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PQ60120HZB50NNS-G Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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PQ60120HZB50NNS-G Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 13 page  Input: Output: Current: Package: 35-75 V 12 V 50 A (600W) Half-brick Technical Specification Product # PQ60120HZx50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HZ612J Rev. D 06/12/09 Page 10 To increase the output voltage, the user should connect a resistorbetweenPin6(TRIM)andPin7(SENSE(+)input).For a desired increase of the nominal output voltage, the value of the resistor should be FigureBgraphstherelationshipbetweenthetrimresistorvalue, Rtrim-up and Rtrim-down, showing the total range the output voltage can be trimmed up or down. Figure B: Trim Graph for 12Vout module Note:TheTRIMfeaturedoesnotaffectthevoltageatwhichthe output over-voltage protection circuit is triggered. Trimming the output voltage too high may cause the over-voltage protection circuit to engage, particularly during transients. ItisnotnecessaryfortheusertoaddcapacitanceattheTrim pin. The node is internally filtered to eliminate noise. Limited 10% up-trim:Thisconverteriscapableofoperating for an indefinite period of time with the output trimmed up to 5% above the nominal 12V output level*.It may also be trimmeddownbyasmuchas50%(to6.0V)indefinitely. This converter is also capable of being trimmed up by as much as10%(upto13.2V)forshorterperiodsoftimethatarenot asignificantfractionoftheproductlifetime.Forexample,ina test situation, or for output voltage margining where it would remaintrimmedupbetween5%and10%ofthenominalvoltage for a few hundred hours, but not for an indefinite period or the productlifetime.TheOVPtrippointissetabovethislevel,so it will not shut down from output overvoltage protection when trimmed up between 5% and 10%.Continuous operation of thisconverterwhiletrimmedupmorethan5%couldaffectlong term reliability. Total DC Variation of Vout:Fortheconvertertomeetitsfull specifications, the maximum variation of the DC value of Vout, due to both trimming and remote load voltage drops, should not be greater than that specified for the output voltage trim range. PROTECTIONFEATURES Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping to avoid an input system instability problem, which is described in more detail in the application note titled “Input System Instability” on the SynQor website. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical “Turn-On Voltage Threshold” value* before theconverterwillturnon.Oncetheconverterison,theinput voltagemustfallbelowthetypicalTurn-OffVoltageThreshold value before the converter will turn off. Output Current Limit:Iftheoutputcurrentexceedsthe“Output DCCurrentLimitInception”point*,thenafastlinearcurrentlimit controller will reduce the output voltage to maintain a constant output current. If as a result, the output voltage falls below the “Output DC Current Limit Shutdown Voltage”* for more than 50ms, then the unit will enter into hiccup mode, with a 500ms off-time. The unit will then automatically attempt to restart. Back-Drive Current Limit:Ifthereisnegativeoutputcurrent of a magnitude larger than the “Back-Drive Current Limit while Enabled”specification*,thenafastback-drivelimitcontrollerwill increase the output voltage to maintain a constant output current. Ifthisresultsintheoutputvoltageexceedingthe“OutputOver- VoltageProtection”threshold*,thentheunitwillshutdown.The fullI-VoutputcharacteristicscanbeseeninFigure17. Output Over-Voltage Limit: If the voltage directly across the output pins exceeds the “Output Over-Voltage Protection” threshold*,theconverterwillimmediatelystopswitching.This shutdownislatching;unlikeothershutdowntypes,theconverter willnotrestartunlesstheinputpoweriscycledortheON/OFF input is toggled. Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module. The thermal shutdown circuit is designed to turn the converter off whenthetemperatureatthesensedlocationreachesthe“Over- Temperature Shutdown” value*. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the “Over-Temperature Shutdown Restart Hysteresis”value*. * See Electrical Characteristics page. 0.0 0.1 1.0 10.0 100.0 1,000.0 10,000.0 0 5 10 15 20 25 30 35 40 45 50 % Increase in Vout % Decrease in Vout Rtrim- up kW = Vnominal 1.225 VDES–VNOM x VDES+VNOM –2 ) ( |
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