kHz, 250mV >0.1VDC 5kHz, 5V 120 280 205 362 3.90 1.20 0.90 250 445 5.00 3.00 1.50 µH µH µH pF Ω Vµs 20 23 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) All specifications typical at TA=25°C. 0°C to 70°C –40°C to 85°C –50°C to 125°C 300°C 300mA 400mA 6000VDC www.dc-dc.com 76250EN, 76253/XXEN EN Approved Converter Transformers MECHANICAL DIMENSIONS 15.00 2.54 1 15.00 3 5 2 4* 12.50 12.00 76250EN YYWW 6 4.10 0.56ø ±0.05 7.50 10.16 2.42 Pin Connections 76250EN (Top View) Primary 1 3 5 6 Secondary 2 1 3 5 Pin Connections 76253/XXEN (Top View) Primary Secondary 2 4 6 * 76250EN Pin not fitted. All dimensions in mm XX.XX ±0.25mm. All pins on a 2.54mm pitch and within ±0.25mm of true position. TYPICAL CHARACTERISTICS VOLTAGE CURVES 76253/35EN 10 8 6 4 FS=High 2 0 20 0 95 EFFICIENCY CURVES 76253/35EN 100 80 FS=High 60 FS=Low 40 100 110 VOLTAGE DEVIATION 76253/35EN 105 FS=Low FS=High FS=Low 90 0 20 40 60 80 Output Current (mA) 100 0 20 40 60 80 Output Current (mA) 100 -50 -25 0 25 50 75 Temperature (°C) 100 76253/55EN 10 8 6 4 2 0 0 100 200 300 Output Current (mA) 400 FS=Low/High 100 76253/55EN 110 76253/55EN FS=High 80 FS=Low 60 100 105 FS=High 40 20 0 0 100 200 300 Output Current (mA) 400 95 FS=Low 90 -50 -25 0 25 50 75 Temperature (°C) 100 C&D Technologies (NCL) Limited reserve the right to alter or improve the specification, internal design or manufacturing process at any time, without notice. Please check with your supplier or visit our web site to ensure that you have the current and complete specification for your product before use. © C&D Technologies (NCL) Limited 2000 NMP 7625XEN.2 No part of this publication may be copied, transmitted or stored in a retrieval system or reproduced in any way including, but not limited to, photography, photocopy, magnetic or other recording means, without prior written permission from C&D Technologies (NCL) Limited. Instructions for use are available from www.dc-dc.com C&D Technologies (NCL) Ltd Tanners Drive, Blakelands North Milton Keynes MK14 5BU, England Tel: +44 (0)1908 615232 Fax:+44 (0)1908 617545 email: info@cdtechno-ncl.com www: http://www.dc-dc.com C&D Technologies (NCL), Inc. 8917 Glenwood Avenue, Raleigh NC 27612, USA Tel: +1 (919) 571-9405 Fax: +1 (919) 571-9262 email: info@us.cdtechno-ncl.com