Microsoft PowerPoint - LED Packaging Process.ppt

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1 CFD Analysis Process of LED Packaging ATES

2 Agenda ATES 소개 ATES 연혁 지원시스템 Icepak 소개 모델링방법 재질및경계조건의설정 격자생성및 Solving Parametric Analysis & Optimization 비등방성열전도율 Icepak을이용한 LED 해석사례 (1) 한국광기술원, 메디아나전자 Icepak을이용한 LED 해석사례 (2) 한국광기술원

3 ATES 연혁 1990 년 CIES 설립 1991년 IBM SR 지정, 각종 SW 독점공급계약체결 Fluent(`91) CATIA DASP(`93) MAGMA(`93) ADINA(`94) SFTC(`95) 1995년 ATES 설립각종 SW 독점공급계약체결 POLYFLOW, MIXIM, FIDAP(`96) ICEPAK, ACERC(`96) FIELDVIEW(`97) PAM/STAMP, CRASH, SERIES(`97) MSC/PATRAN, MSC/NASTRAN(`98)

4 기술지원 On-site support Engineering consulting Homepage BBS Technical Note E-newsletter Customer Application Seminar Production Seminar User Group Meeting Training 기본교육 응용교육 고급교육 교육센터운영

5 Modeling Icon을이용 Macro Key Cad data의 Import E-Cad : IDF M-Cad : IGES, Step, Tetin Data : CSV, Excel IcePro의이용 3D 3D Cad Cad data data Icepak Icepak Model Model 계산결과계산결과확인확인

6 재질및경계조건의설정 고체, 액체및기체의풍부한재질 Library 구축 Package, Fan, Filter 및 Thermal interface 관련 Library 구축 Wizard 형식의설정방법 경계조건의경계조건의Wizard type type 설정설정 Icepak Icepak Libraries Libraries

7 격자생성및 Solving ICEM CFD Engineering 社의 Hexa, Tetra Mesh를이용하여단시간내에 Mesh를자동생성함. Solver는별도의설정없이 Wizard 창에서클릭한번으로구동됨. 격자격자Wizard 및격자의모습및격자의모습 Solver Solver Wizard Wizard 모습모습

8 Parametric Analysis & Optimization Geometry, Velocity, Heat Dissipation 등의변수화로 Optimizing Analysis 수행 변수지정 Best Case

9 비등방성열전도율 PCB, IC Package 등의일반적 Material 의경우비등방성열전도율을갖게됨. 수지계열 ( 작은열전도율 ) 동계열 ( 큰열전도율 ) 수직방향 ( 작은열전도율 ) 수평방향 ( 큰열전도율 ) Icepak 은열전도율을 4 가지 Mode 로표현가능함. Isotropic ( 등방성 ) Orthotropic ( 직교비등방성 ) Anisotropic ( 완전비등방성 ) Biaxial (2축비등방성 )

10 Icepak 을이용한 LED 해석사례 (1)

11 SMD Type LED 의각요소의 Geometry 의변화에따른최고온도의변화예측 한국광기술원, 메디아나전자 ATES

12 AGENDA 1. Geometry & Conductivities 2. CASE 1 : Sapphire 두께변화에따른최고온도의변화 3. CASE 2 : Lead의형상및면적변화에따른최고온도의변화 4. CASE 3 : Thermal Paste의도막두께의변화에따른최고온도의변화 5. 결과및고찰 6. CASE 4 : Heat Sink 최적화 7. Heat sink 최적화에따른결론

13 Geometry SI Sub-mount Sapphire Heat Slug Lead Thermal paste Body Cathod Solders Anod Sub

14 Conductivities 실질적으로실질적으로LED LED가원활한원활한동작을동작을하는 Cooling Cooling 조건을조건을만들어주기만들어주기위하여위하여임의의 Heatsink Heatsink를장착한장착한모습 Heatsink Heatsink제원제원알리미늄알리미늄사출사출,, 30X10X30mm,8fin(1.4t) 각부요소의명칭 Sapphire SI subment Lead P-Solder Thermal Paste Body Sub material Cathod/Anod 열전도도 50 W/m-K 180 W/m-K W/m-K 50 W/m-K 50.2 W/m-K 0.08 W/m-K 0.08 W/m-K W/m-K

