197 lines
9.2 KiB
Plaintext
197 lines
9.2 KiB
Plaintext
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* Copyright (c) 2016 Linear Technology Corporation. All rights reserved.
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* Author: Dan Eddleman
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*
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*SOAtherm PCB Thermal Model
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***************************************************************
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.subckt TopsideCopper Tcenter
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*****PARAMETERS THAT SHOULD BE OVERRIDDEN BY PASSED VALUES*******
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.param Area_Contact_mm2=100
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.param Area_PCB_mm2=10000
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.param Copper_Thickness_oz=1
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.param PCB_FR4_Thickness_mm=1.5
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.param lfm=0
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*****************************************************************
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.param Enable_Radiation=1
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.param TambientRadiation={Tambient}
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.param TambientConvection={Tambient}
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.param Tambient=85
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.param emissivity=0.8
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.param hconv0=1.1625E-5
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R0 N001 Tcenter {r0}
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R1 N002 N001 {r1}
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R2 N003 N002 {r2}
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R3 N004 N003 {r3}
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R4 N005 N004 {r4}
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R5 N006 N005 {r5}
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R6 N007 N006 {r6}
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R7 N008 N007 {r7}
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R8 N009 N008 {r8}
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R9 Tedge N009 {r9}
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C1 N001 0 {c1}
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C2 N002 0 {c2}
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C3 N003 0 {c3}
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C4 N004 0 {c4}
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C5 N005 0 {c5}
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C6 N006 0 {c6}
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C7 N007 0 {c7}
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C8 N008 0 {c8}
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C9 N009 0 {c9}
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C10 Tedge 0 {c10}
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C0 Tcenter 0 {c0}
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V1 TambientConvection 0 {TambientConvection}
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XXtopRad0 TambientRadiation N001 radiation params: Area_mm2=a10 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXtopRad1 TambientRadiation N002 radiation params: Area_mm2=a21 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXtopRad2 TambientRadiation N003 radiation params: Area_mm2=a32 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXtopRad3 TambientRadiation N004 radiation params: Area_mm2=a43 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXtopRad4 TambientRadiation N005 radiation params: Area_mm2=a54 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXtopRad5 TambientRadiation N006 radiation params: Area_mm2=a65 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXtopRad6 TambientRadiation N007 radiation params: Area_mm2=a76 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXtopRad7 TambientRadiation N008 radiation params: Area_mm2=a87 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXtopRad8 TambientRadiation N009 radiation params: Area_mm2=a98 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXtopRad9 TambientRadiation Tedge radiation params: Area_mm2=a109 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXtopConv0 TambientConvection N001 convection params: Area_mm2=a10 lfm={lfm} hconv0={hconv0}
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XXtopConv1 TambientConvection N002 convection params: Area_mm2=a21 lfm={lfm} hconv0={hconv0}
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XXtopConv2 TambientConvection N003 convection params: Area_mm2=a32 lfm={lfm} hconv0={hconv0}
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XXtopConv3 TambientConvection N004 convection params: Area_mm2=a43 lfm={lfm} hconv0={hconv0}
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XXtopConv4 TambientConvection N005 convection params: Area_mm2=a54 lfm={lfm} hconv0={hconv0}
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XXtopConv5 TambientConvection N006 convection params: Area_mm2=a65 lfm={lfm} hconv0={hconv0}
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XXtopConv6 TambientConvection N007 convection params: Area_mm2=a76 lfm={lfm} hconv0={hconv0}
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XXtopConv7 TambientConvection N008 convection params: Area_mm2=a87 lfm={lfm} hconv0={hconv0}
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XXtopConv8 TambientConvection N009 convection params: Area_mm2=a98 lfm={lfm} hconv0={hconv0}
