78253 CANDD | Alldatasheet

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Technical content

FEATURES

n 3.3V and 5V Versions n Isolation to 4kV n Frequency Range to 500kHz n Toroidal Construction n Industrial Standard Pinout n UL 94V-0 Package Material n Fully Encapsulated n Low Profile n 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 280°C 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, LP 100kHz, 250mV 0.30 0.38 0.46 mH Secondary Inductance, LS 100kHz, 250mV 1.60 2.00 2.40 mH Leakage Inductance, LL 100kHz, 250mV 0.30 1.00 µH Interwinding Capacitance, CWW 100kHz, 250mV 30 50 pF Volt-time Product, ET 5kHz, 5V 50 80 Vµs 78253/55(M) CHARACTERISTICS Parameter Conditions MIN TYP MAX Units Primary Inductance, LP 100kHz, 250mV 0.60 0.83 1.10 mH Secondary Inductance, LS 100kHz, 250mV 1.10 1.40 1.70 mH Leakage Inductance, LL 100kHz, 250mV 0.35 1.00 µH Interwinding Capacitance, CWW 100kHz, 250mV 30 50 pF Volt-time Product, ET 5kHz, 5V 50 65 Vµs 78253/35(M)V CHARACTERISTICS Parameter Conditions MIN TYP MAX Units Primary Inductance, LP 100kHz, 20mV 110 142 185 µH Secondary Inductance, LS 100kHz, 20mV 550 710 850 µH Leakage Inductance, LL 100kHz, 250mV 3.00 5.00 µH Interwinding Capacitance, CWW 100kHz, 250mV 4.20 8.00 pF Volt-time Product, ET 5kHz, 5V 30 42 Vµs 78253/55(M)V CHARACTERISTICS Parameter Conditions MIN TYP MAX Units Primary Inductance, LP 100kHz, 20mV 190 240 310 µH Secondary Inductance, LS 100kHz, 20mV 350 444 540 µH Leakage Inductance, LL 100kHz, 250mV 5.20 8.00 µH Interwinding Capacitance, CWW 100kHz, 250mV 4.20 8.00 pF Volt-time Product, ET 5kHz, 5V 25 32 Vµs Operating free air temperature range –40°C to 85°C Storage temperature range –50°C to 125°C Lead Temperature 1.5mm from case for 10 seconds 300°C Peak current IPK 400mA Isolation voltage 78253/XX(M) (flash tested for 1 second) 1500VDC Isolation voltage 78253/XX(M)V (flash tested for 1 second) 4000VDC ABSOLUTE MAXIMUM RATINGS All specifications typical at TA= 2 5 ° C . SELECTION GUIDE Input Output Output Isolation Turns Package Voltage Voltage Current Voltage Ratio Style Order Code (V) (V) (mA Max) (VDC) 3.3 5.0 100 1500 1:√5 DIP 78253/35M SM 5.0 5.0 200 1500 1:1.31 DIP 78253/55M SM 78253/35V 3.3 5.0 100 4000 1:√5 DIP 78253/35MV SM 78253/55V 5.0 5.0 200 4000 1:1.36 DIP 78253/55MV SM

78253 SERIES

MAX253 Compatible Converter Transformers www.dc-dc.com

MAX253 Compatible Converter Transformers 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 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 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 MECHANICAL DIMENSIONS TYPICAL CHARACTERISTICS (VOLTAGE CURVES)

6 Pin DIP 6 Pin SM

9.52 max 8.89 max Primary Secondary 6.35 3.44±0.50 0.30 0.20 0.63 0.53 10.16 2.54 78250M XYYWW 9.52 max Top ViewTop View 8.89 max 6.35 0.90 12.70 0.30 0.20 0.63 0.53 2.54 Primary Secondary XYYWW 0 20 40 60 80 100 120 Output Current (mA) FS=High FS=Low 78253/35(M) 0 100 200 300 400 Output Current (mA) FS=Low/High 78253/55(M) 0 20 40 60 80 100 Output Current (mA) FS=High FS=Low 78253/35(M)V 0 100 200 300 400 Output Current (mA) FS=High FS=Low 78253/55(M)V 0 20 40 60 80 100 120 Output Current (mA) FS=High FS=Low 78253/35(M) 100 0 100 200 300 400 Output Current (mA) FS=Low/High 78253/55(M) 100 0 20 40 60 80 100 Output Current (mA) FS=High FS=Low 78253/35(M)V 100 0 100 200 300 400 Output Current (mA) FS=Low FS=High 78253/55(M)V 100 -50 -25 0 25 50 75 100 Temperature (°C) FS=Low 78253/35(M) 1 1 0 105 100 9 5 9 0 FS=High -50 -25 0 25 50 75 100 Temperature (°C) FS=Low 78253/55(M) 1 1 0 1 05 1 00 9 5 9 0 FS=High -50 -25 0 25 50 75 100 Temperature (°C) FS=Low 78253/35(M)V 1 1 0 1 05 1 00 9 5 9 0 FS=High -50 -25 0 25 50 75 100 Temperature (°C) FS=Low 78253/55(M)V 1 1 0 1 05 1 00 9 5 9 0 FS=High EFFICIENCY CURVES VOLTAGE DEVIATION VOLTAGE CURVES