參數(shù)資料
型號(hào): HCPL-4504-300
元件分類: 光電耦合器
英文描述: 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER
封裝: 0.300 INCH, SURFACE MOUNT, DIP-8
文件頁數(shù): 10/19頁
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.
相關(guān)PDF資料
PDF描述
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
HCPL-6731 NPN-OUTPUT DC-INPUT OPTOCOUPLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)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 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube
HCPL-4504-320E 功能描述:高速光耦合器 1MBd 1Ch 12mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube
HCPL-4504-360E 功能描述:高速光耦合器 1MBd 1Ch 12mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube
HCPL-4504-500E 功能描述:高速光耦合器 1MBd 1Ch 12mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube
HCPL-4504-520E 功能描述:高速光耦合器 1MBd 1Ch 12mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube