矽力杰Silergy SY8759 33-92V输入精准调光降压型LED控制器 规格书(Datasheet)佰祥电子

SY8759

HighEfficiency,33~92V,Step-downController

ForPrecisionDimmingLEDDriver

GeneralDescriptionFeatures

SY8759isahighefficiency,33V-92VwideinputvoltageInputRange:33V-92V

rangesynchronous/non-synchronousstep-downDC-WideAnalogDimmingRange:400:1

DCconstantcurrentandconstantvoltagecontrollerExcellentDimmingAccuracy:

targetingatprecisiondimmingLEDdriver.Thedevice±5%@25~100%

operatesattheproprietarycontrolwithconstantoff-time±25%@0.25%

architecturetoeasesthedesignofloopcompensationwhileGateDriver:Source8.8ΩandSink3.7Ω

maintainingtheconvertertobeoperatedatnearlyconstant

switchingfrequency.ItadoptsproprietaryPWMdimmingProgrammableSwitchingfrequency:

logicandlowoffseterroramplifiertoachieveextrawide20kHz~500kHz

dimmingrangeof400:1analogdimmingandhighSupportSynchronousandNon-synchronousBuck

precisionforallloadingrange.CC/CVOperationforOpenLEDandShortLED

ReliableSingle-faultProtection

SY8759providesreliablesingle-faultprotectionsforsafetyCompactPackage:SOP16

requirementsuchasShortCircuitProtection(SCP),Open

LEDProtection(OLP),inductorshortedprotection,Top

MOSshortprotectionandISENshortedprotection,etc.Applications

OrderingInformation

HighPrecisionDimmingLEDDriver

SY8759□(□□□)

PackageCode

OptionalSpecCode

OrderingNumberPackagetypeNote

SY8759FFPSOP16----

TypicalApplications

VIN=33V~92V

CIN

RVIN

CVIN

ENENVIND1:Non-syncbuck

RGH

RPSEN:addforRISENshortprotection

FAULTHGATEQH

PWMLX

PWMCBSL

VSENBST

DBST

FSETPGND

(opt)CVCC

D1(opt)RVSU

KISENVCC

RKISEN

CFLGATEQL

RFSETCOUT

RGL

CCFSGNDISENRVSD

CKISENRPSENRISEN

(opt)

Figure1.Schematicdiagram

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SY8759

Pinout(topview)

ENVIN

FAULTHGATE

PWMLX

VSENBST

FSETSOP16PGND

KISENVCC

CFLGATE

SGNDISEN

SOP16

TopMark:FRQxyz(devicecode:FRQ,x=yearcode,y=weekcode,z=lotnumbercode)

PinNamePinnumberPinDescription

EN1Enableinputpin

FAULT2FaultPinIndicateAbnormalState

PWM3Analogdimminginputpin,thispindetectsthePWMdimmingsignal

OutputvoltagedetectionPin.Thispinreceivesoutputvoltagebya

VSEN4

resistordivider.

FSET5Switchingfrequencysetpin,ConnectaresistortotheGNDpin

KISEN610xCurrentsenseamplifieroutputPin.

BypassthispintoGNDwithenoughcapacitancetoholdoninternal

CF7

voltagereference.

SGND8SignalGroundPin

ISEN9CurrentSensePin

LGATE10Low-sidegate-drivepin.ConnecttogateofexternalmainMOSFET

VCC11BiaspowersupplyforIC,connecta1uFcapfromthispintoPGND

PGND12PowerGroundPin

High-sidegate-drivefloatingsupplyVoltage.Connect100nF

BST13

bootstrapcapacitorfromthispinandLXpin

TheSourcePinofmainMOSFET.ConnecttheinductorbetweenLX

LX14

andOUT1PPin.

HGATE15High-sidegate-drivepin.ConnecttogateofexternalmainMOSFET

VIN16BuckInputPin

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SY8759

BlockDiagram

KISENx10

UVLO

ISENCOMPI

GM

VREFICC/CVlogicVCCbias

regulatorVIN

VSENCOMPV

GMVCC

VREFV

PWM

LOGICBST

Frequency

FSETSet&CalculatorHGATE

Driver

&UVLO

LX

DIM

ENON/OFF

LGATE

VCFRefVREFIPGND

2.5V

CalculatorError

detect

SGND

PWMCFFAULT

(0.25%~100%)

Figure.2BlockDiagram

AbsoluteMaximumRatings(Note1)

VIN,VSEN----------------------------------------------------------------------------------------------------------------0.3V~96V

LX----------------------------------------------------------------------------------------------------------------------------1V~96V

BST,HGATE--------------------------------------------------------------------------------------------------------------1V~105V

BST-LX,HGATE-LX---------------------------------------------------------------------------------------------------0.3V~25V

