{"text_format":"1","workbook":"xlsx","n_sheets":4,"sheets":["Main Table","Buck_Cal","thermal foldback","frequency setting"],"not_rendered":{"charts":2,"images":5,"macros":1,"external_links":1,"defined_names":105,"comments":0,"pivot_tables":0},"unopened":[],"bounds":{"document_bytes":16777216,"sheet_cells":100000,"rows_first":2000,"rows_last":500,"rows_between":2000,"halvings":0,"cell_chars":16384,"cell_head_chars":4096},"cells_cut":0,"cells_raw":0,"read":"whole","date_system":"1900"}

{"sheet":"Main Table","index":0,"n_rows":41,"n_cols":6,"rows_kept":41,"cut":false,"hidden":false,"merged":[]}
[]
["User Input"]
["Calculated"]
["Constant"]
[null,null,null,null,null,"Comment"]
[null,"Input voltage","Vin",48,"V"]
[null,"Max current per channel","Iout_Full Scale/string",320,"mA"]
[null,"channel count",null,1]
[null,"Max output current","Iout_Full Scale total",{"$f":"D8*D7","v":320},"mA"]
[null,"PWM dimming duty","Dpwm",1]
[null,"Analog dimming duty","Dadim",1]
[null,"Actual output current","Iout",{"$f":"D10*D11*D9","v":320},"mA"]
[null,"LED number #","LED count/string",5]
[null," LED forward voltage","LED Vf",3.54,"V"]
[null,"Total LED Voltage","Vled",{"$f":"D14*D13","v":17.7},"V"]
[null,"Diode forward voltage","VD",0.74,"V"]
[null,"Switching frequency","Fsw",1,"MHz"]
[null,"switching frequency resistor","RFET",{"$f":"'frequency setting'!F20","v":21},"kΩ"]
[null,"Suggested power Inductor","L",{"$f":"IF(D17<1, 22,10)","v":10},"uH"]
[null,"Actual power Inductor","Lact",22,"uH"]
[null,"Actual power Inductor ESR","RL",1.2330000000000001E-2,"Ω"]
[null,"Inductor peak current","IL_peak",{"$f":"IF(ff>=0,Ipeak_ccm,Buck_Cal!Ipeak)","v":0.58723758268135673},"A"]
[null,"Inductor ripple current","IL_rip_pp",{"$f":"IF(ff>=0,Buck_Cal!Ipp,Buck_Cal!Ipeak)","v":0.53447516536271344},"A"]
[null,"recommended inductor saturation current","IL_sat",{"$f":"(D22+D23/2)*1.5","v":1.28171274804407},"A"]
[null,"Sense resistor","Rse",{"$f":"1000*1000*0.2/D12","v":625},"mΩ"]
[null,"Actual sense resistor","Rse_actual",625,"mΩ"]
[null,"Power rating of sense resistor min.",null,{"$f":"Buck_Cal!M12","v":7.8878317832786454E-2},"W"]
[null,"UVP upper resistor","Rup1",50,"kΩ"]
[null,"UVP lower resistor","Rup2",40,"kΩ"]
[null,"UVP verification",null,{"$f":"IF((D6-D15)*(D29/(D29+D28))>1.2*(1+5%), \"PASS\", \"FAIL\")","v":"PASS"}]
[null,"Device package",null,"VSON"]
[null,"Device power loss","Ploss",{"$f":"Buck_Cal!M15","v":0.80973079855004926},"W"]
[null,"Device thermal rise","Trise",{"$f":"Buck_Cal!M16","v":24.291923956501478},"deg"]
[null,"Thermal foldback","Ttemp",105,"deg","TI recommended at least 25deg margin"]
[null,"Thermal foldback","Rtemp",{"$f":"'thermal foldback'!Z5","v":46.144232300006479},"kΩ"]
[null,"Efficiency","η",{"$f":"Buck_Cal!M20","v":0.82201351185376215},null,"system efficiency"]
[null,"Input capacitance","Cin",15,"uF","TI recommended at least 15uF MLCC"]
[null,"Output caps","Cout",5,"uF"]
[null,"Output caps ESR","ESR",0.01,"W"]
[null,"desired output ripple","Vrip_d",0.1,"V"]
[null,"calculated output ripple","Vrip_c",{"$f":"IF(ff>=0,Buck_Cal!E12,Buck_Cal!J12)","v":1.4743678335223385E-2},"V","calculated output ripple shuold be smaller than desired output ripple"]

