{"text_format":"1","workbook":"xlsx","n_sheets":3,"sheets":["LM5088 Calculator","Power Dissipation","Bode Plots"],"not_rendered":{"charts":4,"images":3,"macros":1,"external_links":0,"defined_names":56,"comments":2,"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":"LM5088 Calculator","index":0,"n_rows":63,"n_cols":36,"rows_kept":63,"cut":false,"hidden":false,"merged":[[31,4,31,7]]}
["LM(2)5088-1/2 Quick Start Component Calculator",null,null,"Date:1 Dec 2008",null,"Ajay Hari","Version 1.1"]
[]
[]
[]
[]
[]
["Step 1 General Requirements"]
["Enter Design parameters in the shaded","Vin(min)(V)",{"$f":"48-0.48","v":47.52},null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"Controller Selection"]
["Cells","Vin(max)(V)",{"$f":"48+0.48","v":48.48},null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"Dither"]
[null,"Vout(V)",24,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"Restart"]
[null,"Max. Load Current (A)",10]
[null,"Ripple Current % of Max. Load Current",0.12,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"Yes"]
[null,"Peak-Peak output voltage ripple(mV) ",100,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,"No"]
[null,"Max. output volts deviation(mV)",300]
["Step 2 Controller Selection",{"$f":"IF(Vin_min<Vout,\"It is a Buck converter\",\"\")","v":""}]
[null,"Select the Controller Version ","Dither"]
[null,"Recommended Device",{"$f":"IF(ControllerSelect=\"Restart\", (IF(Vin_max>42,\"LM5088-2\",\"LM25088-2\")),(IF(Vin_max>42,\"LM5088-1\",\"LM25088-1\")))","v":"LM5088-1"}]
[]
["Step 3 Switching Frequency","Fsw(kHz)",300]
[{"$f":"IF(Fsw>MIN(Fswmax,Fswmin),\"Part will enter into low dropout mode at VinMin, Decrease Fsw or, Change Vin/Vout range\",\" \")","v":" "}]
["Step 4 Frequency Programming","RRT(kΩ)",{"$f":"((0.001/Fsw)-280*0.000000001)/(152*0.000000001)","v":20.087719298245613}]
[]
["Step 5 Inductor Value","L(μH)",{"$f":"(Vout/(I_load_ripple*Max_Ave_Iload*Fsw*10000))*(1-(Vout/Vin_max))*10000000","v":33.663366336633665}]
[]
["Step 6 Current Limit","Target(% Beyond Max. Load)",0.19]
[null,"Peak Load Current at Current Limit (A)",{"$f":"(1+ILoad_margin)*Max_Ave_Iload*(1+(I_load_ripple/2))","v":12.613999999999999}]
[null,"Current Sense Resistor (Rs)(mΩ)",{"$f":"0.12/(Ipk_load+(Vout/(L*Fsw*0.001)))*1000","v":8.0050855837826393}]
[]
["Step 7 Ramp Configuration","CRamp(pF)",{"$f":"5*100*L/Rs","v":2102.6237623762372}]
[null,{"$f":"IF(C30=\"\",\" \",\"Rramp(kΩ)\")","v":"Rramp(kΩ)"},{"$f":"IF(Vout>5, (VCC-Vramp)*1000/(Ios-25), \"NA\")","v":78.100242011333521}]
[]
["Step 8 Output Capacitors","COUT1(uF)",{"$f":"(L*((Max_Ave_Iload+(I_load_ripple*Max_Ave_Iload/2))^2))/(((Op_Deviation/1000)+Vout)^2-Vout^2)","v":261.0362899644},null,"LM5088 List of Components"]
[null,"COUT2(uF)",47,null,"Component","Description","Value","Rating"]
