Figure 20.
Junction temperature calculation
5.2
Temperature measurements
We measured the SCR and bridge diode case temperatures applying the following conditions:
•
T
amb
= 60°C
•
Load power = 1000 W
•
V
AC
= 230 V
RMS
/50 Hz
Ip = 2 ⋅ 1000
230 = 6.15A→Pd = 1.84W
At P = 1000 W, the maximum case temperatures measured are 125°C and 130°C on the SCR and the bridge
diode.
Table 4.
Maximum case temperatures for SCR and bridge diode
Case temperature
SCR
Bridge diode
Tc (°C)
125
130
Tj (°C)
127
145
Guard band
Good
Low
UM2948
Temperature measurements
UM2948
-
Rev 1
page 14/28
