光耦原理介绍

1、光电耦合器tlp521是可控制的光电藕合器件，光电耦合器广泛作用在电脑终端机，可控硅系统设备，测量仪器，影印机，自动售票，家用电器，如风扇，加热器等电路之间的信号传输，使之前端与负载完全隔离，目的在于增加安全性，减小电路干扰，减化电路设计。东芝tlp521 1 , 2和4组成的神化钱红外发光二极管耦合到光三极管。该tlp521-2提供了两个孤立的 光耦8引脚塑料圭拽t而 tlp521-4提供了 4个孤立的光 耦中16引脚塑料dip封装集电极-发射极电压：55 v （最小值）经常转移的比例：50 % （最小）隔离电压:2500 vrms （最小）图1 tlp521 tlp521-2 tlp521

2、-4 光藕内部结构图及引脚图图2 tlp521-2光电耦合器引脚排列图absolute maximum ratings绝对最大额定值（ta = 25 ）characteristic 参数symbol符号rating 数值unit单位tlp521-1tlp521- 2 tlp521 - 4ledforward current 正 向电流if7050maforward current derating正向 电流减率a if/ c-0.93(ta 50)-0.5(ta 25)ma/cpulse forward current瞬间正向脉冲电流ifp1 (100 pulse, 100pps)arever

3、se voltage 反向电压vr5vjunction temperature结温tj125c接收collector - emitter voltage集电极发射极电压vceo55v侧1emitter - collector voltage发射极集电veco7v极电压collector current集电极电流ic50macollector power dissipation (1 circuit)集电极功耗pc150100mwcollector power dissipation derating (1 circuit ta 25 c)集电极功耗减率a pc/ c-1.5-1.0mwcjun

4、ction temperature结温tj125cstorage temperature range储存温度范围tstg-55125coperating temperature range工作温度范围opr-55100clead soldering temperature无铅焊接温度tsol260 (10 s)ctotal package power dissipation整体功耗pt250150mwtotal package power dissipation derating(ta25c)整体功耗减率a pt/ c-2.5-1.5mwcisolation voltage隔高电压bvs250

5、0(ac,1min 最小，r.h. 60%)vrms注：使用连续负载很重的情况下（如高温/电流/温度/电压和重大变化等），可能会导致本产品的可靠性下降明显甚至损坏。recommended operating conditions建议操作条件characteristic 参数symbol #min最小typ典型max取大unit单位supply voltage电源电压vcc一524vforward current 正 向电流if一1625macollector current集电极电流ic一110maoperating temperature操作温度topr-25一85c型号classi - f

6、ication (*1)分级标 准current transfer ratio (%)(ic/if) 经常转移率()(ic/if)marking of classification标志的分类if = 5ma, vce = 5v, ta = 25 c最小取大tlp521a50600blank, y, y, g, g, b, b, gbrank y50150y, yrank gr100300g, grank bl200600b, brank gb100600g, g, b, b, gbtlp521- 2tlp521-4a50600blank, gr, bl, gbrank gb100600gr,

7、bl, gb*1: ex. rank gb: tlp521 -1 (gb)(note): application type name for certification test, please use standard product type name, i.e.tlp521- 1 (gb): tlp521 - 1, tlp521 - 2 (gb): tlp521 - 2individual electrical characteristic单独的电气特性参数(ta = 25 )characteristic 参数symbol符号test condition 测试条件min最小typ典型ma

8、x 最 大unit单位ledforward voltage 正向电压vfif = 10ma1.01.15 1.3 vreverse current反向电流irvr = 5v一10心acapacitance 电容ctv=0, f =1mhz一30pf攵collector - emitter breakdown voltage集电极发射极击穿电压v(br)ceoic = 0.5ma55一vemitter - collector breakdown voltage发射极集电极击穿电压v(br)ecoie = 0.1ma7vcollector dark current集电极暗电流iceovce = 2

9、4v一10100navce=24v,ta=8 5一250a acapacitance (collector to emitter) 电容(集 电极到发射极)ccev =0, f =1mhz一10pfcoupled electrical characteristic耦合电气特性参数 s (ta = 25 )characteristic 参数symbol符号test condition 测试条件min 最 小typ典型max取大unit单位current transfer ratio经常转移的比率c/ific/if (sat)if=5ma, vce =5v rank gb50一一60600%100