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XXtopConv9 TambientConvection Tedge convection params: Area_mm2=a109 lfm={lfm} hconv0={hconv0}
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rFR4_0 N001 N010 {4k*PCB_FR4_Thickness_mm/a10}
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rFR4_1 N002 N011 {4k*PCB_FR4_Thickness_mm/a21}
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rFR4_2 N003 N012 {4k*PCB_FR4_Thickness_mm/a32}
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rFR4_3 N004 N013 {4k*PCB_FR4_Thickness_mm/a43}
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rFR4_4 N005 N014 {4k*PCB_FR4_Thickness_mm/a54}
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rFR4_5 N006 N015 {4k*PCB_FR4_Thickness_mm/a65}
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rFR4_6 N007 N016 {4k*PCB_FR4_Thickness_mm/a76}
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rFR4_7 N008 N017 {4k*PCB_FR4_Thickness_mm/a10}
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rFR4_8 N009 N018 {4k*PCB_FR4_Thickness_mm/a87}
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rFR4_9 Tedge N019 {4k*PCB_FR4_Thickness_mm/a98}
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XXbottomRad0 TambientRadiation N010 radiation params: Area_mm2=a10 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXbottomRad1 TambientRadiation N011 radiation params: Area_mm2=a21 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXbottomRad2 TambientRadiation N012 radiation params: Area_mm2=a32 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXbottomRad3 TambientRadiation N013 radiation params: Area_mm2=a43 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXbottomRad4 TambientRadiation N014 radiation params: Area_mm2=a54 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXbottomRad5 TambientRadiation N015 radiation params: Area_mm2=a65 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXbottomRad6 TambientRadiation N016 radiation params: Area_mm2=a76 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXbottomRad7 TambientRadiation N017 radiation params: Area_mm2=a87 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXbottomRad8 TambientRadiation N018 radiation params: Area_mm2=a98 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXbottomRad9 TambientRadiation N019 radiation params: Area_mm2=a109 Enable_Radiation={Enable_Radiation} emissivity={emissivity}
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XXbottomConv0 TambientConvection N010 convection params: Area_mm2=a10 lfm={lfm} hconv0={hconv0}
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XXbottomConv1 TambientConvection N011 convection params: Area_mm2=a21 lfm={lfm} hconv0={hconv0}
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XXbottomConv2 TambientConvection N012 convection params: Area_mm2=a32 lfm={lfm} hconv0={hconv0}
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XXbottomConv3 TambientConvection N013 convection params: Area_mm2=a43 lfm={lfm} hconv0={hconv0}
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XXbottomConv4 TambientConvection N014 convection params: Area_mm2=a54 lfm={lfm} hconv0={hconv0}
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XXbottomConv5 TambientConvection N015 convection params: Area_mm2=a65 lfm={lfm} hconv0={hconv0}
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XXbottomConv6 TambientConvection N016 convection params: Area_mm2=a76 lfm={lfm} hconv0={hconv0}
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XXbottomConv7 TambientConvection N017 convection params: Area_mm2=a87 lfm={lfm} hconv0={hconv0}
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XXbottomConv8 TambientConvection N018 convection params: Area_mm2=a98 lfm={lfm} hconv0={hconv0}
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XXbottomConv9 TambientConvection N019 convection params: Area_mm2=a109 lfm={lfm} hconv0={hconv0}
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V2 TambientRadiation 0 {TambientRadiation}
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C11 N010 0 {c1_FR4}
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C12 N011 0 {c2_FR4}
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C13 N012 0 {c3_FR4}
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C14 N013 0 {c4_FR4}
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C15 N014 0 {c5_FR4}
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C16 N015 0 {c6_FR4}
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C17 N016 0 {c7_FR4}
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C18 N017 0 {c8_FR4}
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C19 N018 0 {c9_FR4}
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C20 N019 0 {c10_FR4}
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.param Rcopper_PCB_per_square=1/(0.391*0.035*Copper_Thickness_oz)
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.param Ccopper_PCB_per_mm2=400*8.96E-6*0.035*Copper_Thickness_oz
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.param Cfr4_PCB_per_mm2=600*2E-6*PCB_FR4_Thickness_mm
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.param radius0=SQRT(Area_Contact_mm2/pi)
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.param radius10=SQRT(Area_PCB_mm2/pi)
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.param radius9=radius0+(radius10-radius0)/2
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.param radius8=radius0+(radius9-radius0)/2
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.param radius7=radius0+(radius8-radius0)/2
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.param radius6=radius0+(radius7-radius0)/2
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.param radius5=radius0+(radius6-radius0)/2
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.param radius4=radius0+(radius5-radius0)/2