{"sheet":"Buck_Cal","index":1,"n_rows":46,"n_cols":33,"rows_kept":46,"cut":false,"hidden":true,"merged":[[10,3,10,6]]}
[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"Mos Off time"]
[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,2.0599999999999999E-8]
[null,null,"Ambient temperature","VIN (V)","VO (V)","RL (Ω)","RDS(ON)","Rsense","RD (Ω)","VD (V)","ILOAD (A)","L (H)","FS (Hz)","Vhead(V)","TS","Mode","θJA_EVM","MOS On time(s)","θBA","Cout(F)","ESR"]
[null,null,25,{"$f":"'Main Table'!D6","v":48},{"$f":"'Main Table'!D15","v":17.7},{"$f":"'Main Table'!D21","v":1.2330000000000001E-2},0.15,{"$f":"'Main Table'!D26/1000","v":0.625},0.01,{"$f":"'Main Table'!D16","v":0.74},{"$f":"'Main Table'!D12/1000","v":0.32},{"$f":"'Main Table'!D20*0.000001","v":2.1999999999999999E-5},{"$f":"'Main Table'!D17*1000000","v":1000000},0,{"$f":"1/FS","v":9.9999999999999995E-7},{"$f":"IF(Ivalley>=0,\"CCM\",\"DCM\")","v":"CCM"},{"$f":"IF('Main Table'!D31=\"VSON\",30,IF('Main Table'!D31=\"WSON\",47.4, 154))","v":30},2.4599999999999999E-8,null,4.6999999999999999E-6,0.01,null,"CCM"]
[null,null,null,null,null,null,null,null,null,null,null,"Thermal-MOS-(Dynamic) (W)",{"$f":"IF(Ivalley>=0, 0.5*(VIN+VD)*Ivalley*FS*MOS_On_time+0.5*(VIN+VD)*Ipeak_ccm*FS*Mos_Off_time,0.5*(VIN+VD)*Ipeak*FS*Mos_Off_time)","v":0.32643736044022131},null,null,null,null,null,null,null,null,null,"IL","Iin","D","Ipp","Ivalley","I_LRMS","MOS Dyn Loss","MOS Const","Diode loss","Inductor loss","Rsense loss"]
["Vin max",65,null,"D",{"$f":"Y26","v":0.38806777683101296},null,null,null,"D1",{"$f":"X46","v":0.42095943347824155},null,"Thermal-MOS-(Constant) (W)",{"$f":"IF(Ivalley>=0,(ILOAD^2+Ipp^2/12)*RDS_ON*D_ccm,(ILOAD^2+Ipeak^2/12)*RDS_ON*D1_)","v":7.3464320259694748E-3},null,"Interval","t","t","Current",null,null,null,1,{"$f":"ILOAD","v":0.32},{"$f":"ILOAD*(VO+VD)/(VIN+VD)","v":0.12106688551497741},{"$f":"X6/ILOAD","v":0.37833401723430438},{"$f":"(VIN-VO)*Y6/L/FS","v":0.5210691237363374},{"$f":"IF(W6-Z6/2>0, W6-Z6/2,0)","v":5.9465438131831305E-2},{"$f":"ILOAD*(1+(Z6^2/ILOAD^2)/12)^0.5","v":0.3535902798097626},{"$f":"(VIN+VD)*AA6*FS*R$4","v":7.1299298181818266E-2},{"$f":"AB6^2*RDS_ON*(Y6)","v":7.0952432049541866E-3},{"$f":"(AB6*AB6*RD+VD*W6)*(1-Y6)","v":0.14798774936501258},{"$f":"RL*AB6^2","v":1.5415716400834167E-3},{"$f":"$H$4*AB6^2","v":7.8141303734966375E-2}]
["D @max delQ",0.5,null,"IL",{"$f":"W15","v":0.32},null,null,null,"ILD",{"$f":"U46","v":0.32},null,"Thermal-MOS-(Cap loss) (W)",{"$f":"(LowSide_Cgs*VIN^2+0.5*LowSide_Cds*VIN^2+LowSide_Cgd*(VIN+VO)*VO)*FS/1000000000000","v":0.37994700608385851},null,0,{"$f":"O7*TS","v":0},{"$f":"P7*1000000","v":0},{"$f":"IF(Ivalley>=0,Ivalley,0)","v":5.2762417318643284E-2},null,null,null,2,0.32,{"$f":"(VO*ILOAD+AC6+AD6+AE6+AF6+AG6)/VIN","v":0.12437635762764239},0.38867611758638249,0.53531301649397223,{"$f":"IF(W7-Z7/2>0, W7-Z7/2,0)","v":5.2343491753013893E-2},0.35535897643883474,6.2760055985830676E-2,{"$f":"AB7^2*RDS_ON*(Y7)","v":7.3623031438330459E-3},0.14553347516731235,1.5570324263326422E-3,{"$f":"$H$4*AB7^2","v":7.892500133478518E-2}]
