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DI-133 PDF预览

DI-133

更新时间: 2022-04-23 23:00:11
品牌 Logo 应用领域
帕沃英蒂格盛 - POWERINT /
页数 文件大小 规格书
2页 320K
描述
Non-isolated Induction Cooktop Auxiliary Supply

DI-133 数据手册

 浏览型号DI-133的Datasheet PDF文件第2页 
Design Idea DI-133  
LinkSwitch®-XT  
Non-isolated Induction Cooktop Auxiliary Supply  
Application  
Device  
Power Output Input Voltage  
5.9 W 185-265 VAC  
Output Voltage  
Topology  
Induction Cooktop LNK364P  
5 V, 100 mA / 18 V, 300 mA  
Flyback  
Design Highlights  
Aꢀhigh-voltageꢀcurrentꢀsourceꢀwithinꢀU1ꢀfeedsꢀcurrentꢀintoꢀ  
bypasscapacitorC3,duringtheMOSFEToff-time.Capacitorꢀ  
C3ꢀdevelopsꢀtheꢀoperatingꢀvoltageꢀforꢀtheꢀICꢀandꢀsuppliesꢀ  
theꢀnormalꢀoperatingꢀcurrentꢀtoꢀtheꢀchip.  
•ꢀ Lowꢀcost,ꢀlowꢀcomponentꢀcountꢀsolution:ꢀonlyꢀ17ꢀparts  
•ꢀ Bothꢀoutputsꢀexhibitꢀgoodꢀcrossꢀregulation  
•ꢀ <130ꢀmWꢀno-loadꢀpowerꢀconsumptionꢀatꢀ265ꢀVAC  
•ꢀ MeetsꢀCECꢀactiveꢀmodeꢀefficiencyꢀwithꢀgoodꢀmargin  
DueꢀtoꢀtheꢀphasingꢀofꢀT1’sꢀwindingsꢀandꢀtheꢀlocationsꢀandꢀ  
orientationsꢀofꢀtheꢀoutputꢀdiodesꢀ(D4ꢀandꢀD5),ꢀnoꢀsecondaryꢀ  
currentꢀflowsꢀwhileꢀtheꢀMOSFETꢀisꢀonꢀandꢀcurrentꢀisꢀflowingꢀ  
throughtheprimarywindingofT1.Oncetheintegratedꢀ  
controllerꢀwithinꢀU1ꢀswitchesꢀoffꢀtheꢀMOSFET,ꢀtheꢀvoltagesꢀ  
acrossꢀtheꢀwindingsꢀofꢀT1ꢀreverse,ꢀD4ꢀandꢀD5ꢀareꢀforwardꢀ  
biased,ꢀ andꢀ secondaryꢀ windingꢀ currentꢀ flowsꢀ intoꢀ outputꢀ  
capacitorsꢀC4ꢀandꢀC5.  
Operation  
Theꢀnon-isolatedꢀflybackꢀconverterꢀshownꢀinꢀFigureꢀ1ꢀwasꢀ  
designedꢀaroundꢀaꢀmemberꢀofꢀtheꢀLinkSwitch-XTꢀICꢀfamily,ꢀ  
theꢀLNK364Pꢀ(U1).ꢀꢀItsꢀdualꢀoutputsꢀ(5ꢀVꢀforꢀtheꢀdisplayꢀandꢀ  
18ꢀVꢀforꢀtheꢀfanꢀandꢀIGBTꢀcontrolꢀcircuit)ꢀcanꢀprovideꢀupꢀtoꢀ  
5.9ꢀWꢀofꢀpowerꢀatꢀtheꢀlowestꢀinputꢀlineꢀvoltageꢀ(185ꢀVAC).  
Resistorꢀ dividerꢀ R3ꢀ andꢀ R4ꢀ senseꢀ theꢀ 5ꢀ Vꢀ output.ꢀ ꢀ Theꢀ  
controllerꢀwithinꢀU1ꢀusesꢀtheꢀcurrentꢀintoꢀtheꢀFEEDBACKꢀ  
(FB)pintocontrolMOSFETswitchingandregulatetheꢀ  
5ꢀVꢀoutput.ꢀꢀTheꢀturnsꢀratioꢀbetweenꢀtheꢀ5ꢀVꢀandꢀtheꢀ18ꢀVꢀ  
windingsꢀprovidesꢀadequateꢀregulationꢀofꢀtheꢀ18ꢀVꢀoutput.ꢀ  
AnꢀLCꢀpostꢀfilterꢀ(L1ꢀandꢀC6)ꢀonꢀtheꢀ5ꢀVꢀoutputꢀattenuatesꢀ  
theꢀswitchingꢀrippleꢀtoꢀ<100ꢀmVꢀpk-pk.  
SincethecooktophasconductedEMIlteringfortheinductionꢀ  
heatingꢀconverter,ꢀthisꢀauxiliaryꢀsupplyꢀrequiresꢀnoꢀfuseꢀorꢀ  
filtercomponents.ꢀDiodeꢀD1ꢀhalf-waveꢀrectifiesꢀtheACꢀinputꢀ  
andꢀcapacitorꢀC1ꢀfiltersꢀitꢀtoꢀproduceꢀtheꢀhigh-voltageꢀDCꢀbusꢀ  
thatꢀfeedsꢀtransformerꢀT1.ꢀꢀAnꢀRCDꢀclampꢀ(C2,ꢀD3,ꢀR1ꢀandꢀ  
R2)ꢀacrossꢀtheꢀprimaryꢀwindingꢀofꢀT1ꢀlimitsꢀtheꢀamplitudeꢀofꢀ  
theleakage-inductancevoltagespikethatoccurseachtimetheꢀ  
integratedꢀpowerꢀMOSFETꢀwithinꢀU1ꢀswitchesꢀoff.  
T1  
L
+18 V, 300 mA  
2
8
C2  
1 nF  
1 kV  
D1  
1N4007  
D4  
UF4002  
R1  
120 kΩ  
C4  
100 µF  
25 V  
L1  
3
6
7
6.8 µH  
+5 V, 100 mA  
RTN  
R2  
100 Ω  
C5  
C6  
100 µF  
10 V  
100 µF  
10 V  
5
D3  
1N4007  
C1  
4.7 µF  
400 V  
185-265  
VAC  
EE16  
D5  
UF4002  
R4  
16 kΩ  
1/8 W  
LinkSwitch-XT  
U1  
D
LNK364P  
FB  
BP  
R3  
S
10 kΩ  
C3  
100 nF  
50 V  
1/8 W  
N
PI-4573-020907  
Figure 1. LinkSwitch-XT, 5.9 W Induction Cooktop, Auxiliary Power Supply.  
February 2007  
DI-133  

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