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IGBT Forum Discussions

User17687
Level 1
5 questions asked First question asked First reply posted
Level 1
Good morning!

What is the meaning of the so called lead resistances RCC'EE' and RAA'EE' specified in the module data sheet?

Thanks!
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IGBT_Wizzard
Moderator
Moderator 10 solutions authored 10 replies posted 5 solutions authored
Moderator
Hi Walter,
these are the resistances of the path between the main terminals and IGBT (RCC'EE') or main terminals and Diode chips (RAA'EE'). When you want to measure Vcesat or Vf you should contact the probes between the C' and E' auxiliary terminals, not directly between the C and E main terminals. This avoids to include the resitive voltage drop of Ic*RCC'EE' or If*RAA'CC' into your measurement.
C: main Collector terminal
C´: auxiliary Collector terminal
E: main Emitter terminal
E´: auxiliary Emitter terminal
TS

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IGBT_Wizzard
Moderator
Moderator 10 solutions authored 10 replies posted 5 solutions authored
Moderator
Hi Walter,
these are the resistances of the path between the main terminals and IGBT (RCC'EE') or main terminals and Diode chips (RAA'EE'). When you want to measure Vcesat or Vf you should contact the probes between the C' and E' auxiliary terminals, not directly between the C and E main terminals. This avoids to include the resitive voltage drop of Ic*RCC'EE' or If*RAA'CC' into your measurement.
C: main Collector terminal
C´: auxiliary Collector terminal
E: main Emitter terminal
E´: auxiliary Emitter terminal
TS
0 Likes