["Iomax",4,null,"D`",{"$f":"1-D_ccm","v":0.61193222316898699},null,null,null,"D2",{"$f":"Z46","v":0.69170666130101532},null,"Thermal-Diode-(conduction)(W)",{"$f":"IF(Ivalley>=0,ILOAD^2*(1+(Ipp^2/ILOAD^2)/12)*RD*D+VD*ILOAD*D,ILOAD^2*(1+(Ipeak^2/ILOAD^2)/12)*RD*D2_+VD*ILOAD*D2_)","v":0.14567784139667608},null,{"$f":"IF(Ivalley>=0,Dbar,D1_)","v":0.38806777683101296},3.8806777683101295E-7,{"$f":"P8*1000000","v":0.38806777683101296},{"$f":"IF(Ivalley>=0,Ivalley+Ipp,Ipeak)","v":0.58723758268135673},null,null,null,3,0.32,0.12416953891787696,0.38802980911836549,0.53442287346756701,{"$f":"IF(W8-Z8/2>0, W8-Z8/2,0)","v":5.2788563266216504E-2},0.35524730912484648,6.3293698510446653E-2,7.3454421567937652E-3,0.14568685156338926,1.5560540223966773E-3,7.8875406650277646E-2]
["required Vin_rip",{"$f":"B6*0.01","v":0.65},null,"Ipp",{"$f":"(VIN-VO)*Dbar/L/FS","v":0.53447516536271344},"Irms",{"$f":"AB26","v":0.35525386490854444},null,"Ipeak",{"$f":"Y46","v":0.57977594701776003},null,"Thermal-Diode-(cap loss)(W)",{"$f":"Cdiode*VIN^2*FS/1000000000000","v":0.18432000000000001},null,{"$f":"IF(Ivalley>=0,1,D1_+D2_)","v":1},9.9999999999999995E-7,1,{"$f":"IF(Ivalley>=0,Ivalley,0)","v":5.2762417318643284E-2},null,null,null,4,0.32,0.12418244693548551,0.38807014667339224,0.5344784292819903,5.2760785359004858E-2,0.35525427412016491,6.3260392688588254E-2,7.3464938135765073E-3,0.14567727900630875,1.5561150391303566E-3,7.8878499550403297E-2]
["fsw_min",100000,null,"Ivalley",{"$f":"IL-Ipp/2","v":5.2762417318643284E-2},"Ipeak",{"$f":"IL+Ipp/2","v":0.58723758268135673},null,"D3",{"$f":"1-D1_-D2_","v":-0.11266609477925693},null,"Thermal-Inductor-(conduction)(W)",{"$f":"IF(Ivalley>=0,ILOAD^2*(1+(Ipp^2/ILOAD^2)/12)*RL,ILOAD^2*(1+(Ipeak^2/ILOAD^2)/12)*RL)","v":1.5561114542052112E-3},null,1,9.9999999999999995E-7,1,{"$f":"IF(Ivalley>=0, Ivalley,0)","v":5.2762417318643284E-2},null,null,null,5,0.32,0.1241816412520418,0.38806762891263064,0.53447496163875952,5.2762519180620249E-2,0.35525383936686189,6.3262471547640392E-2,7.3464281693844981E-3,0.14567787649937908,1.5561112304457692E-3,7.8878306490560074E-2]
["Vo_max",60,null,"CCM",null,null,null,null,"DCM",null,null,"Thermal-Inductor-(AC loss)(W)",{"$f":"18.1*10^(-6)*FS^1.155*(0.06374*IF(Ivalley>=0,Ipeak_ccm,Ipeak))^2.378/10","v":6.2346168418329611E-3},null,{"$f":"IF(Ivalley>=0,1+Dbar,1+D1_)","v":1.388067776831013},1.3880677768310129E-6,1.388067776831013,{"$f":"IF(Ivalley>=0, Ivalley+Ipp,Ipeak)","v":0.58723758268135673},null,null,null,6,0.32,0.1241816915403627,0.3880677860636334,0.53447517807854972,5.2762410960725148E-2,0.35525386650277968,6.3262341791553295E-2,7.3464322666859502E-3,0.14567783920567096,1.5561114681716056E-3,7.8878318540734266E-2]
[null,null,null,"Ripple_pp",{"$f":"Ipp/(8*FS*T4)+Ipp*U4^2*T4*FS/(2*Dbar*D)","v":1.4743678335223385E-2},null,null,null,"Ripple_pp",{"$f":"(0.5*ILOAD^2*D1_*TS/Ipeak+0.5*ILOAD*(Ipeak-ILOAD)*D2_*TS/Ipeak+ILOAD*TS*J10)/T4+Ipeak*U4","v":1.6587171017426072E-2},null,"Thermal-RSENSE(W)",{"$f":"IF(Ivalley>=0,ILOAD^2*(1+(Ipp^2/ILOAD^2)/12)*Rsense,ILOAD^2*(1+(Ipeak^2/ILOAD^2)/12)*Rsense)","v":7.8878317832786454E-2},null,{"$f":"IF(Ivalley>=0,2,1+D1_+D2_)","v":2},1.9999999999999999E-6,2,{"$f":"IF(Ivalley>=0, Ivalley,0)","v":5.2762417318643284E-2},null,null,null,7,0.32,0.124181688401517,0.38806777625474059,0.5344751645690291,5.2762417715485455E-2,0.35525386480903703,6.3262349890537917E-2,7.3464320109446783E-3,0.14567784153343202,1.5561114533334708E-3,7.8878317788598482E-2]