[null,"Max. Allowable ESR(mΩ)",{"$f":"DeltaVout/(I_load_ripple*Max_Ave_Iload)","v":83.333333333333343},null,"Cin ","Input capacitor",5.3666666666666654,{"$f":"Vin_max*1.3","v":63.024000000000001}]
[null,"COUT_TOTAL (uF)",{"$f":"Cout1+Cout2","v":308.0362899644},null,"CRamp","Ramp capacitor",{"$f":"Cramp","v":2102.6237623762372},"5 V"]
[null,null,null,null,"Css","Soft start capacitor",{"$f":"Css","v":1.6666666666666666E-2},"5 V"]
["Step 9 Input Capacitors","Input Capacitor Cin(uF)",{"$f":"Max_Ave_Iload/2/Fsw*1000","v":16.666666666666668},null,"COUT1","Output capacitor",{"$f":"Cout1","v":261.0362899644},{"$f":"Vout*1.1","v":26.400000000000002}]
[null,null,null,null,"COUT2","Output capacitor",{"$f":"Cout2","v":47},{"$f":"Vout*1.1","v":26.400000000000002}]
["Step 10 VIN UV Shutdown","Select \"Yes\" or \"No\"","No",null,"CCOMP","Compensation capacitor",{"$f":"Ccomp","v":387.36183718749754},{"$f":"Vout*1.1","v":26.400000000000002}]
[null,{"$f":"IF(C39=\"YES\",\"UV Voltage (V)\",\"\")","v":""},"NA",null,"CHF","Compensation capacitor",{"$f":"Chf","v":3.8736183718749753},{"$f":"Vout*1.1","v":26.400000000000002}]
[null,{"$f":"IF(C39=\"YES\",\"Ruv2(kΩ)\",\"\")","v":""},"NA",null,"CVCC","VCC bypass capacitor",{"$f":"CVCC","v":0.64935064935064934},"16V"]
[null,{"$f":"IF(C39=\"YES\",\"Ruv1(kΩ)\",\"\")","v":""},"NA",null,"CBOOT","Highside Bootstrap capacitor",{"$f":"Cboot","v":64.935064935064929},"16V"]
[null,null,null,null,"CDITHER (LM(2)5088-1)","Dither Capacitor",{"$f":"Cdither","v":6.9444444444444448E-2},{"$f":"IF(OR(Controller=\"LM5088-1\",Controller=\"LM25088-1\"),\"5V\",\"NA\")","v":"5V"}]
["Step 11 Feedback Resistors","RFB1 (kΩ)",1.839,null,"CRESTART(LM(2)5088-2)","Hiccup Restart",{"$f":"Crestart","v":"NA"},{"$f":"IF(OR(Controller=\"LM5088-2\",Controller=\"LM25088-2\"),\"5V\",\"NA\")","v":"NA"}]
[null,"RFB2 (kΩ)",{"$f":"_Rfb1*((Vout/1.205)-1)","v":34.788385892116182},null,"RFB1","Feedback resistor",{"$f":"_Rfb1","v":1.839},{"$f":"IF((Vref*Vref/(_Rfb1*1000))<0.0625,\"1/16 W\",\"1/8 W\")","v":"1/16 W"}]
[null,null,null,null,"RFB2","Feedback resistor",{"$f":"_Rfb2","v":34.788385892116182},{"$f":"IF((_Rfb2*(1/1000)*(Vref/_Rfb1)^2)<0.0625,\"1/16 W\",\"1/8 W\")","v":"1/16 W"}]
["Step 12 Compensation Network","Bandwidth (kHz)",30,null,"RUV1","UVLO divider resistor",{"$f":"IF(UV_Selector=\"Yes\", _Ruv1, \"-\")","v":"-"},{"$f":"IF(UV_Selector=\"YES\",(IF((Vin_max*_Ruv1/(_Ruv2+_Ruv1))^2/(_Ruv1*1000)>0.0625,\"1/8W\",\"1/16W\")),\"-\")","v":"-"}]
[null,"RCOMP(kΩ)",{"$f":"(_Rfb2*6.28*Fbw*Cout1)*(10*Rs*0.000001)","v":136.95630959024876},null,"RUV2","UVLO divider resistor",{"$f":"IF(UV_Selector=\"Yes\",_Ruv2, \"-\")","v":"-"},{"$f":"IF(UV_Selector=\"YES\",(IF((Vin_max*_Ruv2/(_Ruv2+_Ruv1))^2/(_Ruv2*1000)>0.0625,\"1/8W\",\"1/16W\")),\"-\")","v":"-"}]