LGATE,VCC------------------------------------------------------------------------------------------------------0.3V~25V

ISEN,KISEN,FSET,CF-----------------------------------------------------------------------------------------------0.3V~5.5V

FAULT------------------------------------------------------------------------------------------------------------0.3V~25V

PWM,EN------------------------------------------------------------------------------------------------------------0.3V~25V

PowerDissipation,PD@TA=25°CSOP16-----------------------------------------------------------------------------------2.5W

PackageThermalResistance(Note2)

θJA----------------------------------------------------------------------------------------------------------------40°C/W

θJC----------------------------------------------------------------------------------------------------------------20°C/W

JunctionTemperatureRange--------------------------------------------------------------------------------------40°Cto150°C

AmbientTemperatureRange-----------------------------------------------------------------------------------------------40°C~105°C

LeadTemperature(Soldering,10sec.)------------------------------------------------------------------------------------260°C

StorageTemperatureRange---------------------------------------------------------------------------------------65°Cto150°C

RecommendedOperatingConditions(Note3)

VIN,LX------------------------------------------------------------------------------------------------------------------33Vto92V

JunctionTemperatureRange--------------------------------------------------------------------------------------40°Cto125°C

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SY8759

ElectricalCharacteristics

(VVIN=35V,TA=25°Cunlessotherwisespecified)

ParameterSymbolTestConditionsMinTypMaxUnit

PowerSupplySection

InputVoltageRangeVIN3392V

InputUVLOThresholdVUVLO_RISE2629.532.9V

InputUVLOHysteresisVUVLO_HYS5.57.59.5V

VINCurrentLimitforVCCIVIN_LIMVVCC=0V101417.5mA

ENON,VVCC=10V100150200µA

VINQuiescentCurrentIQ_VIN

VEN=0V,VVCC=10V1220µA

ENON,VVCC=10V0.91.41.8mA

VCCQuiescentCurrentIQ_VCC

VEN=0V,VVCC=10V37µA

VCCVoltageReferenceVVCC_REF99.49.8V

VCCTurnonThresholdVVCC_ON88.69.2V

VCCTurnoffHysteresisVVCC_HYS1.45V

BSTTurnonThresholdVBST_ON4.55.256V

BSTTurnoffHysteresisVBST_HYS1.2V

ErrorAmplifierSection

VoltageSenseReferenceVREFV1.7641.81.836V

VREFI_100%DPWM=100%98100102mV

CurrentSenseReferenceVREFI_25%DPWM=25%24.52525.5mV

VREFI_0.25%DPWM=0.25%187.5250312.5µV

TOFF<TOFF,MAX2.545.5mV

ISENLowClampVISEN_LC

TOFF=TOFF,MAX6.58.29.5mV

ISENHighClampVISEN_HCVISEN,SP-50mV

ISENSleepVoltageVISEN_SP223250277mV

KISENAmplifierOffsetVKISEN_OS-2000200µV

ProgrammableFrequencySection

FrequencySetReferenceVREF_FSET1.822.2V

FrequencySetRangeFSW_RANGE20500kHz

Fsw=130khz,

FrequencyAccuracyF123.5130136.5kHz

SWVIN=48V

FSETCurrentLimitIFSET_LIM135185235µA

SRBuckGateDriverSection

GateDriverVoltageVGATELow/HighGateVVCCV

HighGateSourceResistorRSOURCE_H6.58.2510Ω

HighGateSinkResistorRSINK_H2.83.454.1Ω

LowGateSourceResistorRSOURCE_L6.98.610.3Ω

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SY8759

LowGateSinkResistorRSINK_L33.724.5Ω

HighGatetoLowGateDead

TGuaranteedbydesign50ns

TimeDT_HL

LowGatetoHighGateDead

TGuaranteedbydesign.50ns

TimeDT_LH

BuckMinimumoffTimeTOFF_MIN210292370ns

BuckMinimumonTimeTON_MIN110170230ns

BuckMaximumoffTimeTOFF_MAX430570710µs

BuckMaximumonTimeTON_MAX131925µs

CFSection

CFLinearDimmingRangeVCF_RANGE6.252500mV

PWM/ENDimmingFunction

ENTurnonThresholdVEN_ON1.71V

ENTurnoffThresholdVEN_OFF1.56V

PWMTurnonThresholdVDPWM_ON2.5V

PWMTurnoffThresholdVDPWM_OFF0.4V

PWMDimmingRangeDPWM_Dim0.25100%

FAULT/SLEEPFunction

FaultPulldownResistorRFAULT324252Ω

VSENFaultEnableVoltageVVSEN_FAULT405570mV

SleepProtectionTimeTSLEEP213039mS

PGNDEnableforISENShortVPGND_EN-33-48.5-63mV

ISENLatchRatioDPGND_RatioVSGND-PGND/VISEN-SGND6095130%

LXFaultVoltageVLX_FAULT1112.514V

ThermalSection

ThermalShutdown

T155°C

TemperatureSD

ThermalShutdown

T25°C

TemperatureHysteresisHYS

Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestress

ratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperational

sectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmay

affectdevicereliability.

