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| 78253 SERIES MAX253 Compatible Converter Transformers SELECTION GUIDE Input Voltage Output Voltage Output Current Isolation Voltage Turns Ratio Package Style Order Code 78253/35 78253/35M 78253/55 78253/55M 78253/35V 78253/35MV 78253/55V 78253/55MV (V) 3.3 5.0 3.3 5.0 (V) 5.0 5.0 5.0 5.0 (mA Max) 100 200 100 200 (VDC) 1500 1500 4000 4000 1:5 1:1.31 1:5 1:1.36 DIP SM DIP SM DIP SM DIP SM FEATURES s Maxim Compatible s 3.3V and 5V Versions s Isolation to 4kV s Frequency Range to 500kHz s Toroidal Construction s Industrial Standard Pinout s UL 94V-0 Package Material s Fully Encapsulated s Low Profile s Surface Mount Available DESCRIPTION The 78253 series of 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 surface mount devices are fully compatible with CECC00802 to 280C which allows them to be placed and reflowed with IC's thus reducing time and cost in production. 78253/35(M) 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 0.30 1.60 0.38 2.00 0.30 30 0.40 0.46 2.40 1.00 50 1.00 mH mH H pF Vs 50 80 78253/55(M) 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 0.60 1.10 0.83 1.40 0.35 30 0.70 1.10 1.70 1.00 50 1.50 mH mH H pF Vs 50 65 78253/35(M)V 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, 20mV 100kHz, 20mV 100kHz, 250mV 100kHz, 250mV >0.1VDC 5kHz, 5V 110 550 142 710 3.00 4.20 0.30 185 850 5.00 8.00 0.50 H H H pF Vs 30 42 78253/55(M)V 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, 20mV 100kHz, 20mV 100kHz, 250mV 100kHz, 250mV >0.1VDC 5kHz, 5V 190 350 240 444 5.20 4.20 0.40 310 540 8.00 8.00 0.60 H H H pF Vs 25 32 ABSOLUTE MAXIMUM RATINGS Operating free air temperature range Storage temperature range Lead Temperature 1.5mm from case for 10 seconds Peak current IPK Isolation voltage 78253/XX(M) (flash tested for 1 second) Isolation voltage 78253/XX(M)V (flash tested for 1 second) -40C to 85C -50C to 125C 300C 400mA 1500VDC 4000VDC www.dc-dc.com All specifications typical at TA=25C. 78253 SERIES MAX253 Compatible Converter Transformers MECHANICAL DIMENSIONS 6 Pin DIP 9.52 max Top View Primary Secondary 6 Pin SM 12.70 9.52 max Top View Primary Secondary 1 8.89 max 2 3 6 5 4 8.89 max 1 2 3 6 5 4 78253 35 78250M XYYWW 6.35 XYYWW 6.35 3.440.50 0.30 0.20 10.16 2.54 0.63 0.53 0.30 0.20 0.90 2.54 0.63 0.53 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) VOLTAGE CURVES 10 8 6 4 2 0 0 20 40 60 80 100 120 Output Current (mA) FS=Low FS=High 78253/35(M) 10 8 6 4 2 0 0 100 200 300 Output Current (mA) 400 78253/55(M) FS=Low/High 10 8 6 4 2 0 0 20 40 60 80 Output Current (mA) 100 FS=High FS=Low 78253/35(M)V 10 8 6 4 2 0 0 100 200 300 Output Current (mA) 400 FS=High FS=Low 78253/55(M)V EFFICIENCY CURVES 100 80 60 40 20 0 0 20 40 60 80 100 120 Output Current (mA) 78253/35(M) FS=High FS=Low 100 80 60 40 20 0 0 100 200 300 Output Current (mA) 400 FS=Low/High 78253/55(M) 100 80 60 40 20 0 0 20 40 60 80 Output Current (mA) 100 FS=Low 78253/35(M)V FS=High 100 80 60 40 20 0 0 100 200 300 Output Current (mA) 400 FS=High 78253/55(M)V FS=Low VOLTAGE DEVIATION 110 105 100 95 90 110 110 110 78253/35(M) FS=High 78253/55(M) 105 100 FS=High FS=Low 105 100 95 90 78253/35(M)V FS=High 78253/55(M)V 105 FS=Low FS=Low 100 FS=Low FS=High 95 90 95 90 -50 -25 0 25 50 75 100 Temperature (C) -50 -25 0 25 50 75 100 Temperature (C) -50 -25 0 25 50 75 100 Temperature (C) -50 -25 0 25 50 75 100 Temperature (C) 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) C&D Technologies (NCL) Limited 2000 NMP 78253.2 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 |
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