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KMP-78253 Datasheet(PDF) 4 Page - Murata Power Solutions Inc. |
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KMP-78253 Datasheet(HTML) 4 Page - Murata Power Solutions Inc. |
4 / 5 page KMP_78253C_D05 Page 4 of 5 78253 Series MAX253 Compatible Converter Transformers www.murata-ps.com/support TYPICAL CHARACTERISTICS (VOLTAGE CURVES) continued VOLTAGE DEVIATION Temperature (°C) Temperature (°C) Temperature (°C) Temperature (°C) 78253/35(M)C 110 105 100 95 90 -50 0 50 25 -25 75 100 78253/55(M)C 110 105 100 95 90 -50 0 50 25 -25 75 100 78253/35(M)VC 110 105 100 95 90 -50 0 50 25 -25 75 100 78253/55(M)VC 110 105 100 95 90 -50 0 50 25 -25 75 100 SOLDERING INFORMATION1 Pin finish Matte tin Peak wave solder temperature 300˚C for 10 seconds Peak reflow temperature 220˚C2 TUBE OUTLINE DIMENSIONS All specifications typical at T A=25°C 1 For further information, please visit www.murata-ps.com/rohs 2 For high temperature reflow parts see 78253J series. 0.023±0.005 (0.60±0.15) 0.16 (4.00) 0.22 (5.50) 0.43 (10.95) 0.51 (12.95) 0.15 (3.80) 0.62 (15.70) Tube length: 18.3±0.08 (465±2). Tube quantity: 50. Tube material: Antistatic coated clear pvc. Unless otherwise stated all dimensions in inches(mm) ±0.01 (0.25). TECHNICAL NOTES ISOLATION VOLTAGE ‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Volt- age’, ‘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 compo- nent 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. A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?” For a part holding no specific agency approv- als both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part could be expected to function correctly with several hundred volts offset applied continuously across the isolation bar- rier; but then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry ac- cording to safety standard requirements. 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 ma- terials, construction and environment. This series has toroidal isolation transformers, with no additional insulation between pri- mary and secondary windings of enameled wire. While parts can be expected to with- stand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically polyurethane) is suscep- tible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation test- ing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage. This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further insulation system of physical spacing or barriers. |
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