15 CASE 1 (N-GaN 두께변화에따른최고온도의변화 )

16 Boundary Condition 주변공기온도 : 20 Steady state Analysis : 완전열평형상태 Laminar Scheme 사용 Buoyancy force 적용 Radiation effect 적용 (Stefan Boltzmann s eq. 사용 ) 발열량 : 1 Watt N-GaN 의두께변화 : 0.015, 0.020, mm

17 Model and Mesh Mesh type :Hexa-unstructured mesh Non-Conformal Mesh 사용 Number of Mesh : 약 21 만 5 천여개 Plane Plane Cut Cut Emitter Emitter & Lead Lead 部

18 Temperature Contour Sapphire Sapphire 두께두께 :: 0.015mm 0.015mm Sapphire Sapphire 두께두께 :: 0.020mm 0.020mm N-GaN 두께 mm mm mm 최고온도 ( ) Sapphire Sapphire 두께두께 : : 0.025mm 0.025mm

19 CASE 2 (Lead 의형상및면적변화에따른최고온도의변화 )

20 Boundary Condition 주변공기온도 : 20 Steady state Analysis : 완전열평형상태 Laminar Scheme 사용 Buoyancy force 적용 Radiation effect 적용 (Stefan Boltzmann s eq. 사용 ) 발열량 : 1 Watt N-GaN의두께 : mm Heat sink와접하는 Lead의크기 : 1.9X2(3.8), 2.5X2(5.0), 3X2(6.0)

21 Temperature Contour Lead Lead :: 1.9X2(3.8mm 1.9X2(3.8mm 2 2 )) Lead Lead :: 2.5X2(3.8mm 2.5X2(3.8mm 2 2 )) Lead 면적최고온도 ( ) 2.5 mm mm mm Lead Lead :: 3.0X2(6mm 3.0X2(6mm 2 2 ))

22 CASE 3 (Thermal Paste 의도막두께의변화에따른최고온도의변화 )

23 Boundary Condition 주변공기온도 : 20 Steady state Analysis : 완전열평형상태 Laminar Scheme 사용 Buoyancy force 적용 Radiation effect 적용 (Stefan Boltzmann s eq. 사용 ) 발열량 : 1 Watt N-GaN의두께 : mm Heat sink와접하는 Lead의크기 : 1.9X2(3.8) Thermal Paste 도막의두께 : 0.05, 0.07, 0.09mm

24 Temperature Contour Thermal Thermal Paste Paste :: t=0.05mm t=0.05mm Thermal Thermal Paste Paste :: t=0.07mm t=0.07mm 도막두께 0.05mm 0.07mm 0.09mm 최고온도 ( ) Thermal Thermal Paste Paste :: t=0.09mm t=0.09mm

25 결과및고찰 N-GaN 의두께가 Emitter 의최고온도에미치는영향은 0.015mm 에서 0.025mm 으로 0.01mm 변화에대하여 2.61 의온도편차를보였다. 다시말하면이는 0.26 /micron 이라는막대한영향을미친것이다. 이것은 N-GaN 이 130W/m-K 의비교적높은열전도도를갖고있으면서 Sapphire 및 Sapphire 를 Body 와연결하는 solder ball 와직접연결되어있는부분이므로효과가큰것으로사료된다. Board 에직접닿는 Lead 의면적을 2.5mm 2 에서 6.0mm 2 으로변경시키면서결과를살펴보았으나발열부의온도에미치는영향이미미하여고려의가치가낮은것으로판단된다. 이것은발열부의열이 lead 보다 heat slug 를통하여열전달되는양이많기때문이다. SI-Sub mount 와 LED 의 Heat slug 부분을연결하는 Thermal paste 의두께의영향에대하여알아보기위하여도막두께를 0.05mm, 0.07mm, 0.09mm 로변화시키면서발열체의최고온도를분석했다. 도막의두께가 0.05mm 에서 0.09mm 로 0.04mm 두꺼워짐에의하여온도는 0.34 상승했다. 이는 /micron 으로서비교적큰영향을미치는인자로생각할수있다. 이외에도많은인자들이어느정도의영향을미칠것인가를찾아낸다면실질적으로 LED Packaging 분야는물론냉각시스템의전반적인열및유동적특성을고려한설계가이루어질수있을것으로판단된다.

