ImageVerifierCode 换一换
格式:PDF , 页数:18 ,大小:341.18KB ,
资源ID:807221      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-807221.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(JEDEC JESD51-52-2012 Guidelines for Combining CIE 127-2007 Total Flux Measurements with Thermal Measurements of LEDs with Exposed Cooling Surface.pdf)为本站会员(syndromehi216)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

JEDEC JESD51-52-2012 Guidelines for Combining CIE 127-2007 Total Flux Measurements with Thermal Measurements of LEDs with Exposed Cooling Surface.pdf

1、JEDEC STANDARD Guidelines for Combining CIE 127-2007 Total Flux Measurements with Thermal Measurements of LEDs with Exposed Cooling Surface JESD51-52 APRIL 2012 JEDEC SOLID STATE TECHNOLOGY ASSOCIATION NOTICE JEDEC standards and publications contain material that has been prepared, reviewed, and app

2、roved through the JEDEC Board of Directors level and subsequently reviewed and approved by the JEDEC legal counsel. JEDEC standards and publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability a

3、nd improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for use by those other than JEDEC members, whether the standard is to be used either domestically or internationally. JEDEC standards and publications are adopted without regard t

4、o whether or not their adoption may involve patents or articles, materials, or processes. By such action JEDEC does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the JEDEC standards or publications. The information included in JEDEC stan

5、dards and publications represents a sound approach to product specification and application, principally from the solid state device manufacturer viewpoint. Within the JEDEC organization there are procedures whereby a JEDEC standard or publication may be further processed and ultimately become an AN

6、SI standard. No claims to be in conformance with this standard may be made unless all requirements stated in the standard are met. Inquiries, comments, and suggestions relative to the content of this JEDEC standard or publication should be addressed to JEDEC at the address below, or refer to www.jed

7、ec.org under Standards and Documents for alternative contact information. Published by JEDEC Solid State Technology Association 2012 3103 North 10th Street Suite 240 South Arlington, VA 22201-2107 This document may be downloaded free of charge; however JEDEC retains the copyright on this material. B

8、y downloading this file the individual agrees not to charge for or resell the resulting material. PRICE: Contact JEDEC Printed in the U.S.A. All rights reserved PLEASE! DONT VIOLATE THE LAW! This document is copyrighted by JEDEC and may not be reproduced without permission. Organizations may obtain

9、permission to reproduce a limited number of copies through entering into a license agreement. For information, contact: JEDEC Solid State Technology Association 3103 North 10th Street Suite 240 South Arlington, VA 22201-2107 or refer to www.jedec.org under Standards and Documents for alternative con

10、tact information. JEDEC Standard No. 51-52 -i- GUIDELINES FOR COMBINING CIE 127-2007 TOTAL FLUX MEASUREMENTS WITH THERMAL MEASUREMENTS OF LEDS WITH EXPOSED COOLING SURFACE CONTENTS Foreword. ii Introduction. ii 1 Scope. 1 2 Normative references 1 3 Terms, definitions, and notations 2 4 Recommended t

11、est environment for LEDs. 3 4.1 General recommendations for measuring the light output 4 4.2 Combined thermal and radiometric LED testing station 6 5 Data reporting . 8 6 Bibliography . 8 JEDEC Standard No. 51-52 -ii- GUIDELINES FOR COMBINING CIE 127-2007 TOTAL FLUX MEASUREMENTS WITH THERMAL MEASURE

12、MENTS OF LEDS WITH EXPOSED COOLING SURFACE Foreword This document has been prepared by the JEDEC JC-15 Committee on Thermal Characterization. It provides guidelines on the implementation of the light output measurement of power LEDs when used in combination with thermal characterization. Introductio

13、n This document is intended to be used in conjunction with the JESD51-50 series of standards, especially with JESD51-51 (Implementation of the Electrical Test Method for the Measurement of Real Thermal Resistance and Impedance of Light-emitting Diodes with Exposed Cooling Surface) document. This pre

14、sent document focuses on the measurement of the total radiant flux of LEDs in combination with the measurement of LEDss thermal characteristics: guidelines on the implementation of the recommendations of the CIE 127-2007 document are provided. Terms and definitions of the JESD51-53 (Terms, Definitio

15、ns and Units Glossary for LED Thermal Testing) document are used here in a way consistent with the relevant definitions of CIE the International Committee of Illumination, given in CIE S 017/E:2011 ILV, CIE 127:2007, CIE 84:1989, and other standards used in the solid-state lighting industry, e.g., A

