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、灯具总效率对照：（光源发展的历史：白炽灯→直管型荧光灯→高效电子节能灯→LED 灯）综上，各种光源灯具的实际效率：LED 计算：90*0.90*0.90*0.9=65.6流明/ 瓦荧光灯计算：80*0.85*0.6*0.6=24.5流明/ 瓦普通灯泡计算：20*1*0.6*0.6=7.2流明/ 瓦高压钠灯计算：100*0.9*0.60*0.60=32.4流明/ 瓦可见，LED 灯具实际效率是一般荧光灯的2.6倍，是普通白炽灯泡的9 倍，是高压钠灯的2.02 倍。
即：LED 灯钠灯之间功率可换算为：75W LED 灯=150W钠灯；125W LED 灯=250W钠灯；225W LED 灯=400W 钠灯二、LED 商用、民用光源使用效益分析表LED 办公、商用照明灯使用适用场所：采用光源：LED 球泡、管灯、广告灯箱、广告霓虹灯适合：家庭照明、酒店、办公室、娱乐场所、餐饮、工厂、医院改进场所：1）家庭照明、酒店餐饮、娱乐场所：办公室照明、大厅照明、餐厅照明、客房照明、走廊照明、会议室照明、厨房照明、卫生间照明、门前照明、景观照明。
2）工厂：办公室、车间、实验室、工作间、卫生间照明。
1、节省预算：1）寿命长节能灯的寿命一般在1800小时，按照每天10小时照明计算为180天。
LED 灯的寿命为7 万小时，按照每天照明10小时为7000天（20年）。
如果按照一个14W 节能灯平均12元来计算20年内要换40个灯泡（480元）。
一个L ED 灯泡5W 为平均70 元，总计节省410元。
2 ）省电一个40W的普通灯泡每小时耗电0.04度*0.8 元=0.032元40W灯泡=5W LED 每小时耗电0.005度*0.8=0.004元每小时可节省0.028元*10小时/ 天*365天=102.2元（对比一个灯泡一年节省的费用）★实例：1000盏40W白炽灯与1000盏5WLED 灯光源费用对比：（每天平均使用10小时）一盏40W 白炽灯：一年耗电：0.04*10*365=146度.电费：146*0.8=116.8元/ 年1000盏40W白炽电费：116.8元*1000=116800元/ 年灯：一盏5WLED 灯：一年耗电：0.005*10*365=18.25度电费：18.25*0.8=14.6元/ 年1000盏5WLED电费：14.6*1000=14600元/ 年灯：节省电费总额：102，200元/年2、其它优点：不产生光污染和热辐射且色彩丰富逼真、图形多变，显色指数高免维护易控制环保,无紫外线对人体无害三、LED 路灯光源使用效益分析表四、公园节电改造方案目前在公园的照明方面，不管是公园道路灯还是景观灯或者草坪灯，大部分采用的是节能灯泡进行照明，但是就目前来讲存在2 大问题：（一）、寿命短，要长期频繁更换。
111 Product Family Data Sheet Rev. 1.1 2020.05.04Features∙Package : Silicone covered Amber LED package∙Dimension : 1.4 mm x 1.8 mm∙Chip Configuration : 1 chip∙ESD Voltage : Up to 8 kV acc. to ISO 10605-contact∙Viewing Angle: 120˚∙Qualifications: The product qualification test based on the guidelines of AEC-Q102.Table of Contents1. Characteristics ----------------------- 32. Product Code Information ----------------------- 43. Typical Characteristics Graphs ----------------------- 74. Soldering Temperature Location ----------------------- 115. Mechanical Dimension ----------------------- 126. Soldering Conditions ----------------------- 137. Tape & Reel ----------------------- 148. Label Structure ----------------------- 159. Packing Structure ----------------------- 1610. Precautions in Handling & Use ----------------------- 1711. Company Information ----------------------- 181. Characteristicsa) Typical Characteristics[T S=25℃][1] Item Symbol Value Unit. Luminous Flux (I F = 1,000 ㎃) ΦV Typ. 210 ㏐Forward Voltage (I F = 1,000 ㎃) V F Typ. 3.0 VViewing Angle ΦTyp. 120 ºReverse Current I R Not designed for reverseoperationReal Thermal Resistance (Junction to Solder point) R th_J-S (Real)Typ. 5.3K/WMax. 5.9Electrical Thermal Resistance (Junction to Solder point) R th_J-S (Elec.)Typ. 4.5K/WMax. 5.0Radian Surface A 1.21 ㎟Note:[1] The measurement condition means that temperature dependence is excluded by applying pulse current for typically 25㎳.b) Absolute Maximum RatingItem Symbol Rating Unit Ambient / OperatingTemperatureT a-40 ~ +125 ºC Storage Temperature T stg-40 ~ +125 ºC LED Junction Temperature T j150 ºC Maximum Forward current[2](T S:25℃) [3]I F1,200 ㎃Minimum Forward current[2](T S:25℃) [3]I F50 ㎃Maximum Reverse currentDo not apply for reverse currentESD Sensitivity[4]- ±8 for HBM kVNote:[2] Driving the product at forward current (IF) below Min. IF or above Max. IF may result in unpredictable behavior of the product.