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IQ36070HPC30NRS Datasheet(PDF) 29 Page - SynQor Worldwide Headquarters |
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IQ36070HPC30NRS Datasheet(HTML) 29 Page - SynQor Worldwide Headquarters |
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29 / 30 page  Technical Specification IQ36-HP Family Product # IQ36xxxHPXxx Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005231 Rev. A 05/26/09 Page 29 Startup Inhibit Period:TheStartupInhibitPeriodensuresthat theconverterwillremainoffforapproximately200mswhenitis shut down for any reason. When an output short is present, this generates a 5 Hz “hiccup mode,” which prevents the converter from overheating. In all, there are seven ways that the converter canbeshutdown,initiatingaStartupInhibitPeriod: • InputUnder-VoltageLockout • InputOver-VoltageShutdown • OutputOver-VoltageProtection • OverTemperatureShutdown • CurrentLimit • ShortCircuitProtection • TurnedoffbytheON/OFFinput FigureEshowsthreeturn-onscenarios,whereaStartupInhibit Period is initiated at t0, t1, and t2: Beforetimet0,whentheinputvoltageisbelowtheUVLthreshold, theunitisdisabledbytheInputUnder-VoltageLockoutfeature. WhentheinputvoltagerisesabovetheUVLthreshold,theInput Under-VoltageLockoutisreleased,andaStartupInhibitPeriodis initiated.Attheendofthisdelay,theON/OFFpinisevaluated, and since it is active, the unit turns on. Attimet1,theunitisdisabledbytheON/OFFpin,anditcannot beenabledagainuntiltheStartupInhibitPeriodhaselapsed. When the ON/OFF pin goes high after t2, the Startup Inhibit Period has elapsed, and the output turns on within the typical Turn-OnTime. Thermal Considerations: The maximum operating base-plate temperature, TB,is100ºC.Aslongastheuser’sthermalsystem keeps TB <100ºC,theconvertercandeliveritsfullratedpower. Apowerderatingcurvecanbecalculatedforanyheatsinkthatis attached to the base-plate of the converter. It is only necessary todeterminethethermalresistance,RTHBA, of the chosen heatsink between the base-plate and the ambient air for a given airflow rate. This information is usually available from the heatsink vendor. The following formula can the be used to determine the maximum power the converter can dissipate for a given thermal conditionifitsbase-plateistobenohigherthan100ºC. P max = 100 ºC-TA diss RTHBA Thisvalueofpowerdissipationcanthenbeusedinconjunction withthedatashowninFigure2todeterminethemaximumload current(andpower)thattheconvertercandeliverinthegiven thermal condition. Forconvenience,powerderatingcurvesforanencasedconverter without a heatsink and with a typical heatsink are provided for each output voltage. Figure E: Startup Inhibit Period (turn-on time not to scale) Under-Voltage LockoutTurn- OnThreshold ON/OFF (neglogic) Vout Vin 200ms 200ms 200ms (typicalstart-up inhibitperiod) t0 t1 t2 t 9ms (typical turnontime) ON ON ON OFF OFF |
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