16、NSI/IESNA RP-16-10. The reason why these guidelines are provided is that the physics determining LEDss light output characteristics is rather complex, which requires special care both in thermal characterization and during light output measurements. The need for measurement guidelines for LEDs has a

17、risen when light-emitting diodes with high power and high energy conversion efficiency emerged. Figure 1 The mutual dependence of LEDss light output and different (macroscopic) quantities characteristic to LEDss operating conditions : Light output IF: Forward current VF: Forward voltage PH: Dissipat

18、ed heating powerTJ: Junction temperature JEDEC Standard No. 51-52 -iii- Introduction (contd) This complexity in the physics as illustrated in Figure 1 becomes manifest in the following: Light output of LEDs is primarily determined by the recombination processes taking place in the pn-junction. The h

19、igher the ratio of the radiative recombination with respect to the non-radiative recombination, the more photons are generated, hence the electrical energy to light conversion efficiency of the LEDs is higher. This ratio is determined by the operating conditions of the LED: the junction temperature

20、and the applied forward current. This efficiency is not a single number because it depends both on the LEDs junction temperature and forward current (as shown in Figure 2). The power dissipated at the active region of an LED is thus determined by the difference between the supplied total electrical

21、energy (VF IF) and the total energy emitted as optical radiation (e emitted total radiant flux, also denoted as Popt): PH= VF IF e(1) This power together with the thermal resistance of the LED determines the junction temperature. For the end-users of the LEDs, the manifestation of this complex and t

22、emperature dependent physics of LEDss operation is the change of the properties of the emitted light: drop in the emitted luminous flux, shift of peak wavelength of the spectrum, and the change of the spectral power distribution of the emitted light (such as shown in Figure 3) resulting also in the

23、chnage of other characteristics of the emitted light. Figure 2 Temperature and forward current dependence of the energy conversion efficiency (also known as radiant efficiency) of a power LED (Popt/Pel emitted optical power / electrical power) 1000IFforward current mA100 200 400 500 700 80010 15 20

24、25 30 eradiant efficiency %Tref = 15oC Tref = 25oC Tref = 35oC Tref = 45oC Tref = 55oC Tref = 65oC 300 600 900 JEDEC Standard No. 51-52 -iv- Introduction (contd) Spectral distribution of light output of a 1W red LED at different current levels and different temperatures00.0020.0040.0060.0080.010.012

25、570 584 598 611 625 638 652 665 678 692 705 719Wavelength nmSpectralintensity W/nmT25_I200T25_I500T50_I200T50_I500T75_I200T75_I500Figure 3 Temperature dependence of spectral distribution of the light output a red LED at different current levels JEDEC Standard No. 51-52 Page 1 GUIDELINES FOR COMBININ

26、G CIE 127-2007 TOTAL FLUX MEASUREMENTS WITH THERMAL MEASUREMENTS OF LEDS WITH EXPOSED COOLING SURFACE (From JEDEC Board Ballot JCB-12-09, formulated under the cognizance of the JC-15 Committee on Thermal Characterization.) 1 Scope These guidelines specify testing procedures and conditions for power

27、light-emitting diodes (power LEDs) and/or high brightness light-emitting diodes (HB LEDs) in the following referred to as LEDs which are typically used in the operating regime of the forward current of 100mA and above, and emit visible light1). The application of these guidelines is recommended for

28、packaged LEDs 1. with a total electrical power consumption above 0.5 W, 2. which have energy conversion efficiency above 5%, 3. that are measured and considered as a single light source. This document is restricted to LEDs which have an exposed cooling surface. Guidelines provided here refer to labo

29、ratory measurements. Issues of high speed bulk measurements of LEDs (such as in-line testing aimed for, e.g., binning) are dealt with by other standardization bodies such as the relevant technical committees of CIE. Recommendations given in this document are valid for LEDs powered by DC forward curr

30、ent only. Measurement issues of AC power driven LEDs will be dealt with in future documents. 2 Normative references The following normative documents contain provisions that, through reference in this text, constitute provisions of this guideline. For dated references, subsequent amendments to, or r

31、evisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative docume

32、nt referred to applies. JESD51-50, Overview of Methodologies for the Thermal Measurement of Single- and Multi-Chip, Single- and Multi-PN-Junction Light-Emitting Diodes (LEDs). JESD51-51, Implementation of the Electrical Test Method for the Measurement of Real Thermal Resistance and Impedance of Ligh

33、t-emitting Diodes with Exposed Cooling Surface. JESD51-53, Terms, Definitions and Units Glossary for LED Thermal Testing. CIE S 017/E:2011 ILV, International Lighting Vocabulary. 1)Strictly speaking, the term LED should only be applied to those diodes which emit visible light. Those, which emit infr