[3] The measurement condition means that temperature dependence is excluded by applying pulse current for typically 25㎳[4] It is included the device to protect the product from ESD.2. Product Code Information1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18S P H A M T A 1 N 3 C 0 A B C D E F Digit PKG Information1 2 company name and Samsung LED PKG (SP for Samsung PKG)3 power variant (H for automotive high power)4 5 color variant (AM for automotive Amber color)6 LED PKG version (T for initial version )7 8 product configuration and type (A1 for automotive 1814 PKG type)9 lens configuration (N for no lens)10 Max power (3 for 3±0.5W)11 12 specific property (C0 for FX Series)13 14 forward voltage property15 16 CIE coordination property17 18 luminous flux propertya) Luminous Flux Bins [5] (I F= 1,000 ㎃, T S= 25 ºC)Symbol Flux Bin CodeFlux Range (㏐)Min MaxΦV P2 160 180 R2 180 200 T1 200 220 U1 220 240b) Voltage Bins [5] (I F= 1,000 ㎃, T S= 25 ºC)Symbol Bin CodeVoltage Range (V)Min MaxV F C5 2.50 3.00 H5 3.00 3.50Note:[5] Luminous flux measuring equipment: CAS140CTΦV and V F tolerances are ±7% and ±0.1V, respectively.c) Color Bins [6] (I F= 1,000 mA)Symbol Color Bin Code Cx CyCx, Cy L0 0.5760 0.5490 0.5620 0.5890 0.4070 0.4250 0.4380 0.4110Note[6] Chromaticity coordinates: C x, C y according to CIE 1931. C x and C y tolerances are ±0.005, respectively.3. Typical Characteristics Graphsa) Spectrum Distribution (I F = 1,000 mA, T s = 25 ºC) [7]b) Typical Chromaticity Coordinate Shift vs Radiation Angle (I F = 1,000 mA, T s = 25 ºC) [7]Note:[7] The measurement condition means that temperature dependence is excluded by applying pulse current for Typically 25ms.0.00.20.40.60.81.01.2380430480530580630680730780R e l a t i v e i n t e n s i t yWavelength0.0000.0250.0500.0750.100-80-60-40-2020406080C h r o m a t i c i t y C o o r d i n a t e S h i f tRadiation AngleΔCx ΔcyW dW d(max)λ[㎚]∆C x , ∆C yφ[º]c) Forward Current Characteristics (T s = 25 ºC) [8]Note:[8] The measurement condition means that temperature dependence is excluded by applying pulse current for typically 25ms.0.00.40.81.21.62.003006009001,200R e l a t i v e L u m i n o u s F l u xForward Current0.00.40.81.21.62.003006009001,200R e l a t i v e F o r w a r d V o l t a g eForward Current-0.010-0.0050.0000.0050.01003006009001200C h r o m a t i c i t y C o o r d i n a t e S h i f tForward CurrentΔCx ΔCyI v I v(1000mA)V F V F(1000mA)∆C x , ∆C yI F [㎃]I F [㎃]I F [㎃]d) Temperature Characteristics (I F = 1,000 mA)0.50.60.70.80.91.01.11.2-40-20020406080100120140R e l a t i v e L u m i n o u s F l u xTemperature0.50.60.70.80.91.01.11.2-40-2020406080100120140R e l a t i v e F o r w a r d V o l t a g