高性能电流模式PWM控制器MXT7111.pdf

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1、MXT7111CurrentModePWMPowerSwitchFreqShufflingProductSpecificationGENERALDESCRIPTIONdesignandaudionoiseiseliminatedduringMXT7111isahighlyintegratedcurrentmodePWMoperation.controlICoptimizedforhighperformance,lowMXT7111isofferedinSOT23-6packages.standbypowerandcostef

2、fectiveofflineflybackconverterapplicationsinsub36Wrange.FEATURESPWMswitchingfrequencyatnormaloperationis■Level5compliancewith<100mWstandbyexternallyprogrammableandtrimmedtotightpoweratuniversalACinput.range.■PowerSourceProprietaryFrequencyShufflingAtnoloadorlightlo

3、adcondition,theICoperatesinTechnologyforImprovedEMIPerformance.extended‘burstmode’tominimizeswitchingloss.■ExtendedBurstModeControlForImprovedLowerstandbypowerandhigherconversionEfficiencyandMinimumStandbyPowerDesignefficiencyisthusachieved.■AudioNoiseFreeOperation

4、VDDlowstartupcurrentandlowoperatingcurrent■ExternalProgrammablePWMSwitchingcontributetoareliablepoweronstartupdesignwithFrequencyMXT7111.Alargevalueresistorcouldthusbeused■InternalSynchronizedSlopeCompensationinthestartupcircuittominimizethestandbypower.■LowVDDStar

5、tupCurrentandLowOperatingTheinternalslopecompensationimprovessystemCurrent(1.4mA)largesignalstabilityandreducesthepossible■LeadingEdgeBlankingonCurrentSenseInputsubharmonicoscillationathighPWMdutycycle■GoodProtectionCoverageWithAutoSelf-output.RecoveryLeading-edgeb

6、lankingoncurrentsense(CS)inputoVDDOverVoltageClampandUnderVoltageremovesthesignalglitchduetosnubbercircuitLockoutwithHysteresis(UVLO)diodereverserecoveryandthusgreatlyreducestheoGateOutputMaximumVoltageClamp(18V)externalcomponentcountandsystemcostintheoPowerSourceP

7、roprietaryLineInputdesign.CompensatedCycle-by-CycleOver-currentMXT7111offerscompleteprotectioncoveragewithThresholdSettingautomaticself-recoveryfeatureincludingCycle-by-ForConstantOutputPowerLimitingOverCyclecurrentlimiting(OCP),overloadprotectionUniversalInputVolt

8、ageRange.(OLP),VDDovervoltageclampandundervoltageoOverloadProtection(OLP)lockout(UVLO).TheGate-driveoutputisclampedtomaximum18VtoprotectthepowerM