Application Note IGBT Definition of Junction Temperature

Application Note, V1.0, 2008
AN2008-01
Technical Information
IGBT Modules
Definition and use of junction temperature values
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Autor: Hubert Ludwig IFAG AIM PMD ID TM
Edition 2008-01-10
Published by
Infineon Technologies AG
59568 Warstein, Germany
© Infineon Technologies AG 2008.
All Rights Reserved.
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AN2008-1
Definition of junction temperature
Definition and use of the junction temperature values (Tvj; Tvjmax, Tvjop)
The International Standard IEC 60747-9 gives product specific standards for
terminology, letter symbols, essential ratings and characteristics, verification
of ratings and methods of measurement for insulated-gate bipolar
transistors (IGBTs).
Essential ratings and characteristics in the IEC Standards
In chapter 5.1 the ratings and limiting values are defined for:
ambient or case or virtual junction temperature (Ta or Tc or Tvj),
Storage temperature (Tstg),
Collector-emitter voltage with gate-emitter short-circuited (VCES),
Gate-emitter voltages (VGES),
Continuous collector current (IC),
Repetitive peak collector current (ICRM),
Non-repetitive peak collector current (ICSM),
Total power dissipation (Ptot),
Maximum safe operating area,
Maximum reverse biased safe operating area (RBSOA) and
Maxmum short circuit safe operating area (SCSOA).
Definition of Tvj
The Junction temperature Tvj is the temperature in the junction region of a
semiconductor chip. This junction temperature is to determine the thermal
resistance junction to case RthJC used for further calculations. Because it
does not precisely match the exact junction temperature of one of the chips
in a module it is more correctly termed “Virtual junction temperature”.
Definition of Tvj max
The rated maximum operating junction temperature Tvjmax is used to
determine the maximum allowable power dissipation of a continuously
turned on IGBT (i.e. static operation).
For switching operation (also for the short period of time during turn-off of
the IGBT) it has to be ensured that the device safely operates under high
dynamic stress, short dynamic temperature transients and operational chipand module temperature inhomogenities.
Hence, the maximum calculated virtual junction temperature under dynamic
operation is limited to a value lower than Tvjmax.
The RBSOA diagram (Reverse Biased Safe Operating Area) in the
respective data sheets is showing the area of collector current IC and
collector-emitter voltage VCE which the IGBTs will sustain simultaneously for
a short period of time during turn-off without being damaged under the
specified conditions.
Application Note
3
V1.0, 2008-01-08
AN2008-1
Definition of junction temperature
Definition of Tvj op (most practical value)
The operating temperature Tvjop specifies the limits (minimum and maximum
value) of the junction temperature between which the device may be
operated. This includes the switching operation and shows identical
maximum values as specified in the RBSOA diagram.
For applications with switching operation the relevant design limit is
therefore the specified operation temperature Tvjop. Calculations of current
carrying capability at normal load and overload (also for short time duration)
should be done using the average on state, turn-on (Eon) and turn-off (Eoff)
losses in regard to stay within the allowed operation temperature range.
(Note: One can ignore the peak power losses and the generated transient
temperature rise during “turn on” or “turn off”. They are not specified in detail
and already considered in the specified temperature Tvjop )
The specified maximum operation temperature Tvjop of Infineon (eupec)
IGBT modules is:
Tvjop max =125°C
• 600V IGBT2
DLC, KL4 series
• 1200V IGBT2
DN2, DLC, KF4, KL4C and KS4 series
• 1200V IGBT3
KE3 and KT3 series
• 1600/1700V IGBT1 DN2 and KF4 series
• 1700V IGBT2
DLC and KF6 series
• 1700V IGBT3
KE3 series
• 3300V IGBT2
KF2C series
• 6500V IGBT2
KF2 series
Tvjop max =150°C
• 600V IGBT3
• 1200V IGBT4
• 1700V IGBT4
• 3300V IGBT3
E3 series
P4, E4, T4 series
P4, E4 series
L3, E3 series
Important note:
Exceeding the specified limiting values means operation out of the
specification. This can lead to a failure and will reduce the life time of
the device!
Application Note
4
V1.0, 2008-01-08
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