26 CASE 4 (Heat Sink 최적화 )

27 Boundary Condition 주변공기온도 : 20 Steady state Analysis : 완전열평형상태 Laminar Scheme 사용 Buoyancy force 적용 Radiation effect 적용 (Stefan Boltzmann s eq. 사용 ) 발열량 : 1 Watt N-GaN의두께 : mm Heat sink와접하는 Lead의크기 : 1.9X2(3.8) Thermal Paste 도막의두께 : 0.05mm Heat sink의 Fin의수량및두께에따른일련의해석 => Parametric 기능이용 Heat sink 제원 : 알리미늄사출 최외곽크기 Fin 두께 Fin 갯수 30X10X30mm 1.0, 1.2, 1.4 6, 8, 10, 12

28 해석에사용된 Heat sink 의제원

29 Heat sink 의사양에따른온도결과 Maxmum Temp. at Emitter Fin 개수 : 6 Fin 개수 : 8 Fin 개수 : 10 Fin 개수 : 12 최저온도 t=1.0 t=1.2 t=1.4 t=1.0 t=1.2 t=1.4 t=1.0 t=1.2 t=1.4 t=1.0 t=1.2 t=1.4 Fin Fin의두께두께 (mm) (mm)

30 최적화된 Heat sink 의온도및속도장

31 Heat sink 최적화에따른결론 Heat sink의정해진외곽사이즈에서 Fin의개수및두께를변화시켜가면서최적의사양을유추한다. 최저온도는 heat sink의 fin의두께가 1.0mm이고 fin의개수가 8개일때및 fin의두께가 1.0, 1.2mm이고개수가 10개일때나타났다. Fin의개수가 12개일때에는 fin의두께가두꺼워질수록효과가오히려더욱악화되는경향이나타났는데, 이는 fin과 fin 사이의유동의속도가오히려느려졌기때문이다. 그렇지만정해진 heat sink의외곽크기의한계내에서는 LED의관리온도기준인 80 를맞추지못하므로 heat sink의크기를좀더크게해야할필요성이요구된다. 또한 heat sink의온도분포를보면 LED의 heat slug에의한열의방열이매우우수함을볼수있다. 이는또한 Lead의면적이큰영향을주지못하는이유이기도하다.

32 Icepak 을이용한 LED 해석사례 (2) ( 한국광기술원반도체공학회발표자료 )

33 Full Scheme 3D View of Design & Proto-Type Sample HP(High Power) Chip, Ceramic Package,PCB Ceramic Package HP Chip SMD Solder PCB

34 Specification of Wire Bonding Chip Specification Feature Growth Technique MOCVD Substrate Sapphire (0001) Structure InGaN MQW Chip size 1000±30μm 1000 ±30μm Wafer thickness 100± 5 μm Testing & sorting 100 % Packaging 20cm±5mm 20 cm±5mm (blue tape medium tack) Backside reflector Al metal Non Bin Number Blue Brightness(-X mw) 3 Dominant Wavelength(nm) V f (V) Min Max Typ Max ELO-BCRE455-X 60~80 80~ ~ ELO-BCRE460-X 60~80 80~ ~ ELO-BCRE465-X 60~80 80~ ~ ELO-BCRE470-X 60~80 80~ ~

35 Union of each part P-GaN & Electrode Chip Modeling N-GaN Buffer Layer Dimension Size 1 mm 1 mm Sapphire & Paste Thickness P-GaN N-GaN Buffer 2.12 mm 4 um 0.5 um Sapphire &Paste um

