What is thermal dissipation power?
The thermal design power (TDP), sometimes called thermal design point, is the maximum amount of heat generated by a computer chip or component (often a CPU, GPU or system on a chip) that the cooling system in a computer is designed to dissipate under any workload.
How do you calculate thermal resistance junction ambient?
θJA = θJC + θCA= (TJ – TA) / PD Where TJ is the junction temperature of the semiconductor device mounted inside the oscillator (measured in °C), TA is the ambient temperature outside the oscillator (measured in °C), and PD is the power dissipation of the oscillator (measured in Watts).
Is a higher TDP better?
The higher the TDP, the better the cooling system you need. Furthermore, even if you can only use it as a rough estimation, a higher TDP translates into higher power consumption.
How is junction temperature related to thermal resistance?
The equation that relates junction temperature T j to thermal resistance θ Ja is: T j =T a + θ Ja × Power dissipation where T a is the ambient temperature. The maximum junction temperature (T j ) allowed for MIC94060 listed in the datasheet is 125° C.
What is the maximum dissipation of thermal resistance?
For a thermal resistance of 250°C/W that means 40°C / 250°C * 1 Watt = 0.16 Watt can be dissipated. Dissipate more and the junction in your device will become hotter than 90°C (assuming the ambient temperature is 50°C).
How is power dissipation related to junction temperature?
Thus, a higher θ Ja value leads to higher junction temperature for a given amount of power dissipation. The power dissipation for Micrel’s MIC94060 switch is calculated as: R ds (on) × I out ×I out where R ds (on) is the on-resistance of the switch and I out is the load current or output current.
Is there an upper limit for junction temperature?
For reliability reasons, integrated circuits handling appreciable power are increasingly called upon to observe thermal management. All semiconductors have some specified safe upper limit for junction temperature (TJ), usually on the order of 150°C (sometimes 175°C).