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HT7L5610 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc

No. de Pieza. HT7L5610
Descripción  Primary Side Regulation Off Line LED Driver with Active PFC
Descarga  9 Pages
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Fabricante  HOLTEK [Holtek Semiconductor Inc]
Página de inicio  http://www.holtek.com
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HT7L5610 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc

   
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Rev. 1.00
6
September 08, 2015
HT7L5610
LED Open Protection – ZCD OVP
TheZCDpinvoltageissetbyaresistordivider,
RTOP(topresistor)andRBOT(bottomresistor),and
anauxiliarywindingduetothecouplingpolarity
betweentheauxiliarywindingandthesecondary
windingofthetransformer.OncetheZCDvoltage
exceeds3.2Vafterablankingtimeabout1µstoallow
theleakageinductanceringingtobefullydamped,
theZCDOVPistriggeredandtheICstopsswitching.
Itcanberesetbyre-startingthevoltageonVCCpin.
TheOVPvoltagecanbeadjustedusingthefollowing
equation:
D
A
S
BOT
TOP
OVP
OUT
V
N
N
R
R
V
+
×
+
×
=
)
1
(
2
.
3
_
WhereNSissecondarywinding,NAistheauxiliary
winding,VD is the forward bias voltage of the
secondarydiode.
OCP – Over Current Protection
The device includes an over current protection
functionontheCSpin.Aninternalcircuitdetectsthe
currentlevelandwhenthecurrentislargerthanthe
overcurrentprotectionthresholdlevel,VOCP/RCS,the
gateoutputwillremainatalowlevel.
LED Short Protection – SCP
TheoutputvoltagedropswhenanumberofLEDs
inastringareshortedresultinginavoltagedropat
VCC.OncetheVCCdropsbelow7.5V,thedevice
willstopoperating.Undersuchsituations,thestart-up
operationwillrechargetheVCCpinthroughthestart-
upresistorandthedevicewillentertheUVLOhiccup
mode.
Thermal Protection
Athermalprotectionfeatureisincludedtoprotect
thedevicefromexcessiveheatdamage.Whenthe
junctiontemperatureexceedsathresholdof150°C,
thethermalprotectionfunctionwillturnoffthedrain
sourceterminalterminalimmediately.WhentheVCC
decreasesbelowtheUVLOofflevel,thecontroller
willreset.


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