eTemperature-0.050-0.0250.0000.0250.050-40-20020406080100120140C h r o m a t i c i t y C o o r d i n a t e S h i f tTemperatureCx CyI v I v(25℃)V F V F(25℃)∆C x , ∆C yT j [ºC]T j [ºC]T j [ºC]e) Derating Curve [9]Note:[9] The measurement condition means that temperature dependence is excluded by applying pulse current for typically 25ms.f) Beam Angle Characteristics (I F = 1,000 mA, T s = 25 ºC)0.00.20.40.60.81.01.21.40102030405060708090100110120130140F o r w a r d C u r r e n tTemperature 0.00.20.40.60.81.01.2-90-80-70-60-50-40-30-20-10102030405060708090R e l a t i v e L u m i n o u s F l u xRadiation Angleφ[º]I v Iv(0º)I F [A]T S [ºC]4. Soldering Temperature LocationT j: Temperature of JunctionT S: Temperature of Solder PadR th_J-S: Thermal Resistance from Junction to Solder Pad5. Mechanical DimensionNote:The dimensions in parentheses are for reference purposes. Notes: Unit: mm, Tolerance: ±0.1mm, Approximate Weight : 4.8mga) Pick and PlaceDo not place pressure on the resin molded partIt is recommended to use a pick & place nozzle AM03-024820A(Hanhwa Techwin), etc.b) Electric Schematic Diagramc) Material InformationDescriptionMaterialSubstrate Cu Lead FrameLED Die Flip Chip Phosphor Phosphor Zener DiodeSilicon Wire Au Resin MoldSiliconeTolerance: ±0.1㎜① ②① Cathode pad ② Anode pad6. Soldering Conditionsa) Pad Configuration & Solder Pad LayoutNotes: ㎜, Tolerance : ±0.10㎜, recommended stencil thickness 120㎛b) Reflow Conditions (Pb free)Reflow frequency: 2 times max.c) Manual Soldering ConditionsNot more than 5 seconds @ max 300 ºC, under soldering iron. (One time only)7. Tape & Reela) Taping DimensionNote:Unit: ㎜, LED taping quantity: 3,000ea (1 Reel)b) Reel DimensionNotes:Unit: ㎜, Tolerance: ±0.2㎜User feed direction →ABCDEFSPHAMTA1N3C0XXXXXX YYYYYY II I IIIIIII I IIIIIII III III II IIIIII I IIIIIII I IIIIIIIISLAAC4001 / I001 / 3,000 pcs IIIIII I IIIIIII III IIII I III I III I III III IIIIIIBin CodeProduct CodeLot NumberABCDEFSPHAMTA1N3C0XXXXXX YYYYYY 01 II I IIIIIII I IIIIIII III III II IIIIII I IIIIIII I IIIIIIII①②③④⑤⑥⑦⑧⑨/1ⓐⓑⓒ/ 3,000 pcs IIIIII I IIIIIII III IIII I III I III I III III IIIIII8. Label Structurea) Label StructureNote: Denoted bin code and product code above is only an example (see description on page 5)Bin Code:ⓐⓑ: Forward Voltage bin (refer to page 5) ⓒⓓ: Chromaticity bin (refer to page 6) ⓔⓕ: Luminous Flux bin (refer to page 5)b) Lot NumberThe lot number is composed of the following characters:①②③③②③④⑤⑥⑦⑧⑨ / I ⓐⓑⓒ / 3,000 pcs ①② :Production site③ : Product state (A: Normal, B: Bulk, C: First Production, R: Reproduction, S: Sample) ④ : Year (D: 2019, E: 2020, F: 2021…) ⑤ : Month (1~9, A, B, C) ⑥ : Day (1~9, A, B~V) ⑦⑧⑨: Serial number (001 ~ 999)ⓐⓑⓒ : Product serial number (001 ~ 999)ⓐⓑⓒⓓⓔⓕ9. Packing Structurea) Packing ProcessDimension of Transportation Box in ㎜Width Length Height220 245 18210. Precautions in Handling & Use1)For over-current-proof function, customers are recommended to apply resistors