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NQ15W50SGA30NSG-G Datasheet(PDF) 8 Page - SynQor Worldwide Headquarters |
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NQ15W50SGA30NSG-G Datasheet(HTML) 8 Page - SynQor Worldwide Headquarters |
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8 / 11 page  Product # NQ15W50SGA30 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS163E Rev. C 10/03/08 Page 8 Input: Outputs: Current: Package: 6.0 - 15.0V 0.8 - 5.0V 30A SMT Technical Specification BASICOPERATIONANDFEATURES The NiQor series non-isolated converter uses a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. The NiQor modules employ synchronous rectification for very high efficiency. Dissipation throughout the converter is so low that it does not require a heatsink or metal baseplate for operation. The NiQor converter can thus be built more simply and reliably using high yieldsurfacemounttechniquesonasinglePCBsubstrate. The NiQorseriesofSIPsandSMTconvertersusestheestablished industry standard footprint and pin-out configurations. CONTROLFEATURES REMOTE ON/OFF:The ON/OFF input permits the user to control when the converter is on or off. There are currently two options available for the ON/OFF input described in the table below.Othersmaybecomeavailableifdemandexists. OUTPUT VOLTAGE TRIM:TheTRIMinputpermitstheuserto adjusttheoutputvoltageaccordingtothetrimrangespecifica- tionsbyusinganexternalresistor.IftheTRIMfeatureisnotbeing used,leavetheTRIMpindisconnected. TRIM-UP:To increase the output voltage from the nominal setpoint of 0.8V using an external resistor, connect the resistor Rtrim-upbetweentheTRIMandtheGroundpinaccordingtothe diagram below. Foradesiredincreaseofthenominaloutputvoltage,thevalueof theresistorshouldbe: To maintain the accuracy of the output voltage over load current, it is vital that any trim-up resistor be terminated directly to the converter’s ground foot, not at the connection to the load.A separate Kelvin connection to the PCB pad for the ground foot is optimal. Trim-down resistors should be terminated at the con- verter’sSense+pin. Wedonot recommend bypassing the trim pin directly to ground with a capacitor. The voltage gain from the trim pin to output isratherlarge,15:1.Groundbouncethroughabypasscapaci- tor could introduce significant noise to the converter’s control circuit. PROTECTIONFEATURES Input Under-Voltage Lockout:Theconverterisdesignedto turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the appli- cationnotetitled“InputSystemInstability”.Thelockoutcircuitry isacomparatorwithDChysteresis.Whentheinputvoltageis rising,itmustexceedthetypicalTurn-OnVoltageThresholdvalue (listed on the specification page) before the converter will turn on.Oncetheconverterison,theinputvoltagemustfallbelow thetypicalTurn-OffVoltageThresholdvaluebeforetheconverter will turn off. Output Current Limiting:Toprovideprotectioninanoutput over load fault condition, the unit is equipped with internal over- currentprotection.Whentheover-currentprotectionistriggered, the unit enters hiccup mode. The units operate normally once the fault condition is removed. Internal Over-Voltage Protection:To fully protect from excessiveoutputvoltage,thisseriescontainscontainsanOutput Over-Voltage Shutdown circuitry.This OVP is independent of thetrimmedsetpoint.Assuch,theconverter’sloadisprotected from faults in the external trim circuitry (such as a trim pin shorted toground).SincethesetpointofthisOVPdoesnottracktrim, itissetat6.0V.FormoredetailedinformationcontactSynQor technical support. Rtrim-up Vin On/Off Vout Sense+ Trim Gnd where VDES=DesiredOutputVoltage (W) Rtrim-up = VDES-0.8 1200 _ 100 or (W) VOUT = 1200 Rtrim-up +100 0.8+ |
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