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MQFL-28VE-3R3S-Y-ES Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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MQFL-28VE-3R3S-Y-ES Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 16 page  Product # MQFL-28-3R3S Phone 1-888-567-9596 www.synqor.com Doc.# 005-2MQ330S Rev. C 11/29/07 Page 11 Output: Output: Current: Current: 3.3 V 3.3 V 30 A 30 A MQFL-28-3R3S MQFL-28-3R3S T T T Te e e ec c c ch h h hn n n niiiic c c ca a a allll S S S Sp p p pe e e ec c c ciiiiffffiiiic c c ca a a attttiiiio o o on n n n CURRENT SHARE: When several MQFL converters are placed in parallel to achieve either a higher total load power or N+1 redundancy, their SHARE pins (pin 11) should be connected together. The voltage on this common SHARE node represents the average current delivered by all of the paralleled converters. Each converter monitors this average value and adjusts itself so that its output current closely matches that of the average. Since the SHARE pin is monitored with respect to the OUTPUT RETURN (pin 8) by each converter, it is important to connect all of the converters’ OUTPUT RETURN pins together through a low DC and AC impedance. When this is done correctly, the con- verters will deliver their appropriate fraction of the total load cur- rent to within +/- 10% at full rated load. Whether or not converters are paralleled, the voltage at the SHARE pin could be used to monitor the approximate average current delivered by the converter(s). A nominal voltage of 1.0V represents zero current and a nominal voltage of 2.2V represents the maximum rated current, with a linear relationship in between. The internal source resistance of a converter’s SHARE pin signal is 2.5 kW. During an input voltage fault or primary disable event, the SHARE pin outputs a power failure warning pulse. The SHARE pin will go to 3V for approximately 14ms as the output voltage falls. NOTE: Converters operating from separate input filters with reverse polarity protection (such as the MQME-28-T filter) with their outputs connected in parallel may exhibit hiccup operation at light loads. Consult factory for details. OUTPUT VOLTAGE TRIM: If desired, it is possible to increase the MQFL converter’s output voltage above its nominal value. To do this, use the +SENSE pin (pin 10) for this trim function instead of for its normal remote sense function, as shown in Figure D. In this case, a resistor connects the +SENSE pin to the –SENSE pin (which should still be connected to the output return, either remotely or locally). The value of the trim resistor should be cho- sen according to the following equation or from Figure E: Rtrim = 100 x Vnom [Vout – Vnom – 0.025] where: Vnom = the converter’s nominal output voltage, Vout = the desired output voltage (greater than Vnom), and Rtrim is in Ohms. As the output voltage is trimmed up, it produces a greater voltage stress on the converter’s internal components and may cause the converter to fail to deliver the desired output voltage at the low end of the input voltage range at the higher end of the load cur- rent and temperature range. Please consult the factory for details. Factory trimmed converters are available by request. 100 1,000 10,000 100,000 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 Increase in Vout (V) Figure D: Typical connection for output voltage trimming. 28Vdc +VIN Load IN RTN CASE ENA 1 SYNC OUT SYNC IN ENA 2 SHARE + SNS – SNS OUT RTN +VOUT 1 2 3 4 5 6 12 11 10 9 8 7 open means on Rtrim + – + – Figure E: Output Voltage Trim Graph |
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Similar Description - MQFL-28VE-3R3S-Y-ES |
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