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NQ15W50SGA30PSD-G Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters |
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NQ15W50SGA30PSD-G Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters |
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9 / 11 page  Product # NQ15W50SGA30 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS163E Rev. C 10/03/08 Page 9 Input: Outputs: Current: Package: 6.0 - 15.0V 0.8 - 5.0V 30A SMT Technical Specification Over-Temperature Shutdown:Atemperaturesensoronthe converter senses the average temperature of the module. The ther- mal shutdown circuit is designed to turn the converter off when the temperatureatthesensedlocationreachestheOver-Temperature Shutdownvalue.Itwillallowtheconvertertoturnonagainwhen the temperature of the sensed location falls by the amount of the Over-TemperatureShutdownRestartHysteresisvalue. APPLICATIONCONSIDERATIONS Input Filtering/Capacitance/Damping:Thefiltercircuitof FigureEisoftenaddedtotheconverter’sinputtopreventswitch- ing noise from reaching the input voltage bus. In the SGA30 (surface mount) converters Cin = 20µF of high quality ceramic capacitors.With Lin of 1µH, Cd should be 100-200µF and Rd should be 0.1-0.2W, in most applications. Formoreinformationondesigningtheinputfilterandchoosing proper values, contact SynQor technical support. Adding significant external pure ceramic capacitance directly across the converter’s input pins is not recommended.Parasitic inductanceassociatedwiththeinputpingeometryandPCBtraces cancreateahigh-QCLCcircuitwithanyexternalcapacitors.Just a few nano-Henries of parasitic inductance can create a resonance (or an overtone) near the converter’s switching frequency.To avoid this high-frequency resonance, any external input filter shouldexhibitanetsourceimpedanceofatleast20mW resistive through this frequency range. This requirement is easily met with the damping elements discussed above. Adding a small amount (a fewµF)ofhigh-frequencyexternalceramicwillnotviolateit. Ifusingconvertersathigherpowers,considertheripplecurrent rating of Cd. Contact SynQor technical support for details. Output Capacitance:Itisrecommendedtoaddatleast100µF ofcapacitance,withanESRinthe0.1W range, to the output of theSGA30seriesofconverters.Inmanyapplications,however, additional external output capacitance is required to reduce the response to load transients to an allowable level. Forminimalovershootuponrecovery,Cdshouldberelatedtothe minimumin-circuitnetESR. For more detailed derivations of these values contact SynQor technical support. Active Load Sharing:Foradditionalpowerrequirements,the SGA30seriesofconvertershaveaparallelfeatureavailable.To implement forced load sharing, the following connections should bemade: • The share pins of all units in parallel must be connected together. The path of these connections should be as direct as possible. •AllON/OFFpinsshouldbeconnectedtogether. The share bus is not designed for redundant operation and the system will be non-functional upon failure of one of the units when multipleunitsareinparallel.Whennotusingtheparallelfeature, leave the share pin open. SURFACEMOUNTINFORMATION PCB Layout Considerations: SynQor recommends that the customer use a non-solder mask defined pad design. The minimumrecommendedpadsizeis0.074”x0.122”(1.88mm x 3.1mm) and the maximum pad size is 0.095” x 0.140” (2.41mmx3.56mm),seethemechanicaldiagramonpage2. Interconnection to internal power planes is typically required. This can be accomplished by placing a number of vias between the SMT pad and the relevant plane. The number and location of the vias should be determined based on electrical resistance, currentandthermalrequirements.“Via-in-pad”designshouldbe avoided in the SMT pads. Solder mask should be used to elimi- nate solder wicking into the vias. Pick and Place: The NiQor surface mount modules are designed for automated assembly using standard SMT pick and place equipment. The modules have a centrally located inductor component with a flat surface area to be used for component pick-up. The units use open frame construction and have a low mass that is within the capability of standard pick and place equipment. Those modules however have a larger mass than most conventionalSMTcomponentsandsovariablessuchasnozzle size,tipstyle,handlingspeed,andplacementpressureshouldbe optimizedforbestresults.Aconformaltippedplacementnozzle design is recommended.Coplanarity of better than 0.004” (0.1mm)isachievedthroughtheSMTNiQor’sterminaldesign. Figure H: Converter with Additional Output Capacitance Figure E: converter with Input Filter |
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