[null,"CCOMP(pF)",{"$f":"10*1000000/(2*PI()*Fbw*Rcomp)","v":387.36183718749754},null,"Rs","Sense Resistor",{"$f":"Rs","v":8.0050855837826393},{"$f":"IF(Iload*Iload*Rs*0.001<0.25, \"1/4 W\", IF(Iload*Iload*Rs*0.001<0.5, \"1/2 W\", IF(Iload*Iload*Rs*0.001<1,\"1 W\")))","v":"1/4 W"}]
[null,"CHF(pF)",{"$f":"IF(Chf<47,\"47\",Chf)","v":"47"},null,"RRT","Oscillator Timing resistor",{"$f":"RT","v":20.087719298245613},{"$f":"IF((Vref*Vref/RT)<0.0625,\"1/16 W\",\"1/8 W\")","v":"1/8 W"}]
[null,null,null,null,"L","Inductor",{"$f":"L","v":33.663366336633665},{"$f":"Ipk_load*1.1","v":13.875400000000001}]
["Step 13 Soft Start Capacitor","Soft-Start Time (ms)",2,null,"RRamp","Optional Ramp resistor",{"$f":"IF(Vout>5, (VCC-Vramp)*1000/(Ios-25), \"NA\")","v":78.100242011333521},{"$f":"IF(G52=\"-\",\"-\",\"1/16 W\")","v":"1/16 W"}]
[null,"Soft-Start Capacitor Css (uF)",{"$f":"(10*tss*0.001)/1.2","v":1.6666666666666666E-2},null,"RCOMP","Compensation resistor",{"$f":"Rcomp","v":136.95630959024876},"1/8 W"]
[null,null,null,null,"D","Schottky Diode","Voltage Rating",{"$f":"1.1*Vin_max","v":53.328000000000003}]
["Step 14 CBOOT & VCC Capacitor","FET total gate charge QT (nano Coulombs)",20,null,"Q","MOSFET","Voltage Rating",{"$f":"1.1*Vin_max","v":53.328000000000003}]
[null,"CBOOT(nF)",{"$f":"Qg/(0.04*7.7)","v":64.935064935064929}]
[null,"CVCC(uF)",{"$f":"IF(CVCC<0.1,\"0.1\",CVCC)","v":0.64935064935064934}]
[]
["Step 15 Dither Capacitor(LM(2)5088-1)",{"$f":"IF(OR(Controller=\"LM5088-1\",Controller=\"LM25088-1\"),\"Cdither(uF)\",\"NA\")","v":"Cdither(uF)"},{"$f":"IF(ControllerSelect=\"Dither\",(2500/(Fsw*1000*0.12)),\"NA\")","v":6.9444444444444448E-2}]
[]
["Step 16 Restart Capacitor(LM(2)5088-2)",{"$f":"IF(OR(Controller=\"LM5088-2\",Controller=\"LM25088-2\"),\"Allowable current limit overload time (ms)\",\"NA\")","v":"NA"},"NA"]
[null,{"$f":"IF(OR(Controller=\"LM5088-2\",Controller=\"LM25088-2\"),\"Hiccup Sleep Time (ms)\",\"NA\")","v":"NA"},{"$f":"IF(ControllerSelect=\"Restart\",(Crestart*1000)/(1.2*1),\"NA\")","v":"NA"}]
[null,{"$f":"IF(OR(Controller=\"LM5088-2\",Controller=\"LM25088-2\"),\"Cres(uF)\",\"NA\")","v":"NA"},{"$f":"IF(ControllerSelect=\"Restart\",(50*n)/(1.2*1000),\"NA\")","v":"NA"}]

{"sheet":"Power Dissipation","index":1,"n_rows":14,"n_cols":12,"rows_kept":14,"cut":false,"hidden":false,"merged":[]}
[]
[]
[]
[]
[]
["Assumptions"]
["Ambient Temperature",85]
["Package RJA",40]
[]
[]
["VIN",{"$f":"Vin_min","v":47.52},{"$f":"Vin_min+(Vin_max-Vin_min)/10","v":47.616},{"$f":"Vin_min+2*(Vin_max-Vin_min)/10","v":47.712000000000003},{"$f":"Vin_min+3*(Vin_max-Vin_min)/10","v":47.808},{"$f":"Vin_min+4*(Vin_max-Vin_min)/10","v":47.904000000000003},{"$f":"Vin_min+5*(Vin_max-Vin_min)/10","v":48},{"$f":"Vin_min+6*(Vin_max-Vin_min)/10","v":48.095999999999997},{"$f":"Vin_min+7*(Vin_max-Vin_min)/10","v":48.192},{"$f":"Vin_min+8*(Vin_max-Vin_min)/10","v":48.287999999999997},{"$f":"Vin_min+9*(Vin_max-Vin_min)/10","v":48.384},{"$f":"Vin_min+10*(Vin_max-Vin_min)/10","v":48.48}]
