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| Design Idea DI-133 LinkSwitch-XT Application Induction Cooktop Device LNK364P (R) Non-isolated Induction Cooktop Auxiliary Supply Power Output 5.9 W Input Voltage 185-265 VAC Output Voltage 5 V, 100 mA / 18 V, 300 mA Topology Flyback Design Highlights * * * * Lowcost,lowcomponentcountsolution:only17parts Bothoutputsexhibitgoodcrossregulation <130mWno-loadpowerconsumptionat265VAC MeetsCECactivemodeefficiencywithgoodmargin Ahigh-voltagecurrentsourcewithinU1feedscurrentinto bypasscapacitorC3,duringtheMOSFEToff-time.Capacitor C3developstheoperatingvoltagefortheICandsupplies thenormaloperatingcurrenttothechip. DuetothephasingofT1'swindingsandthelocationsand orientationsoftheoutputdiodes(D4andD5),nosecondary currentflowswhiletheMOSFETisonandcurrentisflowing through the primary winding of T1. Once the integrated controllerwithinU1switchesofftheMOSFET,thevoltages acrossthewindingsofT1reverse,D4andD5areforward biased, and secondary winding current flows into output capacitorsC4andC5. Resistor divider R3 and R4 sense the 5 V output. The controllerwithinU1usesthecurrentintotheFEEDBACK (FB) pin to control MOSFET switching and regulate the 5Voutput.Theturnsratiobetweenthe5Vandthe18V windingsprovidesadequateregulationofthe18Voutput. AnLCpostfilter(L1andC6)onthe5Voutputattenuates theswitchingrippleto<100mVpk-pk. Operation Thenon-isolatedflybackconvertershowninFigure1was designedaroundamemberoftheLinkSwitch-XTICfamily, theLNK364P(U1).Itsdualoutputs(5Vforthedisplayand 18VforthefanandIGBTcontrolcircuit)canprovideupto 5.9Wofpoweratthelowestinputlinevoltage(185VAC). SincethecooktophasconductedEMIfilteringfortheinduction heatingconverter,thisauxiliarysupplyrequiresnofuseor filtercomponents.DiodeD1half-waverectifiestheACinput andcapacitorC1filtersittoproducethehigh-voltageDCbus thatfeedstransformerT1.AnRCDclamp(C2,D3,R1and R2)acrosstheprimarywindingofT1limitstheamplitudeof theleakage-inductancevoltagespikethatoccurseachtimethe integratedpowerMOSFETwithinU1switchesoff. L D1 1N4007 R1 120 k C2 1 nF 1 kV 3 6 7 2 T1 8 +18 V, 300 mA D4 UF4002 C4 100 F 25 V L1 6.8 H C6 100 F 10 V +5 V, 100 mA R2 100 D3 1N4007 185-265 VAC C1 4.7 F 400 V 5 EE16 C5 100 F 10 V D5 UF4002 RTN D LinkSwitch-XT U1 FB LNK364P BP R4 16 k 1/8 W S N C3 100 nF 50 V R3 10 k 1/8 W Figure 1. LinkSwitch-XT, 5.9 W Induction Cooktop, Auxiliary Power Supply. DI-133 PI-4573-020907 February 2007 DI-89 DI-133 Key Design Points * SelectthevaluesofR3andR4sothatwhenthe 5Voutputisinregulation,thereis1.63VontheFB pin,withacurrentof49mAflowingintotheFBpin. HigherohmicvaluesforR3andR4willnotimprove efficiencyandmaydegraderegulationaccuracy. * FeedbackresistorR4mustbeconnectedbeforethe LCpost(L1andC6)filterinordertoavoidgroups ofenabledanddisabledswitchingcyclesfrom occurring. Loading 100% on 5 V and 100% on 18 V 100% on 5 V and 10% on 18 V 10% on 5 V and 100% on 18 V 10% on 5 V and 10% on 18 V 185 205 225 245 265 * WindT1forthelowestleakageinductancebychoosing wiregaugesizesthatcompletelyfilleachwindinglayer. * ThePIXlsspreadsheettoolcanbeusedtomodifythis supplytoallowoperationovertheuniversalACinput voltagerange(85-265VAC). PI-4583-021407 130 No-Load Input Power (mW) 120 110 100 90 80 70 5 V Output 4.94 5.01 5.08 5.14 18 V Output 18.14 19.46 17.99 18.51 Input Voltage (VAC) Table 1. Output Cross Regulation at 265 VAC. Figure 2. No-Load Input Power vs. Line Voltage. PI-4584-021407 73 TRANSFORMER PARAMETERS EE16 Core Material NC-2H or Equivalent, gapped for ALG of 63 nH/t2 Bobbin EE16, 8 pin Primary: 200T, 36 AWG, tape Secondary 5 V:, 11T, 29 AWG Winding Details triple insulated, tape Secondary 18 V: 26T, 30 AWG triple insulated, tape Primary Inductance 2.77 mH 10% 500 kHz (minimum) 111 mH (maximum) Efficiency (%) 72 Full Load 71 70 185 205 225 245 265 Input Voltage (V) Primary Resonant Frequency Leakage Inductance Figure 3. Efficiency vs. Input Voltage at Full Load. For the latest updates, visit www.powerint.com Table 2. Transformer Construction Information. Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein. POWER INTEGRATIONS MAKES NO WARRANTY HEREIN AND SPECIFICALLY DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS. The products and applications illustrated herein (transformer construction and circuits external to the products) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations' patents may be found at www.powerint.com. Power Integrations grants its customers a license under certain patent rights as set forth at http://www.powerint.com/ip.htm. The PI logo,TOPSwitch, TinySwitch,LinkSwitch, DPA-Switch,PeakSwitch,EcoSmart, Clampless,E-Shield,Filterfuse,StackFET,PI ExpertandPI FACTS are trademarks of Power Integrations, Inc. Other trademarks are property of their respective companies. (c)2007, Power Integrations, Inc. Rev. A 02/07 Power Integrations 5245 Hellyer Avenue San Jose, CA 95138 Phone: 1-408-414-9200 Apps: 1-408-414-9660 Apps Fax: 1-408-414-9760 For a complete listing of worldwide sales offices, please visit www.powerint.com |
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