Note2:θJAismeasuredinthenaturalconvectionatTA=25°Conaloweffectivesinglelayerthermalconductivitytest

boardofJEDEC51-3thermalmeasurementstandard.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.

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SY8759

Operation

Constant-currentandConstant-voltagecontrol

SY8759isahighefficiency,33V-92VwideinputTheaverageLEDcurrentregulationissetbyusinga

voltagerangesynchronous/non-synchronousstep-downsenseresistorinserieswiththeLEDs.

DC-DCconstantcurrentandconstantvoltagecontrollerV

I=REFI

targetingatprecisiondimmingLEDdriver.OUTR

ISEN

WhereRISENisthecurrentsenseresistor.

ThedeviceoperatesattheproprietarycontrolwithVout

constantoff-timearchitecturetoeasesthedesignofloopSY8759

compensationwhilemaintainingtheconvertertobeRVS,U

VSENCOMPV

operatedatnearlyconstantswitchingfrequency.GM

V

RREFV

VS,DCC/CV

LogicCOMP

ISEN

COMPI

ItadoptsproprietaryPWMdimminglogicandlowGM

VREFI

offseterroramplifiertoachieveextrawidedimmingRISEN

SGND

rangeof400:1analogdimmingandhighprecisionfor

allloadingrange.Fig.CC/CVControlBlock

SY8759providesreliablesingle-faultprotectionsforTheoutputvoltageisdetectedonVSENpinbyaresistor

safetyrequirementsuchasShortCircuitProtectiondivider.Tominimizethepowerconsumptionunderlight

(SCP),OpenLEDProtection(OLP),OverTemperatureloads,itisdesirabletochooselargeresistancevaluesfor

Protection(OTP),inductorshortedprotection,TopMOSbothRVS,UandRVS,D.

shortedprotectionandISENshortedprotection,etc.R

V=(1+)VVS,U

OUT,LIMREFVR

SY8759isavailablewithSOP16VS,D

Whentheovervoltageoperationoropencircuit

ApplicationsInformationoperationtakesplace,theoutputvoltagewillbelimited

atVOUT,LIM.

Constant-offtimearchitecture

ThedeviceoperatesatpeakcurrentcontrolwithDimmingmode

constantoff-timearchitecture,thedeviceseriesasenseSY8759supports400:1analogdimmingrangewith

resistorintheLEDpathtosensebothaverageLEDPWMsignalinput.

currentandpeakinductorcurrent.Thiscontroleasesthe

designofloopcompensationwhilemaintainingthePWMdimming

convertertobeoperatedatnearlyconstantswitching

AcapacitorCCFneedbeconnectedacrossCFandGND

frequency,pintoachievesoftstartandasmoothvoltagewaveform

ofthedimmingsignaldutycycle,thesoftstarttimecan

Frequencyvs.RFSETResistor:

beadjustedbyCCF.

12000

WhenPWMsignalishigherthanVDPWM,ON,the

Fs(kHz)=

R(k)FSETdimmingsignalissensedashighlogiclevel,andCFpin

Notice:Finalswitchfrequencyisnotonlyaffectedbyispulledupto2.5Vbya10kΩresistor;whenPWM

componenttolerantbutalsominimumofftimeandonsignalislowerthanVDPWM,OFF,thedimmingsignalis

timelimit.sensedaslowlogiclevel,andCFpinispulleddownto

GNDbya10kΩresistor.Thedutycycleofthedimming

SY8759signalDPWMisreflectedbythevoltageonCFpin.

SY8759

FSET2.5V

10kVREFI

PWM÷25

RFSET

SGNDCF

Fig.PWManalogdimming

Fig.FrequencySet

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SY8759

SocurrentsensereferenceandCFcanberepresentedby,high;ifVVSENishigherthanVVSEN,FAULT,VVSENispulled

downtozero.

Thewholestartupprocedureisdividedintofour

V=D2.5VCFPWM

sectionsshowninbelow.tST1istheCVINchargedup

V=V25

REFICFsection,tST2istheVCC/ENbuilt-upsection,tST3isCF

softstartsection,tST4isBucksteadystatesection.

Finally,thefullloadoutputcurrentcanberepresentedVVIN

by,VUVLO,VIN

t

VREFI,100%VVCC

VVCC,ON

IOUT=DPWM

RISEN

t

WhereVREFI_100%iscurrentreference@PWM=100%VEN

IOUT

t

100%

VPWM

t

VFAULT

t

VCF

0.2%

0%t

PWMDuty

0.2%(Stablevalue)100%VVSEN

Fig.AnalogdimmingcurveVVSEN,FAULT

t