to prevent suddenchange of the current caused by slight shift of the voltage.2)This device should not be used in any type of fluid such as water, oil, organic solvent, etc. Whenwashing is required, IPA is recommended to use.3)When the LEDs illuminate, operating current should be decided after considering the ambientmaximum temperature.4)LEDs must be stored in a clean environment. If the LEDs are to be stored for 3 months or moreafter being shipped from Samsung Electronics, they should be packed by a sealed container withnitrogen gas injected.(Shelf life of sealed bags: 12 months, temp. ~40℃, ~90% RH)5)After storage bag is open, device subjected to soldering, solder reflow, or other high temperatureprocesses must be:a. Mounted within 672 hours (28 days) at an assembly line with a condition of no more than30℃/ 60% RH.b. Stored at <10% RH.6)Repack unused products using anti-moisture packing, fold to close any openings and store in a dryplace with <10% RH7)Devices require baking before mounting, if humidity card reading is >60% at 23±5℃.8)Devices must be baked for 1 day at 60±5℃, if baking is required.9)The LEDs are sensitive to the static electricity and surge. It is recommended to use a wrist band oranti-electrostatic glove when handling the LEDs. If voltage exceeding the absolute maximum ratingis applied to LEDs, it may cause damage or even destruction to LED devices. Damaged LEDs mayshow some unusual characteristics such as increase in leak current, lowered turn-on voltage, orabnormal lighting of LEDs at low current.10)VOCs (volatile organic compounds) may be occurred by adhesives, flux, hardener or organicadditives which are used in luminaires (fixture) and LED silicone bags are permeable to it. It maylead a discoloration when LED expose to heat or light. This phenomenon can give a significant lossof light emitted (output) from the luminaires (fixtures). In order to prevent these problems, werecommend you to know the physical properties for the materials used in luminaires, it requiresselecting carefully.11)Risk of Sulfurization (or Tarnishing)The lead frame from Samsung Electronics is a plated package and it may change to black(or darkcolored) when it is exposed to Ag (a), Sulfur (S), Chlorine (Cl) or other halogen compound. Itrequires attention.Sulfide (Sulfurization) of the lead frame may cause a change of degradation intensity, chromaticitycoordinates and it may cause open circuit in extreme cases. It requires attention.Sulfide (Sulfurization) of the lead frame may cause of storage and using with oxidizing substancestogether.Therefore, LED is not recommend to use and store with the below list. : Rubber, Plain paper, leadsolder cream etc.11. Company Information/ledAbout Samsung Electronics Co., Ltd.Samsung inspires the world and shapes the future with transformative ideas and technologies. The company is redefining the worlds of TVs, smartphones, wearable devices, tablets, digital