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3. Case Temperature & Junction Temperature
3. Case Temperature & Junction Temperature
• Junction Temperature(Tj)
Definition of Junction Temperature(Tj) is internal temperature of a chip
at which temperature has the highest value.
Since it is hard to measure Junction Temperature(Tj) at firsthand, the value of the Tj
Since it is hard to measure Junction Temperature(Tj) at firsthand the value of the Tj
can be assumed by the equation shown in Figure.11 on the next page.
• Case Temperature (Tc):
Case Temperature(Tc) is the temperature at the center point of the module plate remarked
in Figure 10. It shows how to measure Tc.
*Case Temperature(Tc) should be lower than 70ºC while the LED module is operating.
Thermocouple
Figure.6 Module Plate (bottom view)
Thermal paste
Thermal paste
Case temperature (Tc)
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