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参数资料
| 型号： | HCPL-4504-300 |
| 元件分类： | 光电耦合器 |
| 英文描述： | 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER |
| 封装： | 0.300 INCH, SURFACE MOUNT, DIP-8 |
| 文件页数： | 10/19页 |
| 文件大小： | 457K |
| 代理商： | HCPL-4504-300 |
18
Power Inverter Dead Time and Propagation Delay Specifica-
tions
The HCPL-4504/0454/J454 and HCNW4504 include a
specificationintendedtohelpdesignersminimize“dead
time”intheirpowerinverterdesigns.Thenew“propaga-
tiondelaydifference”specification(tPLH-tPHL)isusefulfor
determining not only how much optocoupler switch-
ingdelayisneededtoprevent“shoot-through”current,
butalsofordeterminingthebestachievableworst-case
deadtimeforagivendesign.
When inverter power transistors switch (Q1 and Q2 in
Figure17),itisessentialthattheyneverconductatthe
sametime.Extremelylargecurrentswillflowifthereis
anyoverlapintheirconductionduringswitchingtran-
sitions, potentially damaging the transistors and even
thesurroundingcircuitry.This“shoot-through”currentis
eliminatedbydelayingtheturn-onofonetransistor(Q2)
longenoughtoensurethattheopposingtransistor(Q1)
hascompletelyturnedoff.Thisdelayintroducesasmall
amountof“deadtime”attheoutputoftheinverterdur-
ingwhichbothtransistorsareoffduringswitchingtran-
sitions.Minimizingthisdeadtimeisanimportantdesign
goalforaninverterdesigner.
The amount of turn-on delay needed depends on the
propagationdelaycharacteristicsoftheoptocoupler,as
wellasthecharacteristicsofthetransistorbase/gatedrive
circuit.Consideringonlythedelaycharacteristicsofthe
optocoupler (the characteristics of the base/gate drive
circuitcanbeanalyzedinthesameway),itisimportant
toknowtheminimumandmaximumturn-on(tPHL)and
turnoff (tPLH) propagation delay specifications, prefer-
ablyoverthedesiredoperatingtemperaturerange.The
importanceofthesespecificationsisillustratedinFigure
17. The waveforms labeled“LED1”,“LED2”,“OUT1”, and
“OUT2”aretheinputandoutputvoltagesoftheopto-
couplercircuitsdrivingQ1andQ2respectively.Mostin-
vertersaredesignedsuchthatthepowertransistorturns
onwhentheoptocouplerLEDturnson;thisensuresthat
bothpowertransistorswillbeoffintheeventofapower
lossinthecontrolcircuit.Inverterscanalsobedesigned
suchthatthepowertransistorturnsoffwhentheopto-
couplerLEDturnson;thistypeofdesign,however,re-
quiresadditionalfail-safecircuitrytoturnoffthepower
transistor if an over-current condition is detected.The
timing illustrated in Figure 17 assumes that the power
transistorturnsonwhentheoptocouplerLEDturnson.
Figure 17. LED delay and dead time diagram.
相关PDF资料 |
PDF描述 |
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| HCPL-5501 | NPN-OUTPUT DC-INPUT OPTOCOUPLER |
| HCPL-5531 | Receptacle With No Tail |
| HCPL-573K | NPN-OUTPUT DC-INPUT OPTOCOUPLER |
| HCPL-6730 | Hermetically Sealed. Low IF. Wide Vcc. High Gain Optocouplers |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HCPL-4504-300E | 功能描述:高速光耦合器 1MBd 1Ch 12mA RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
| HCPL-4504-320E | 功能描述:高速光耦合器 1MBd 1Ch 12mA RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
| HCPL-4504-360E | 功能描述:高速光耦合器 1MBd 1Ch 12mA RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
| HCPL-4504-500E | 功能描述:高速光耦合器 1MBd 1Ch 12mA RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
| HCPL-4504-520E | 功能描述:高速光耦合器 1MBd 1Ch 12mA RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
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