appliances, network systems, and memory, system LSI, foundry and LED solutions. For the latest news, please visit the Samsung Newsroom at .Copyright © 2018 Samsung Electronics Co., Ltd. All rights reserved.Samsung is a registered trademark of Samsung Electronics Co., Ltd.Specifications and designs are subject to change without notice. Non-metricweights and measurements are approximate. All data were deemed correctat time of creation. Samsung is not liable for errors or omissions. All brand, product, service names and logos are trademarks and/or registered trademarks of theirrespective owners and are hereby recognized and acknowledged.Samsung Electronics Co., Ltd.95, Samsung 2-roGiheung-guYongin-si, Gyeonggi-do, 446-711KOREA/led。
室内照度计算公式：
N*F=E*A/（LLD*LDD*CU）
=E*A/（M*CU）
N:灯具之总数
E:设计照度目标（Lux)
A:面积（平方米）
F:每盏灯的裸光源光通量（lm）
LLD：灯具的流明减少率
LDD：灯具积尘较少率
CU：LED利用系数
M:维护系数，一般空间设定为0.8
维护系数M（0.8-0.6）：
客厅、卧室、办公室、教室、阅读室、医院、高级品牌专卖店、艺术馆、博物馆等维护系数M取0.8;
一般性的商店、超市、营业厅、影剧院、机械加工车间、车站等场所维护系数M取0.7;
污染指数较大的场所维护系数M则可取到0.6左右
利用系数CU（0.7-0.45）：
空间利用系数(CU)，是指从照明灯具放射出来的光束有百分之多少到达地板和作业台面,所以与照明灯具的设计、的大小和反射率的不同相关,照明率也随之变化。
如常用灯盘在3米左右高的空间使用，其利用系数CU可取0.6--0.75之间；
而悬挂灯铝罩，空间高度6--10米时，其利用系数CU取值范围在0.7--0.45；
筒灯类灯具在3米左右空间使用，其利用系数CU可取0.4--0.55；
而像光带支架类的灯具在4米左右的空间使用时，其利用系数CU可取0.3--0.5。
空间越宽大，CU就越高；配光越窄CU也越高；，例如瘦高的“烟囱楼”，CU就很低，需要配光窄的灯具
护系数M取0.8;
7;
面,所以与照明灯具的设计、安装高度、房间低，需要配光窄的灯具。
LED灯的热功耗计算人眼对波长为555nm的光最敏感，而1W的该光的光通量是683lm。
LED的供应商已经通过积分球测出了某个型号的LED的光通量，可以在说明书上找到。
至于发光效率而言，应该是：e=光通量/功率/683，这个值应该随着温度的升高而降低（因为节温升高，发光效率应该降低）。
这样，就可以计算出LED灯的热功耗：功率*（1-e）。
白光LED的光效极限≈683lm/W是错误的。
（供应商分选LED一般是25℃，光通测试只是瞬间的事，更别谈随温度和时间的光衰了。
）显色指数R≈70~80时，光效的理论极限也不到683lm/W的一半。
能做到300lm/w就基本是光源的极限了，这是无法超越的，对所有的光源都一样（HID、LED、OLED等等）。
可参见光电源专家、东南大学教授杨正名先生对此的论文“灯具光效分析”一文（《电气照明》2009年第六期）。
考虑量子转化率、芯片结构器件的影响，LED光效就更低一点（仅仅是芯片的光效）。
LED光源本身的辐射通量很小，不像其他传统光源，所以LED的生热率极高。
比如：VF=3.5V、IF=350mA的冷白LED光源，标称光通量Ψ=90lm~95lm，生热率ξ≈78%~81%。
即：标称光效70lm/W的LED生热率约80%。
LED灯具一般内置电源，仿真时还要考虑恒流(压)源的效率及其发热，现在的转换效率基本在80%左右，有的还不到。
综上所述：现阶段10W的LED灯具能做到700lm就很不错了。
这10W 的灯具消耗功率中就有一半左右的LED发热、也有1W以上的电源发热(电源发热也是个不小的参量啊！)5楼说理论极限光效率也没错，这个效率是指1W的功率全部转换成电磁波的时候可以产生的683lm电磁波通量，这个通量里包含所有波长的电磁波，可见光只是其中的一部分，热量也只是电磁波在自然界中的一种物理表现形态而已，这个理论值是经过严格的理论推算的，不会错。
其实从另外一个角度来说，把5楼和6楼的说法综合起来就会出现一个结果，那就是，理论上，目前的LED粒子结构把输入电功率转换成可见光功率的理论最大值不大于400lm/w（具体好像是380左右，我记不清了），也就是说，LED粒子在最理想的情况下，约有一半的输入功率能够转化成可见光；从散热的角度上讲，LED粒子在最理想的情况下也会有将近一半的输入电功率转化成热量。
LED平均照度计算方法照度计算方法利用系数法此方法用于计算平均照度 = (光源光通量)×(CU)×(MF)÷照射区域面积适用于室内，体育照明利用系数：一般室内取0.4，体育取0.31. 灯具的照度分布2. 灯具效率3. 灯具在照射区域的相对位置4. 被包围区域中的反射光维护系数MF=(LLD)X(LDD)一般取0.7～0.8举例 1：室内照明，4×5米房间，使用 3×36W隔栅灯 9 套平均照度＝光源总光通×CU×MF/面积法向照度标准计算照度标准值应按0．5、1、3、5、10、15、20、30、50、75、100、150、200、300、500、750、1000、1500、2000、3000、50001x分级。
本标准规定的照度值均为作业面或参考平面上的维持平均照度值。
