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NDXS4812C Datasheet(PDF) 4 Page - Murata Manufacturing Co., Ltd. |
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NDXS4812C Datasheet(HTML) 4 Page - Murata Manufacturing Co., Ltd. |
4 / 6 page NDX Series Isolated 7.5W Wide Input Single & Dual Output DC/DC Converters KDC_NDXC.G01 Page 4 of 6 All enquiries: www.murata-ps.com/support www.murata-ps.com APPLICATION NOTES External Capacitance Although these converters will work without external capacitors, they are necessary in order to guarantee the full parametric performance over the full line and load range. All parts have been tested and characterised using the following values and test circuit. Value Input Voltage CIN COUT1 COUT2 5V & 12V 100μF, 100V 0.1μF, 25V multi-layer ceramic 100μF, 25V (low ESR) 24V & 48V 10μF, 200V Recommended Input & Output Capacitors Control Pin Cross Regulation Dual Output: This provides an OFF function, which puts the converter into a low power mode. When the pin is high the converter is OFF. Standard TTL levels can be used but the maximum high level must not exceed 7.0V. The pin can be left open for normal operation or at voltage below 0.8V with respect to the -VIN pin. Single Output: As per dual output, however a series diode must be fitted when the control pin is used on the single output variants. Recommended diode 1N4148 or similar (direction of fitting is cathode to control pin). Load regulation is at its best when the positive and negative loads are balanced. When the loads are asymmetric, the negative output is not as tightly regulated as the positive output. To meet ripple specification a total minimum load of 25% full load is required, however, the NDX can be used with much lighter loading at the expense of increased ripple. A small load of 150mW is required on the negative output to ensure the maximum negative output voltage is not exceeded. NDX cross regulation is defined on page 2. Minimum load The minimum load for correct operation is 25% of the full rated load across the specified input voltage range. Lower loads may cause a significant increase in output ripple and may cause the output voltage to exceed its specification transiently during power-down when the input voltage also falls below its rated minimum. A minimum loading of 30% load is required on NDXD4805 to prevent output voltage rise above specification during power-down. TECHNICAL NOTES ISOLATION 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. Murata Power Solutions NDX 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 NDX 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 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 environment. The NDX 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. NDXDC CIN +VOUT -VIN +VIN -VOUT OV COUT2 COUT2 COUT1 COUT1 NDXSC CIN +VOUT -VIN +VIN OV COUT2 COUT1 |
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