["CCM",null,null,null,null,null,null,null,null,null,null,"Thermal-Headroom(W)",{"$f":"ILOAD*Vhead_V","v":0},null,2,1.9999999999999999E-6,2,{"$f":"IF(Ivalley>=0, Ivalley,0)","v":5.2762417318643284E-2},null,null,null,8,0.32,0.12418168859743429,0.38806777686698218,0.53447516541225282,5.2762417293873598E-2,0.35525386491475536,6.326234938502362E-2,7.3464320269072793E-3,0.14567784138814019,1.5561114542596228E-3,7.887831783554454E-2]
["Cin_mlcc",{"$f":"B7*(1-B7)*B8/(B10*B9)","v":1.5384615384615384E-5},null,null,null,null,null,null,null,null,null,"Quiescent loss (W)",{"$f":"Quiescent_current*VIN/1000","v":9.6000000000000002E-2},null,null,null,null,null,null,null,null,9,0.32,0.12418168858520574,0.38806777682876792,0.53447516535962125,5.2762417320189381E-2,0.3552538649081568,6.3262349416576352E-2,7.3464320259109444E-3,0.14567784139720885,1.5561114542018155E-3,7.8878317832614328E-2]
["Icin_rms_max",{"$f":"B8*(B7*(1-B7)+(1/12)*(B11/(L*B10*B8))^2*(1-B7)^2*B7)^0.5","v":3.4275259130016105},{"$f":"(B7*((1-B7)*B8^2+Ipeak^2/12))^0.5","v":2.003498400181754},"Diode ESC","Cdiode",80,"pF",null,null,null,null,"Total device loss(W)",{"$f":"SUM(M5:M7)+M14","v":0.80973079855004926},null,"VIN: ","Input Voltage of Buck",null,null,null,null,null,10,0.32,0.12418168858596901,0.38806777683115312,0.5344751653629064,5.2762417318546806E-2,0.35525386490856858,6.32623494146069E-2,7.346432025973129E-3,0.14567784139664283,1.5561114542054231E-3,7.8878317832797182E-2]
[null,null,null,"Low side switching Cgs","LowSide Cgs",{"$f":"90/RDS_ON/5","v":120},"pF",null,null,null,null,"Thermal rise (deg)",{"$f":"M15*Q4","v":24.291923956501478},null,"VO:","Output Voltage of Buck",null,null,null,null,null,null,0.32,0.12418168858592137,0.38806777683100424,0.53447516536270123,5.2762417318649391E-2,0.35525386490854288,6.3262349414729899E-2,7.3464320259692467E-3,0.14567784139667816,1.5561114542051978E-3,7.8878317832785774E-2]
["transient",null,null,"Low side switching Cgd","LowSide Cgd",{"$f":"190/RDS_ON/SQRT((60+5)*5)","v":70.262024855195691},"pF",null,null,null,null,"Estimated device temperature(deg)",{"$f":"M16+C4","v":49.291923956501478},null,"RL:","Inductor DC resistance",null,null,null,null,null,null,0.32,0.12418168858592431,0.38806777683101346,0.534475165362714,5.2762417318643007E-2,0.35525386490854444,6.3262349414722238E-2,7.3464320259694852E-3,0.14567784139667597,1.5561114542052114E-3,7.8878317832786468E-2]
["Vin_tran",1,null,"Low side switching Cds","LowSide Cds",{"$f":"170/RDS_ON/60","v":18.888888888888893},"pF",null,null,null,null,"Total system loss (W)",{"$f":"SUM(M5:M12)+M14","v":1.2263976860755503},null,"RSD(ON):","Buck Switching FET DC resistance",null,null,null,null,null,null,0.32,0.12418168858592414,0.38806777683101296,0.53447516536271344,5.2762417318643284E-2,0.35525386490854444,6.3262349414722557E-2,7.3464320259694765E-3,0.14567784139667608,1.5561114542052114E-3,7.8878317832786468E-2]
