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WRA4815YLS-3W Datasheet(PDF) 2 Page - Microdc power Technology Co., Ltd |
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WRA4815YLS-3W Datasheet(HTML) 2 Page - Microdc power Technology Co., Ltd |
2 / 4 page WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W WRA-YLS-3W Series Series http://www.microdc.cn Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646 Page 2 of 4 TEMPERATURE TEMPERATURE TEMPERATURE TEMPERATURE TEMPERATURE TEMPERATURE TEMPERATURE TEMPERATURE CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS Parameter Parameter Parameter Parameter Conditions Conditions Conditions Conditions MIN. MIN. MIN. MIN. TYP. TYP. TYP. TYP. MAX. MAX. MAX. MAX. Units Specifcation -40 85 °C Operation -40 100 Storage -50 130 Case temperature rise above ambient 12V & 15V output types @ 100% load 36 MTTF MTTF MTTF MTTF MTTF MTTF MTTF MTTF (MEAN (MEAN (MEAN (MEAN (MEAN (MEAN (MEAN (MEAN TIME TIME TIME TIME TIME TIME TIME TIME TO TO TO TO TO TO TO TO FAILURE) FAILURE) FAILURE) FAILURE) FAILURE) FAILURE) FAILURE) FAILURE) Part Part Part Part Number Number Number Number MTTF MTTF MTTF MTTF Units Units Units Units Conditions WRA2412YLS-3W 2077 kHrs Calculated using MIL-HDBK 217F with Nominal input at full voltage (ground benign) at 25°C. WRA2415YLS-3W 2080 WRA4812YLS-3W 2090 WRA4815YLS-3W 2045 GENERAL GENERAL GENERAL GENERAL GENERAL GENERAL GENERAL GENERAL CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS Parameter Parameter Parameter Parameter Conditions Conditions Conditions Conditions MIN. MIN. MIN. MIN. TYP. TYP. TYP. TYP. MAX. MAX. MAX. MAX. Units Control pin (CTRL) input current Please refer to control pin application note 6 15 mA Switching frequency Load causing lowest frequencies, 100% load VIN MIN. 100 125 150 kHz Load causing highest frequencies, 25% load VIN MAX. 300 400 500 ISOLATION ISOLATION ISOLATION ISOLATION ISOLATION ISOLATION ISOLATION ISOLATION CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS CHARACTERISTICS Parameter Parameter Parameter Parameter Conditions Conditions Conditions Conditions MIN. MIN. MIN. MIN. TYP. TYP. TYP. TYP. MAX. MAX. MAX. MAX. Units Isolation test voltage Flash tested for 1 second 1000 VDC Resistance VISO = 1000VDC 1 GΩ TECHNICAL TECHNICAL TECHNICAL TECHNICAL TECHNICAL TECHNICAL TECHNICAL TECHNICAL NOTES NOTES NOTES NOTES NOTES NOTES NOTES NOTES ISOLATION ISOLATION ISOLATION ISOLATION VOLTAGE VOLTAGE VOLTAGE VOLTAGE ‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘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 component designed to provide electrical isolation, to verify the integrity of that isolation. MICRODC WRA-YLS-3W series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second. 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 approvals, such as the WRA-YLS-3W series, 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 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-accessible circuitry according to safety standard requirements. REPEATED REPEATED REPEATED REPEATED HIGH-VOLTAGE HIGH-VOLTAGE HIGH-VOLTAGE HIGH-VOLTAGE ISOLATION ISOLATION ISOLATION ISOLATION TESTING TESTING TESTING 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 environment. The WRA-YLS-3W series has an EI ferrite core, 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 depend 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 therefore 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 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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