36 Spec. of each part Package & PCB Modeling LED Chip Reflector Body Package Sub. PCB Solder Paste Material GaN /Sapphire Ceramic Ceramic FR-4 (Compact Via) Pb 39.2 Sn 60.8 Epoxy Thermal Conductivity(W/m-K) X,Z : 2.3 Y : Dimension(mm 2 ) Thickness 80 um 500 um 400 um 350 um 10 mm 25 um

37 Pre-simulation Results (Unit : W) Input Power Vs. Junction Temperature Input Power Junction Temperature Max. Junction Temperature Regression Formula - Max. Junction Temperature = *Input Power Input Power(W)

38 Electrical PWR : W Evaluation Results Label Value Li1: Max 65.4 C Li1: Min 33.6 C Li2: Max 58.5 C Li2: Min 36.6 C Li3: Max 54.8 C Li3: Min 37.7 C Li4: Max 54.1 C Li4: Min 37.6 C Li5: Max 58.5 C Li5: Min 38.4 C Ar1: Max 65.8 C Ar1: Min 39.7 C

39 Evaluation Results Electrical PWR : W Label Value Li1: Max C Li1: Min 41.0 C Li2: Max C Li2: Min 51.8 C Li3: Max C Li3: Min 49.6 C Li4: Max 91.2 C Li4: Min 52.5 C Li5: Max 92.8 C Li5: Min 56.5 C Ar1: Max C Ar1: Min 99.3 C

40 Relative Heat Transfer rate Loss of Current Spreading Eval_Temp. Eval_PWR Regre_PWR Optical PWR Changed Heat(%) Current Spreading Loss(%) Percentage of Loss(%) Heat Transfer Rate = Electrical Input Power [100 - (Percent of Optical Power + Current Spreading Loss)] Electrical PWR(W)

41 PWR : W Re-Simulation Results N-GaN P-GaN Sapphire Paste Package_Sub Package_Ele Reflector Solder PCB Thermal Resistance Min Max Mean

42 Re-Simulation Results PWR : W < P-GaNP > < Sapphire > < PCB > < LTCC_Sub > N-GaN P-GaN Sapphire Paste Package_Sub Package_Ele Reflector Solder PCB Thermal Resistance Min Max Mean

43 Evaluation Results T3Ster 36.01K/W

44 PWR : W Re-Simulation Results N-GaN P-GaN Sapphire Paste Package_Sub Package_Ele Reflector Solder PCB Thermal Resistance Min Max Mean

45 Re-Simulation Results PWR : W < P-GaNP > < Sapphire > < PCB > < LTCC_Sub > N-GaN P-GaN Sapphire Paste Package_Sub Package_Ele Reflector Solder PCB Thermal Resistance Min Max Mean

46 T3Ster Evaluation Results K/W

47 Simulation Results of Multi-Chip Package

48 Full Scheme 3D View of Design & Proto-Type Sample Reflector,LTCC &Metal Substrate on Large Finned Heat Sink Reflector LTCC Metal Substrate Finned Heat Sink

49 Wire Bonding Chip Structure Merge Heat Source Sapphire : Al 2 O 3 Name Material Height Name Material Height Sapphire Al 2 O um P-Metal Ni / Au 0.3 um Protection SiO 2 - P-Electrode Ni / Au 2 um N-GaN GaN 4 um N-Metal Ni / Au 0.5 um MQW InGaN/GaN - N-Electrode Ti/Al/Pt/Au 2 um P-GaN GaN 0.12 um Reflector Ag 0.5 um

50 LTCC Design Drawing 3-D D View Top/Side View Material Dimension Layer No. Thickness Bonding Pad Soldering Pad Ceramic mm 2 1mm mm 5 5 mm