10、600saturated ctr 饱和率if=1ma, vce=0.4v rank gb一一%30一collector - emitter saturation voltage集电极-发射极饱和电压vce (sat)ic = 2.4 ma, if = 8 ma一一0.4vic=0.2ma, if=1ma rank gb一 一0.2一0.4isolation characteristic 耦合电气特性参数 (ta = 25 )characteristic 参数symbo l符号test condition 测试条件min最小typ典型max最 大unit单位capacitance(input t

11、o output)电容(输入输出)csvs = 0, f = 1 mhz一0.8一pfsolation resistance 隔离电阻rsvs = 500 v, r.h. wbauoll.4ps3im1wamki ionf- ta mruzr-aih aro ta,1puse forwardi vchace veto (vis- 一 一 - 一fyecohectoccjrrenl 匕(man 8_cvcef&oc2eaaen -手 zq-gc vcm 3axcolcctor cwrent iq (ma)ocfcg_a_n5ef vutwa vcfn)ccfledof-antler sat* a

12、on hge vce(t)mhicm *)-q-f一 f-8二 7ic-ta一l:|甲自ciiirm is m190 mrl - switching timetoxico应用电路:d-orr图7打开或关闭12v直流电动机的ttl控制信号输入电路图74hc04 特性:?缓冲输入? 传输延迟（典型值）:6ns at v cc = 5v, c l = 15pf, t a= 25?扇出（驱动）能力:-标准输出.-总线驱动.（在温度范围内）10 lsttl loads15 lsttl loads? 宽工作温度范围.-55 c to 125?对称的传输延迟和转换时间 ?相对于lsttl逻辑ic,功耗减少很

13、多? hc types-工作电压：2v到6v-高抗扰度：n il = 30%, n ih= 30% of v cc at v cc= 5v? hct types- 工作电压：4.5v到5.5v- 兼容直接输入 lsttl逻辑信号,v il= 0.8v (max), v ih = 2v (min)- 兼容 cmo投辑入,i l $1 wa at v ol, vo该74hc04/74hct04 是高速 cmos器件，低功耗肖特基的ttl(lsttl)电路功能作用：六反相器a oo图2逻辑图inputoutputnanlhhl图3 7404 真值表取人额7e值电源电压-0.5 to +7.0vdc输

14、入电压-1.5 to vcc+1.5v直流输出电压-0.5 to vcc+0.5v钳位二极管电流20ma直流输出电流，每个引脚(输出)25ma功耗600mw建议操作条件operating conditions操作条件最小取大 jsupply voltage电源电压(vcc)26dc输入或输出电压(输入电压，输出电压)0vccoperating temp. range (ta)工作温度mm74hc-40+85mm54hc-55+ 125nput rise or fall times输入上升或卜降vcc=2.0v1000时间(tr,tf)vcc=4.5v500nsvcc=6.0v400ns直流电气

15、特性symbol符号parameter 参数conditions 条件vccta=25 c74hcta=-40 to85 c54hc tato 125位典型guaranteed limits保证极vih输入局电平电压2.0v1.51.51.54.5v3.153.153.156.0v4.24.24.2vil输入低电平电压2.0v0.50.50.54.5v1.351.351.356.0v1.81.81.8voh输出高电平电压iout2.0v2.01.91.91.9vin = vil |20 “a4.5v4.54.44.44.46.0v6.05.95.95.9vin=vil |iout4.5v4.2

16、3.983.843.7i(4.0 ma iout i 5.2 ma6.0v5.75.485.345.2vol输出低电平电压1 iout2.0v00.10.10.1vrin=vih 9n , 4.5v00.10.10.16.0v00.10.10.1vin=vih1 iout4.5v0.20.260.330.4i(4.0 ma iout i 5.2 ma6.0v0.20.260.330.4iin最大输入电流vin=vcc or gnd6.0v0.11.01.0icc电源电流vin=vcc or gndiout=0 科 a6.0v2.02040交流电气特性symbol #parameter 参数条件典型guaranteed limit保证极限tphl,tplh最高传播延迟时间815ac electrical characteristics vcce2.0v to 6.0v, cle50 pf, tretfe6 ns (unless otherwise specified) 交流电气特性：symbol符号parameter 参数conditions条件vccta=25 cta eb40 to85 cta eb55 to 12典型保证界限tphl,tplh最大传输延迟时间2.0v559512014