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LT3757IMSE-TRPBF Datasheet(PDF) 7 Page - Linear Technology

Part # LT3757IMSE-TRPBF
Description  Boost, Flyback, SEPIC and Inverting Controller
Download  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3757IMSE-TRPBF Datasheet(HTML) 7 Page - Linear Technology

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LT3757

3757fb
pin FuncTions
VC (Pin 1):ErrorAmplifierCompensationPin.Usedto
stabilizethevoltageloopwithanexternalRCnetwork.
FBX (Pin 2):PositiveandNegativeFeedbackPin.Receives
the feedback voltage from the external resistor divider
acrosstheoutput.Alsomodulatesthefrequencyduring
start-upandfaultconditionswhenFBXisclosetoGND.
SS (Pin 3):Soft-StartPin.Thispinmodulatescompensa-
tionpinvoltage(VC)clamp.Thesoft-startintervalisset
withanexternalcapacitor.Thepinhasa10µA(typical)
pull-upcurrentsourcetoaninternal2.5Vrail.Thesoft-
startpinisresettoGNDbyanundervoltagecondition
atSHDN/UVLO,anINTVCCundervoltageorovervoltage
conditionoraninternalthermallockout.
RT (Pin 4):SwitchingFrequencyAdjustmentPin.Setthe
frequencyusingaresistortoGND.Donotleavethispin
open.
SYNC (Pin 5):FrequencySynchronizationPin.Usedto
synchronizetheswitchingfrequencytoanoutsideclock.
Ifthisfeatureisused,anRTresistorshouldbechosento
programaswitchingfrequency20%slowerthantheSYNC
pulsefrequency.TietheSYNCpintoGNDifthisfeatureis
notused.SYNCisignoredwhenFBXisclosetoGND.
SENSE (Pin 6):TheCurrentSenseInputfortheControl
Loop.Kelvinconnectthispintothepositiveterminalof
the switch current sense resistor in the source of the
N-channelMOSFET.Thenegativeterminalofthecurrent
senseresistorshouldbeconnectedtoGNDplaneclose
totheIC.
GATE (Pin 7): N-Channel MOSFET Gate Driver Output.
SwitchesbetweenINTVCCandGND.DriventoGNDwhen
ICisshutdown,duringthermallockoutorwhenINTVCCis
aboveorbelowtheOVorUVthresholds,respectively.
INTVCC (Pin 8):RegulatedSupplyforInternalLoadsand
GateDriver.SuppliedfromVINandregulatedto7.2V(typi-
cal).INTVCCmustbebypassedwithaminimumof4.7µF
capacitorplacedclosetopin.INTVCCcanbeconnected
directlytoVIN,ifVINislessthan17.5V.INTVCCcanalso
beconnectedtoapowersupplywhosevoltageishigher
than7.5V,andlowerthanVIN,providedthatsupplydoes
notexceed17.5V.
SHDN/UVLO (Pin 9):ShutdownandUndervoltageDetect
Pin.Anaccurate1.22V(nominal)fallingthresholdwith
externallyprogrammablehysteresisdetectswhenpower
isokaytoenableswitching.Risinghysteresisisgenerated
bytheexternalresistordividerandanaccurateinternal
2µApull-downcurrent.Anundervoltageconditionresets
sort-start.Tieto0.4V,orless,todisablethedeviceand
reduceVINquiescentcurrentbelow1µA.
VIN (Pin 10): InputSupplyPin.Mustbelocallybypassed
with a 0.22µF, or larger, capacitor placed close to the
pin.
Exposed Pad (Pin 11):Ground.Thispinalsoservesasthe
negativeterminalofthecurrentsenseresistor.TheExposed
Padmustbesoldereddirectlytothelocalgroundplane.


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