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HT7L4091 Datasheet(PDF) 13 Page - Holtek Semiconductor Inc

Part # HT7L4091
Description  Universal Step-Down PWM Control For High Brightness LED Lighting Control
PDF  17 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7L4091 Datasheet(HTML) 13 Page - Holtek Semiconductor Inc

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Rev. 1.20
13
March 12, 2013
HT7L4091
High Efficiency Circuit
Tr
D1
Rs
MOSFET
GDR
CS
GND
RT
LD
VDD
PDM
C7
Rg
R
sb
Dg
Rc
Cc
Ra
Da
VIN
RIN
AC
EMI
Lc
Lc
Ca1
Ca2
VLED
Cfilter
C1
0.1uF
400V
22uF
400V
Essential components
Used optional components
Unused optional components
CIN
1uF/50V
Zin
RT
CT
5pF
Theapplicationcircuitusestheauxiliaryinductortosupplythedevicepowertoobtainbetterefficiency.
IffrequencyjitteringisusedtoreduceEMIinterferenceeffects,anoptional5pFcapacitormaybeusedfor
stabilisationpurposes.Formoredetails,refertotheapplicationnoteforauxiliaryinductorapplications.
Formoredetailsreferttotheapplicationnote.
BJT Power Supply Application Circuit
TheapplicationcircuitusesaBJTtosupplythedevicepowertoobtainbetterefficiency.
Zin
CIN
RIN
BJT
Cfilter
GDR
CS
VIN
GND
RT
LD
VDD
PDM
C7
AC
EMI
Lc
Lc
Ca1
Ca2
C1
0.1uF
400V
1uF
50V
0.1uF
L
D1
VLED
Co
MOSFET
R
cs
CC
Rc
RT
CT
5pF
22uF
400V
IffrequencyjitteringisconsideredtoreduceEMIanoptional5pFCTmaybeusedtostabilisetheeffect.
Formoredetailsrefertotheapplicationnote.



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