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AN4043 bảng dữ liệu(PDF) 47 Page - STMicroelectronics

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AN4043 bảng dữ liệu(HTML) 47 Page - STMicroelectronics

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AN4043
Power losses and dissipation
Doc ID 022726 Rev 2
47/60
Figure 29 shows an equivalent circuit of the thermal resistance between junction and
ambient Rth(j-a).
Figure 29.
Rth(j-a) equivalent thermal circuit
As the power loss Ptot is cyclic, also the transient thermal impedance must be considered. It
is defined as the ratio between the time dependent temperature increase above the
reference,
ΔT(t), and the relevant heat flow:
Equation 31
Contrary to that already seen regarding the thermal resistance, the thermal impedance is
typically represented by an RC equivalent circuit. For pulsed power loss, the thermal
capacitance effect delays the rise in junction temperature and therefore the advantage of
this behavior is the short-term overload capability of the SLLIMM-nano.
For example,
Figure 30 shows thermal impedance from a junction to ambient curve for a
single IGBT of the SLLIMM-nano.
Figure 30.
Thermal impedance Zth(j-a) curve for a single IGBT
AM11817v1
P
)
t
(
T
)
t
(
Zth
Δ
Δ
=
AM11818v1
SLLIMM-nano Zth(j-a)
0
10
20
30
40
50
60
1.E-05
1.E-04
1.E-03
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
time (sec)



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