34、a red or UV radiation, should be referred to as IR LEDs or UV LEDs and are not dealt with in this document. JEDEC Standard No. 51-52 Page 2 2 Normative references (contd) CIE 127:2007, Technical Report, Measurement of LEDs, ISBN 978 3 901 906 58 9. CIE 84:1989, Technical Report, The measurement of l

35、uminous flux, ISBN 978 3 900734 21 3. ANSI/IESNA IES Nomenclature Committee, IES RP-16-10, Nomenclature and Definitions of for Illuminating Engineering, ISBN 978-0-87995-208-2 3 Terms, definitions, and notations In this document the notations used in JESD51-50, which is the overview document for the

36、 JESD51-51 through JESD51-53 series of standards, and in JESD51-51 are applied. Generic terms and quantities related to light output measurement are used as defined in the International Lighting Vocabulary, CIE S 017/E:2011; LED specific terms of photometry and radiometry given in CIE 127:2007are al

37、so used. The most important terms and notations referred to in the series of LED thermal testing documents are listed in Table 1. For terms and definitions not listed below refer to JESD51-53. Table 1 Symbols used in this document Symbol Unit of measure Name, description TJoC junction temperature of

38、 the LED as defined in JESD51-50 and JESD51-51, denoted and referred to in CIE 127:2007 as TC, the chip temperature. (In the temperature range of interest using oC is more common.) TJoC or K change of junction temperature (see JESD51-50). For temperature differences oC is commonly used. VFV junction

39、 forward voltage IFA junction forward current PHW heat dissipated at the junction of the LED(see JESD51-50), also denoted as PHand referred to as heating power in JESD51-51. PoptW emitted optical power of the LED referred to as total radiant flux and denoted as ein CIE S 017/E, 2011 ILV. It is also

40、called total radiant power. PelW electrical power supplied to the LED which is equal to the product of the forward voltage and the forward current: Pel= VF IF. This quantity is denoted as P in CIE 127:2007. eW emitted optical power of the LED, alternate notation to Poptas defined and referred to in

41、CIE S 017/E, 2011 ILVas total radiant flux or radiant power. Vlm total luminous flux nm wavelength of the emitted light S() W/nm spectral power distribution indicating the radiant power of the emitted light at a given wavelength. e, WPE % radiant efficiency or energy conversion efficiency or wall pl

42、ug efficiency of the LED: 100 the value of the Poptemitted optical power divided by the Pelsupplied electrical power. Throughout this document WPE is defined for a single LED device. Vlm/W efficacy, the LEDs total luminous flux Vdivided by the Pelsupplied electrical power. ZJX, ZthJXK/W junction-to-

43、specific environment thermal impedance, the temporal change of junction temperature with respect to temperature of environment X, normalized to 1W heating power and scaled in z logarithmic time. IMmA value of the forward current of the LED applied as measuring current. IHmA value of the forward curr

44、ent of the LED applied as heating current. JEDEC Standard No. 51-52 Page 3 3 Terms, Definitions, and notations (contd) The everyday term (high) power LED is somewhat ambiguous, since there is a tendency to package multiple single pn-junction LED chips into a single package (sharing the same cooling

45、assembly and optics) or have multiple elementary pn-junctions on a single chip form an LED device. Also, in many cases, multiple packaged LEDs are assembled to a substrate (usually a high thermal conductivity board such as a metal core PCB or MCPCB in short) to form one single device. In this docume

46、nt, the phrase “LED” means a device used as a single light source with a generic anode and cathode electrical contact. All measured characteristics (e.g., thermal resistance, temperature sensitivity of the overall forward voltage, radiant flux, luminous flux, color, etc.) of array type single light

47、source LED devices are ensemble characteristics of the array. In such cases the array is considered a single chip equivalent device which possesses the measured ensemble characteristics of the array device. In the subsequent sections under term LED (or power LED) or LED device, it is meant either as

48、 an individually available single LED of any LED array arrangement or an equivalent LED of an LED array where elements of the array are not accessible individually, (this equivalent LED being characterized by its ensemble characteristics). Either configuration would have an exposed cooling surface w

49、hich is to be heat-sunk during normal operation. Regarding the term LED see also definition 6.8.5.1 of LED packages and definition 6.8.5.2 of the LED arrays in ANSI/IESNA RP 16-05 Addendum A. The scope of this document does not include any other solid-state lighting device defined in ANSI/IESNA RP 16-05 Addendum A. 4 Recommended test environment for LEDs As a reference environment for thermal and light output measurement of LEDs, temperature controlled cold-plates are recommended. Su

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1