["IC Power",{"$f":"B11*(7*0.001+Qg*Fsw*0.000001)","v":0.61776000000000009},0.619008,0.62025600000000014,0.62150400000000006,0.62275200000000008,0.62400000000000011,0.62524800000000003,0.62649600000000005,0.62774399999999997,0.62899200000000011,0.63024000000000002]
["Delta TJ above TA",{"$f":"B12*RJA","v":24.710400000000003},24.76032,24.810240000000007,24.86016,24.910080000000004,24.960000000000004,25.009920000000001,25.059840000000001,25.109759999999998,25.159680000000005,25.209600000000002]
["Junction temperature",{"$f":"TA+B12*RJA","v":109.71040000000001},109.76032000000001,109.81024000000001,109.86016000000001,109.91008000000001,109.96000000000001,110.00991999999999,110.05984000000001,110.10975999999999,110.15968000000001,110.20959999999999]

{"sheet":"Bode Plots","index":2,"n_rows":31,"n_cols":21,"rows_kept":31,"cut":false,"hidden":false,"merged":[]}
[null,null,"Frequency (Hz)","Frequency (rad/sec)","Modulator\nGain\n(dB)","Modulator\nPhase\n(deg)","Error Amplifier Gain\n(dB)","Error Amplifier Phase (deg)","Overall Loop\nGain\n(dB)","Loop\nPhase\n(deg)"]
[null,null,0.1,{"$f":"2*PI()*C2","v":0.62831853071795862},{"$f":"20*LOG( DC_GAIN_MOD/SQRT( (D2*Rload*Cout1*0.000001)^2 + 1))","v":29.536904573322921},{"$f":"-ATAN(D2*Rload*Cout1*0.000001)*(180/PI())","v":-2.2553534288054504E-2},{"$f":"20*LOG(SQRT((D2*Rcomp*Ccomp*0.000000001)^2+1))   -   20*LOG((_Rfb2*Ccomp*0.000000001*D2))-20*LOG(SQRT((Rcomp*Chf*0.000000001*D2)^2+1))","v":101.4453804226967},{"$f":"ATAN(D2*Rcomp*Ccomp*0.000000001)*180/PI() -90 - ATAN(D2*Rcomp*Chf*0.000000001)*180/PI()","v":-89.998109239276772},{"$f":"E2+G2","v":130.98228499601962},{"$f":"F2+H2+180","v":89.979337226435177}]
[null,null,0.2,{"$f":"2*PI()*C3","v":1.2566370614359172},29.536902554541054,-4.5107061586893663E-2,95.42478052389211,-89.996218478557793,{"$f":"E3+G3","v":124.96168307843317},{"$f":"F3+H3+180","v":89.958674459855317}]
[null,null,0.5,3.1415926535897931,29.536888423094283,-0.11276753165623865,87.465980451776602,-89.990546196468756,117.00286887487088,89.896686271875012]
[null,null,1,6.2831853071795862,29.536837954016878,-0.22553418967030647,81.445380900372825,-89.981092393468032,110.9822188543897,89.793373416861655,null,null,null,null,null,null,null,"Additional Definitions"]
[null,null,2,12.566370614359172,29.536636083572052,-0.4510613904468983,75.42478243459631,-89.962184791180206,104.96141851816836,89.586753818372898,null,null,null,null,null,null,null,null,null,"UVLO Selector"]
[null,null,5,31.415926535897931,29.535223253132958,-1.1275311977587867,67.465992393663797,-89.905462052222589,97.001215646796751,88.967006750018626,null,null,null,null,null,null,null,"RLOAD",{"$f":"Vout/Max_Ave_Iload","v":2.4},"Yes"]