体育运动场地照度标准值表2.2.9-1运动项目参考平面及其高度照度标准值(lx)训练比赛低中高低中高篮球、排球、羽毛球、网球、手球、田径(室内)、体操、艺术体操、技巧、武术地面150200300300500750棒球、垒球地面---300500w50保龄球地面150200300200300500举重地面100150200300500750击剑台面200300500300500750柔道、中国摔交、国际摔交地面200300500300500750拳击地面200300500100015002000乒乓球台面3005007505007501000游泳、蹼泳、跳水、水球水面150200300300500750花样游泳水面200300500300500750冰球、速度滑冰、花样滑冰冰面150200300300500750围棋、中国象棋、国际象棋台面---5007501000桥牌桌面---100150200射击靶心靶心垂直面100015002000100015002000射击房地面5010015050100150足球曲棍球观看距离120m地面---150200300160m---200300500200m---300500750利用系数法（此方法用于计算平均照度）计算公式：平均照度＝光源总光通×CU×MF/面积平均照度：指于工作面上接受之入射光通量密度；光源总光通：点光源或非点光源在单位时间内所发出的能量,其中可产生视觉者(人能感觉出来的辐射通量)即称为光通量。
LED显示屏各种参数计算方法LED显示屏（LED panel）：LED就是light emitting diode ，发光二极管的英文缩写，简称LED。
它是一种通过控制半导体发光二极管的显示方式，一种平板显示器，由一个个小的LED模块面板组成。
其大概的样子就是由很多个通常是红色的发光二极管组成，靠灯的亮灭来显示字符。
用来显示文字、图形、图像、动画、行情、视频、录像信号等各种信息的显示屏幕。
一、显示屏大小的计算方式1．室内显示屏的计算方式（1）给出屏的具体数据（长、宽，面积）。
a.例子：所做屏的规格是Φ5(指像素的直径)屏，屏长5.8米，宽2.6米。
b.首先，清楚Φ5屏的技术参数单元板规格为480×480mm，单元板解析度96×96 （不同的生产厂家的单元板规格和解析度是不一致的，我们以锐拓的单元板规格为例）单元板的解析度的算法：1平方Φ5屏的像素点=1000000÷5÷5=40000注：这里的1000000实际上就是1000×1000，40000=200×200 也就是说1000mm的长度上有200个像素点，那么480mm就应该有480÷1000×200=96 所以单元板的解析度为96×96c.计算所用单元板的块数。
屏长或宽用的板数＝预做屏长或宽÷单元板的长或宽屏长用的板数：5.8米×1000÷480=12.08≈12屏宽用的板数：2.6米×1000÷480=5.41≈5d.计算实际的屏的大小。
实际屏长或宽用＝单元板的长或宽×屏长或宽用的块数实际屏长：480×12=5760mm 即 5.760米实际屏宽：480×5=2400mm 即2.4米 e.屏的面积：5.760×2.4=13.824(平方米) 注：通常清况屏体外边框尺寸在屏体尺寸基础上每边各加5-10cm。
SF6020PFEATURES◆Proprietary NC-Cap/PSR-II TM Control:●±4% CC and CV Precision●Proprietary “Audio Noise Cancellation”Control● Built-in “Fast Dynamic Response” Control toMeet USB Charge Requirements● Proprietary “Zero-Output Startup” Control● Proprietary “Smart Output Short Protection”●without External Compensation/FilteringCapacitor Needed● Max. 50V Output for AC/DC LED Lighting◆Direct Drive of Low Cost BJT◆Proprietary Cable Drop Compensation◆Multi Mode Control◆Wide VDD Operating Range◆11.7V UVLO Hysteresis Window◆Cycle-by-Cycle Current Limiting◆Leading Edge Blanking (LEB)◆Built-in Soft Start, Pin Floating Protection◆VDD UVLO, OVP & ClampAPPLICATIONS◆Battery chargers◆Replaces linear transformer and RCC SMPS◆Small power adapter◆AC/DC LED lighting GENERAL DESCRIPTIONSF6020P is a high performance, highly integrated DCM (Discontinuous Conduction Mode) Primary Side Regulation (PSR) controller for offline small power converter applications. It can achieve less than ±4% CV/CC precision.SF6020P has built-in proprietary NC-Cap/PSR-II TM control for CV control, which eliminates external compensation or filtering capacitor. It has built-in cable drop compensation function, which can provide excellent CV performance. The IC uses Multi Mode Control to improve efficiency and reliability and to decrease audio noise energy @ light loadings.SF6020P integrates proprietary “Audio Noise Cancellation” control for audio noise free operation. The IC has built-in “Fast Dynamic Response” control to meet USB Charge requirements. SF6020P also integrates proprietary “Zero-Output Startup” control to achieve startup when output is near zero voltage. The IC has proprietary “Smart Output Short Protection”, which can protect the system with large leakage inductance when output is short circuit.SF6020P integrates functions and