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KMP_782485C Scheda tecnica(PDF) 1 Page - Murata Manufacturing Co., Ltd. |
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KMP_782485C Scheda tecnica(HTML) 1 Page - Murata Manufacturing Co., Ltd. |
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1 / 2 page  KMP_782485C_A03 Page 1 of 2 Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 www.murata-ps.com 782485 Series ADM2485 Compatible Converter Transformers For full details go to www.murata-ps.com/rohs SELECTION GUIDE Order Code Nominal Input Voltage Nominal Output Voltage Max. Output Current Isolation Voltage Turns Ratio Package Style V V mA VRMS 782485/35C 3.3 6.0 200 2500 1CT:2.2CT DIL 782485/55C 5.0 6.0 200 2500 1CT:1.5CT DIL CHARACTERISTICS 782485/35C Parameter Conditions 782485/35C 782485/55C Units Typ. Max. Typ. Max. Primary Inductance, L P 100kHz, 10mV 234 513 μH Leakage Inductance, L L 100kHz, 10mV 168 192 nH Interwinding Capacitance, C WW 100kHz, 10mV 24 50 37 50 pF Primary DC Resistance, R DC <0.1VDC 273 500 383 600 mΩ Volt-time Product, Et1 5kHz, 5V 12 19 Vμs ABSOLUTE MAXIMUM RATINGS Operating free air temperature range -40°C to 85°C Storage temperature range -50°C to 125°C Isolation voltage (flash tested for 1 second) 2.5kVrms SOLDERING INFORMATION2 Peak wave solder temperature 300˚C for 10 seconds Pin finish Matte tin Specifications typical at T A = 25°C 1 Where pulse applied across pins 1 and 2. 2 For further information, please visit www.murata-ps.com/rohs TECHNICAL NOTES ISOLATION VOLTAGE ‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Volt- age’, ‘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 component 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 opera- tion?” For a part holding no specific agency approvals both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC. The isolation test volt- age 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 cor- rectly with several hundred volts offset applied continuously across the isolation barrier; 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-acces- sible circuitry according 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 materials, construction and environ- ment. This series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enameled wire. While parts can be expected to withstand several times the stated test voltage, the isolation capability does de- pend on the wire insulation. Any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We there- fore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage. This consideration equally applies to agency recog- nized parts rated for better than functional isolation where the wire enamel insulation is always supple- mented by a further insulation system of physical spacing or barriers. FEATURES RoHS compliant Analog Devices ADM2485 compatible 2.5kVrms isolation Industry-standard pinout UL 94 V-0 package materials Low profile Toroidal construction Fully encapsulated Industrial temperature range Surface mount versions available soon Recommended by Analog Devices, Inc. Backward compatible with Sn/Pb soldering systems DESCRIPTION The 782485 series of converter transformers are specifically designed for use with Analog Devices chipsets to provide isolated RS-485 and RS-422 interfaces. Carefully controlled turns ratios ensure consistent performance whilst a toroidal construction minimises EMI. |
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