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.param radius3=radius0+(radius4-radius0)/2
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.param radius2=radius0+(radius3-radius0)/2
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.param radius1=radius0+(radius2-radius0)/2
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.func Area(radius_outer,radius_inner) {pi*pow(radius_outer,2)-pi*pow(radius_inner,2)}
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.param a0=Area(radius0,0)
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.param a10=Area(radius1,radius0)
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.param a21=Area(radius2,radius1)
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.param a32=Area(radius3,radius2)
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.param a43=Area(radius4,radius3)
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.param a54=Area(radius5,radius4)
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.param a65=Area(radius6,radius5)
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.param a76=Area(radius7,radius6)
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.param a87=Area(radius8,radius7)
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.param a98=Area(radius9,radius8)
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.param a109=Area(radius10,radius9)
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.param c0=Ccopper_PCB_per_mm2*a0
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.param c1=Ccopper_PCB_per_mm2*a10
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.param c2=Ccopper_PCB_per_mm2*a21
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.param c3=Ccopper_PCB_per_mm2*a32
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.param c4=Ccopper_PCB_per_mm2*a43
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.param c5=Ccopper_PCB_per_mm2*a54
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.param c6=Ccopper_PCB_per_mm2*a65
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.param c7=Ccopper_PCB_per_mm2*a76
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.param c8=Ccopper_PCB_per_mm2*a87
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.param c9=Ccopper_PCB_per_mm2*a98
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.param c10=Ccopper_PCB_per_mm2*a109
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.param c1_FR4=Cfr4_PCB_per_mm2*a10
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.param c2_FR4=Cfr4_PCB_per_mm2*a21
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.param c3_FR4=Cfr4_PCB_per_mm2*a32
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.param c4_FR4=Cfr4_PCB_per_mm2*a43
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.param c5_FR4=Cfr4_PCB_per_mm2*a54
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.param c6_FR4=Cfr4_PCB_per_mm2*a65
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.param c7_FR4=Cfr4_PCB_per_mm2*a76
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.param c8_FR4=Cfr4_PCB_per_mm2*a87
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.param c9_FR4=Cfr4_PCB_per_mm2*a98
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.param c10_FR4=Cfr4_PCB_per_mm2*a109
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.func Squares(radius_outer,radius_inner) {(radius_outer-radius_inner)/(2*pi*(radius_outer+radius_inner)/2)}
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.param r0=Squares(radius1,radius0)*Rcopper_PCB_per_square
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.param r1=Squares(radius2,radius1)*Rcopper_PCB_per_square
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.param r2=Squares(radius3,radius2)*Rcopper_PCB_per_square
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.param r3=Squares(radius4,radius3)*Rcopper_PCB_per_square
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.param r4=Squares(radius5,radius4)*Rcopper_PCB_per_square
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.param r5=Squares(radius6,radius5)*Rcopper_PCB_per_square
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.param r6=Squares(radius7,radius6)*Rcopper_PCB_per_square
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.param r7=Squares(radius8,radius7)*Rcopper_PCB_per_square
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.param r8=Squares(radius9,radius8)*Rcopper_PCB_per_square
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.param r9=Squares(radius10,radius9)*Rcopper_PCB_per_square
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.ends TopsideCopper
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* block symbol definitions
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.subckt radiation Tamb_C Tsurf_C
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B1 Tsurf_C Tamb_C I=IF(Enable_Radiation>0,emissivity*sigma_mm2*{Area_mm2}*(Pow(V(Tsurf_C)+273,4)-Pow(V(Tamb_C)+273,4)),0)
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.param emissivity=0.8
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.param sigma_mm2=5.6703E-14
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.param Enable_Radiation=1
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.ends radiation
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.subckt convection Tamb_C Tsurf_C
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Rair Tsurf_C Tamb_C {1/(hconv*Area_mm2)}
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.param LFM=0
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.param PCB_FR4_Thickness_mm=1.5
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.param hconv0=1.1625e-5
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.param hconv={hconv0*(1+0.013*POW(LFM,0.8))}
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.ends convection
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