protections of FB Short Protection, Under Voltage Lockout (UVLO), VDD Over Voltage Protection (VDD OVP), Soft Start, Cycle-by-cycle Current Limiting (OCP), Pin Floating Protection, VDD Clamping.SF6020P is available in SOT23-5 package.NC-Cap/PSR-II TM (Primary Side Regulation) CV/CC ControllerBlock DiagramAbsolute Maximum Ratings(Note 1)Parameter Value Unit VDD DC Supply Voltage30 V VDD DC Clamp Current 10 mA CS, BASE voltage range -0.3 to 7 V FB voltage range -0.7 to 7 V Package Thermal Resistance (SOT-23-5) 300 o C/W Maximum Junction Temperature 150 o C Operating Temperature Range -40 to 85 o C Storage Temperature Range -65 to 150 o C Lead Temperature (Soldering, 10sec.) 260 o C ESD Capability, HBM (Human Body Model) 3 kV ESD Capability, MM (Machine Model) 250 VELECTRICAL CHARACTERISTICSONote 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied.Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2. The device is not guaranteed to function outside its operating conditions.CHARACTERIZATION PLOTSOPERATION DESCRIPTIONSF6020P is a high performance, highly integrated DCM (Discontinuous Conduction Mode) Primary Side Regulation (PSR) controller. The built-in high precision CV/CC control makes it very suitable for offline small power converter applications.◆ PSR Technology IntroductionAssuming the system works in DCM mode, thedem S SPpk o T f N I I ××××=2(Eq.3)CC (Constant Current) Control SchemeFrom Eq.3, it can be easily seen that there are two ways to implement CC control: one is PFM (Pulse Frequency Modulation), the control scheme is to keep Ipk to be constant, let the product of Ts and Tdem (fs*Tdem) to be a constant. In this way, Iowill be a value independent to the variation of Vo, Lm, and line input voltage. Another realization method is PWM duty control, the control scheme is to keep fs to be constant, let the product of Tdem and Ipk (Tdem*Ipk) to be a constant, in another words, by modulating system duty cycle to realize a constant Io independent to the variation of Vo, Lm and line voltages.SF6020P adopts PFM for CC control, the product● Smart Output Short ProtectionThe output short circuit protection of conventional PSR system is based on the coupling between auxiliary winding and secondary winding. When output is short, the auxiliary winding cannot provide enough energy to the IC any more. In this way, the system will enter into auto-recovery mode protection. However, the IC may be wrongly supplied if the leakage inductance of the primarywinding is large enough.In SF6020P, if output short circuit occurs, the IC will detect the situation and enter into auto-recovery mode protection.● Proprietary Zero-Output Startup ControlConventional PSR system may suffer startup failure when output voltage is near zero voltage, which means that there is a gap between OCP (CC point in PSR CV/CC system) and full loading. LargerCapacitor NeededSF6020P uses a proprietary control to eliminate external compensation capacitor, which can simplify system design and lower system cost.