51 Reflector Design Drawing 3-D D View Top/Side View Material Dimension Angle Thickness Plating Copper 7 7 mm mm Silver

52 One of multi-arrayed structure Modeling Reflector LTCC Encapsulant Material Property LED Chip Ag Epoxy Beacon Heat Sink Modify Heat Source Sapphire : Al 2 O 3 Reflector LTCC Encapsulant LED Chip Paste Beacon Heat Sink Material Copper Ceramic Silicon Sapphire Ag Epoxy Aluminum Aluminum Thermal Conductivity

53 Modeling Heat Sink 3-D D View Top/Side View Index Value Index Value Type Extruded Thickness 1.8 mm Material Aluminum Space 2.34 mm Height Base Over 5mm 30mm Dimension Pin Count mm 17

54 Modeling Reflector Union of each part LTCC Dimension Size 49 mm 49 mm Metal Plate Reflector 3.4 mm Thickness LTCC Metal Plate 1 mm 3 mm Total 4 mm

55 Modeling Modeling of junction section between units Union Section Reflector & Heat Sink Sapphire & Beacon LTCC & Heat Sink Reflector & LTCC Material Ag Epoxy Ag Epoxy Ag Epoxy Ceramic Object Thin Plate Thin Plate Thick Plate Thin Plate

56 Contour Plot Temperature Distribution Electrical Power : 0.15W Three Dimensional View Cross-Sectional View SRC PWR Source Sapphire Beacon Deviation Max Min Max Mean Min Max Mean Min Max Mean Effective Dev

57 Temperature Distribution Contour Plot Electrical Power : 0.471W Three Dimensional View Cross-Sectional View SRC PWR Source Sapphire Beacon Deviation Max Min Max Mean Min Max Mean Min Max Mean Effective Dev

58 Temperature Distribution Contour Plot Electrical Power : 0.56W Three Dimensional View Cross-Sectional View SRC PWR Source Sapphire Beacon Deviation Max Min Max Mean Min Max Mean Min Max Mean Effective Dev

59 Temperature Distribution Contour Plot Electrical Power : 0.732W Three Dimensional View Cross-Sectional View SRC PWR Source Sapphire Beacon Deviation Max Min Max Mean Min Max Mean Min Max Mean Effective Dev

60 Temperature Distribution Contour Plot Electrical Power : 0.898W Three Dimensional View Cross-Sectional View SRC PWR Source Sapphire Beacon Deviation Max Min Max Mean Min Max Mean Min Max Mean Effective Dev

61 Temperature Distribution Contour Plot Electrical Power : 1.061W Three Dimensional View Cross-Sectional View SRC PWR Source Sapphire Beacon Deviation Max Min Max Mean Min Max Mean Min Max Mean Effective Dev

62 Temperature Distribution Contour Plot Electrical Power : 1.221W Three Dimensional View Cross-Sectional View SRC PWR Source Sapphire Beacon Deviation Max Min Max Mean Min Max Mean Min Max Mean Effective Dev

63 Re-Simulation of Non Finned Heat Sink Type Simulation Result Deviation between parts Actual Total PWR Mean Dev. Eff. Dev Rth_Mean Rth_Eff R th_eff Sapphire Beacon R th_mean R th_mean : (Mean. Temp. of Sapphire - Mean. Temp. of Beacon) / PWR R th_eff : (Max. Temp. of Sapphire - Min. Temp. of Beacon) / PWR Temperature of others Actual Total PWR Heat_Spreader LTCC Encapsulant Reflector

64 Conclusion

65 Chip / Package Level Effect of Current Spreading Conclusion Heat transfer rate obtained from the experiment results q = Power Electrical Thermal Resistance of Package Level Deviation Ratio [ 100 ( R + R )] Optical _ Power Loss _ Current _ Spreading Electrical PWR Simulation(K/W) Evaluation(K/W) Ratio(%) Error : within 10 % Multi_Chip Package Thermal Resistance Deviation between simulation results and evaluation results K/W(21%)

66 Conclusion Thermal paste thickness and property between Heat sink and Heat Spreader Need correlation and compensation Development Results Heat emission with only heat sink Determination of distance between HP LEDs Can be applied to lighting products

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