[null,null,10,62.831853071795862,29.53018117879931,-2.2541897572911749,61.445428667720542,-89.810924634956706,90.975609846519859,87.934885607752122,null,null,null,null,null,null,null,"DC GAIN MOD",{"$f":"Rload/(10*Rs*0.001)","v":29.980941176470584},"No"]
[null,null,20,125.66370614359172,29.510071215875129,-4.5014226345212975,55.424973500770612,-89.621853513899524,84.935044716645734,85.876723851579186,null,null,null,null,null,null,null,"VCC",7.7]
[null,null,50,314.15926535897933,29.371849968506378,-11.134452352726909,47.467186416553936,-89.05470804262491,76.839036385060311,79.81083960464818]
[null,null,100,628.31853071795865,28.911283588781842,-21.486258414462586,41.450202750719669,-88.109946159467299,70.361486339501511,70.403795426070118]
[null,null,200,1256.6370614359173,27.442320318433339,-38.212187804360646,35.444037784755182,-86.224122346392861,62.88635810318852,55.563689849246487]
[null,null,500,3141.5926535897929,22.658333041678546,-63.065472954942848,27.584960500429535,-80.633170669410262,50.243293542108077,36.30135637564689]
[null,null,1000,6283.1853071795858,17.363453287762525,-75.745920025404786,21.902907068804087,-71.756036401437683,39.266360356566608,32.498043573157531]
[null,null,2000,12566.370614359172,11.544953317073819,-82.760957967722462,17.021595917786648,-56.69189867874924,28.566549234860467,40.547143353528298]
[null,null,5000,31415.926535897932,3.6444682263474082,-87.091377673982478,13.237138201140629,-31.918597785945707,16.881606427488038,60.990024540071815]
[null,null,10000,62831.853071795864,-2.367736670396392,-88.544751260748626,12.272397487487291,-18.60839666699,9.9046608170908996,72.84685207226137]
[null,null,20000,125663.70614359173,-8.3862352915003004,-89.272258263243685,11.980329279911846,-12.344840444238475,3.5940939884115455,78.382901292517843]
[null,null,50000,314159.26535897929,-16.344446920895145,-89.708890155292821,11.799569616907091,-12.895952570476132,-4.5448773039880539,77.395157274231053]
[null,null,100000,628318.53071795858,-22.364962749942698,-89.854444138273081,11.449287310370785,-20.153306824577456,-10.915675439571913,69.992249037149463]
[null,null,200000,1256637.0614359172,-28.385541641909931,-89.927221951713179,10.306923947473296,-34.549439769624456,-18.078617694436637,55.523338278662365]
[null,null,500000,3141592.653589793,-36.344335929364981,-89.970888767533793,6.1307475906484568,-59.38001401979794,-30.213588338716523,30.649097212668266]
[null,null,1000000,6283185.307179586,-42.364935001788851,-89.985444382827509,1.0711545247929326,-73.472642588886387,-41.29378047699592,16.541913028286103]
[]
[]
[]
[]
[]
[]
[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,{"$f":"(Vout/Vin_max)/(120*0.000000001*1000)","v":4125.4125412541252}]
[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,{"$f":"(1-(Vout/Vin_min))/(0.00000055*1000)","v":899.90817263544545}]