● Maximum 50V Output for LED LightingSF6020P can support maximum 50V output, which can be used in AC/DC LED lighting.◆ Proprietary Cable Drop CompensationSF6020P has a proprietary built-in cable voltage drop compensation block which can provide a constant output voltage at the end of the cable over the entire load range in CV mode.◆ Multi Mode PSR Control for HighReliability , High EfficiencyConventional pure PFM controlled PSR system may suffer transformer saturation issue when heavy loading. In SF6020P, a proprietary multi mode control is adopted to suppress this issue, as shown in Fig.2. Around the full load, the system operates in PWM+PFM mode, which improve the system reliability. Under normal to light loadconditions, the IC operates in PFM mode to achieve excellent regulation and high efficiency.◆ Soft StartSF6020P features an internal 2ms (typical) soft start that slowly increases the threshold of cycle-by-cycle current limiting comparator during startup sequence. Every startup process is followed by a soft start activation.AC line voltage. In SF6020P the IC has built-in blocks to compensate the variation, as shown in Fig3. The IC can adjust CC point based on sensed output voltage and PFM duty. In this way, CC accuracy can be improved.Fig.3◆ Auto Recovery Mode ProtectionAs shown in Fig.4, once a fault condition is detected, switching will stop. This will cause VDD to fall because no power is delivered form the auxiliary winding. When VDD falls to UVLO(off) (typical 6.5V), the protection is reset and theoperating current reduces to the startup current, which causes VDD to rise, as shown in Fig.4. However, if the fault still exists, the system will experience the above mentioned process. If the fault has gone, the system resumes normal operation. In this manner, the auto restart can alternatively enable and disable the switching until6.5V◆ VDD OVP(Over Voltage Protection)VDD OVP is implemented in SF6020P and it is a protection of auto-recovery mode.◆ Base DriveSF6020P can directly drive external power BJT.PACKAGE MECHANICAL DATAIMPORTANT NOTICESiFirst Technology Nanhai, Ltd (SiFirst) reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.SiFirst warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with SiFirst’s standard warranty. Testing and other quality control techniques are used to the extent SiFirst deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed.SiFirst assumes no liability for application assistance or customer product design. Customers are responsible for their products and applications using SiFirst’s components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. Reproduction of SiFirst’s information in SiFirst’s data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. SiFirst is not responsible or liable for such altered documentation. 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