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HCPL-314J-000E Datasheet(PDF) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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HCPL-314J-000E Datasheet(HTML) 11 Page - AVAGO TECHNOLOGIES LIMITED |
11 / 15 page 11 Applications Information Eliminating Negative IGBT Gate Drive TokeeptheIGBTfirmlyoff,theHCPL-314Jhasaverylow maximumVOLspecificationof1.0V.MinimizingRgand theleadinductancefromtheHCPL-314JtotheIGBTgate andemitter(possiblybymountingtheHCPL-314Jona small PC board directly above the IGBT) can eliminate theneedfornegativeIGBTgatedriveinmanyapplica- tionsasshowninFigure19.Careshouldbetakenwith suchaPCboarddesigntoavoidroutingtheIGBTcollec- tororemittertracesclosetotheHCPL-314Jinputasthis canresultinunwantedcouplingoftransientsignalsinto theinputofHCPL-314Janddegradeperformance.(Ifthe IGBT drain must be routed near the HCPL-314J input, thentheLEDshouldbereversebiasedwhenintheoff state,topreventthetransientsignalscoupledfromthe IGBTdrainfromturningontheHCPL-314J.)Anexternal clampdiodemaybeconnectedbetweenpins14&15 andpins9&10(asshowninFigure19)fortheprotec- tionofHCPL-314JinthecaseofIGBTsswitchinginduc- tiveload. Figure 19. Recommended LED Drive and Application Circuit for HCPL-314J. + HVDC 3-PHASE AC 0.1 µF FLOATING SUPPLY VCC = 18 V 1 3 + – 2 16 14 15 270 Ω HCPL-314J +5 V CONTROL INPUT Rg 74XX OPEN COLLECTOR GND 1 7 6 8 10 11 9 - HVDC 0.1 µF VCC = 18 V + – Rg 270 Ω +5 V CONTROL INPUT 74XX OPEN COLLECTOR GND 1 VOL |
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