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78253/35 Datasheet(PDF) 1 Page - C&D Technologies |
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78253/35 Datasheet(HTML) 1 Page - C&D Technologies |
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1 / 2 page  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 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, L S 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 D.C. Resistance, RDC >0.1VDC 0.40 1.00 Ω 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, L S 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 D.C. Resistance, RDC >0.1VDC 0.70 1.50 Ω 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, L S 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 D.C. Resistance, RDC >0.1VDC 0.30 0.50 Ω 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, L S 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 D.C. Resistance, RDC >0.1VDC 0.40 0.60 Ω 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=25°C. SELECTION GUIDE Input Output Output Isolation Turns Package Voltage Voltage Current Voltage Ratio Style Order Code (V) (V) (mA Max) (VDC) 78253/35 3.3 5.0 100 1500 1: √5 DIP 78253/35M SM 78253/55 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 |
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