["ESR",{"$f":"B18/((4/0.9)*0.9)","v":0.25},null,"IC Quiescent current","Quiescent current",2,"mA",null,null,null,null,"Efficiency Boost",{"$f":"ILOAD*(VO+Vhead_V)/(ILOAD*(VO+Vhead_V)+M18)","v":0.82201351185376215},null,"RD:","Diode DC resistance",null,null,null,null,null,null,0.32,0.12418168858592415,0.38806777683101296,0.53447516536271344,5.2762417318643284E-2,0.35525386490854444,6.3262349414722557E-2,7.3464320259694765E-3,0.14567784139667608,1.5561114542052114E-3,7.8878317832786468E-2]
["Cin_bulk",{"$f":"(0.5*(4/0.9)*0.9*0.00004176/B18)-B14","v":6.8135384615384609E-5},null,null,null,null,null,null,null,null,null,"Efficiency LED",{"$f":"ILOAD*VO/(ILOAD*(VO+Vhead_V)+M18)","v":0.82201351185376215},null,"VD:","Diode forword voltage",null,null,null,null,null,null,0.32,0.12418168858592415,0.38806777683101296,0.53447516536271344,5.2762417318643284E-2,0.35525386490854444,6.3262349414722557E-2,7.3464320259694765E-3,0.14567784139667608,1.5561114542052114E-3,7.8878317832786468E-2]
["Icb_rms",{"$f":"((3)^0.5/6)*B9/B19","v":0.75055534994651352},null,null,null,null,null,null,null,null,null,null,null,null,"ILOAD:","Total load at Buck output",null,null,null,null,null,null,0.32,0.12418168858592415,0.38806777683101296,0.53447516536271344,5.2762417318643284E-2,0.35525386490854444,6.3262349414722557E-2,7.3464320259694765E-3,0.14567784139667608,1.5561114542052114E-3,7.8878317832786468E-2]
[null,null,null,null,null,null,null,null,null,null,null,null,null,null,"L:","Inductance value of inductor",null,null,null,null,null,null,0.32,0.12418168858592415,0.38806777683101296,0.53447516536271344,5.2762417318643284E-2,0.35525386490854444,6.3262349414722557E-2,7.3464320259694765E-3,0.14567784139667608,1.5561114542052114E-3,7.8878317832786468E-2]
["Co",{"$f":"Ipp/(8*B11*0.01*B10)","v":1.1134899278389863E-6},null,null,null,null,null,null,null,null,null,null,null,null,"FS:","Swithing Frequency",null,null,null,null,null,null,0.32,0.12418168858592415,0.38806777683101296,0.53447516536271344,5.2762417318643284E-2,0.35525386490854444,6.3262349414722557E-2,7.3464320259694765E-3,0.14567784139667608,1.5561114542052114E-3,7.8878317832786468E-2]
["Cout_overshoot",{"$f":"B8^2*L/((12+2)^2-12^2)","v":6.7692307692307687E-6},null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,0.32,0.12418168858592415,0.38806777683101296,0.53447516536271344,5.2762417318643284E-2,0.35525386490854444,6.3262349414722557E-2,7.3464320259694765E-3,0.14567784139667608,1.5561114542052114E-3,7.8878317832786468E-2]
["Cout_undershoot",{"$f":"4*B8/(2*FS)","v":7.9999999999999996E-6},null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,0.32,0.12418168858592415,0.38806777683101296,0.53447516536271344,5.2762417318643284E-2,0.35525386490854444,6.3262349414722557E-2,7.3464320259694765E-3,0.14567784139667608,1.5561114542052114E-3,7.8878317832786468E-2]
["Icap_rms",{"$f":"Ipp/(12)^0.5","v":0.15428969029866618},null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,0.32,0.12418168858592415,0.38806777683101296,0.53447516536271344,5.2762417318643284E-2,0.35525386490854444,6.3262349414722557E-2,7.3464320259694765E-3,0.14567784139667608,1.5561114542052114E-3,7.8878317832786468E-2]
["ESR_power",{"$f":"0.005*B11*B8/(B26)^2","v":50.408924478496495}]
[]
[]
[]
[]
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