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HT7A6005 데이터시트(PDF) 5 Page - Holtek Semiconductor Inc

부품명 HT7A6005
상세설명  Low Power, Wide Temperature Range General Purpose Current Mode PWM Controller
PDF  11 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7A6005 데이터시트(HTML) 5 Page - Holtek Semiconductor Inc

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Rev. 1.10
5
July 17, 2013
HT7A6005
Application Information
Operation Overview
TheHT7A6005isalowpower,widetemperature
rangegeneralpurposecurrentmodePWMController.
Thedeviceisdesignedtorequireaminimumof
external components for different power circuit
topologiessuchasPrimary-SideFeedbackFlyback
andDC-DCBuck/Boost.Thedevicecanbeusedfor
LEDdrivingapplicationssuchasLEDbacklights
andLEDlighting.TomeetLEDconstantcurrent
requirements,thedevicecanmaintainalowcurrent
toleranceof±1%forLEDdrivingapplications.
Under Voltage Lockout (UVLO)
AUVLOcomparatorisprovidedtoensurethatthe
deviceisfullyfunctionalbeforetheoutputstageis
enabled.AsshowninFigure5,hysteresisisprovided
topreventthePWMControllerfromshuttingdown
duringanyvoltagedipswhichmightoccurduringthe
startupprocess.Theturn-onandturn-offthreshold
levelsaresetat8.4Vand7.6V,respectively.
Figure 5. UVLO Scheme and Start-Up Current
Current Sense and Leading-Edge
Blanking (LEB)
For Isolation Flyback applications, a Leading-
EdgeBlankingSchemeisnecessary.ALeading-
EdgeBlankingSchemeisintegratedinthedeviceto
preventfalsetriggeringduetofeedbackcurrentspikes
whichmayappearontheCSpin.Thiseliminates
theneedfortheusualR-Cfilterwhichisnormallya
requirementintypicalcurrentmodePWMController
applications.
HT7A6005
350ns
Blank Time
removed
RT
GD
GND
CS
VREF
0.1uF
10K
Figure 6. LEB with R-C Filter Removed
Internal Slope-Compensation
An important issue with current mode control
schemesisinstabilityduetosub-harmonicoscillation
whentheDuty-Cycle>50%.Topreventthisproblem
from occurring,a Slope-Compensationfunction
isalwaysnecessary.Intraditionalcurrentmode
controllerapplications,manyexternalcomponents
arenecessarytoimplementaSlope-Compensation
function.HoweverintheHT7A6005theinternal
Slope-Compensationfunctioneliminatestheneedfor
theseexternalcomponentsresultinginasimplified
applicationcircuitdesign.
Oscillator Frequency Tuning
Bychoosinganappropriatevalueofexternalresistor
betweentheRTPinandGND,asuitableoperating
frequencycanbegenerated.Therelationshipbetween
theRTvalueandtheoperatingfrequencyisprovided
inFigure7.
Figure 7. RT Resistor Value vs. Operating Frequency



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