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KMPC860DTZQ80D4 데이터시트(PDF) 12 Page - Freescale Semiconductor, Inc |
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KMPC860DTZQ80D4 데이터시트(HTML) 12 Page - Freescale Semiconductor, Inc |
12 / 80 page MPC860 PowerQUICC™ Family Hardware Specifications, Rev. 8 12 Freescale Semiconductor Thermal Calculation and Measurement 7 Thermal Calculation and Measurement For the following discussions, PD = (VDD × IDD) + PI/O, where PI/O is the power dissipation of the I/O drivers. 7.1 Estimation with Junction-to-Ambient Thermal Resistance An estimation of the chip junction temperature, T J, in ºC can be obtained from the equation: TJ = TA + (RθJA × PD) where: TA = ambient temperature (ºC) RθJA = package junction-to-ambient thermal resistance (ºC/W) PD = power dissipation in package The junction-to-ambient thermal resistance is an industry standard value which provides a quick and easy estimation of thermal performance. However, the answer is only an estimate; test cases have demonstrated that errors of a factor of two (in the quantity TJ – TA) are possible. 7.2 Estimation with Junction-to-Case Thermal Resistance Historically, the thermal resistance has frequently been expressed as the sum of a junction-to-case thermal resistance and a case-to-ambient thermal resistance: RθJA = RθJC + RθCA where: RθJA = junction-to-ambient thermal resistance (ºC/W) RθJC = junction-to-case thermal resistance (ºC/W) RθCA = case-to-ambient thermal resistance (ºC/W) RθJC is device related and cannot be influenced by the user. The user adjusts the thermal environment to affect the case-to-ambient thermal resistance, RθCA. For instance, the user can change the airflow around the device, add a heat sink, change the mounting arrangement on the printed-circuit board, or change the thermal dissipation on the printed-circuit board surrounding the device. This thermal model is most useful for ceramic packages with heat sinks where some 90% of the heat flows through the case and the heat sink to the ambient environment. For most packages, a better model is required. 7.3 Estimation with Junction-to-Board Thermal Resistance A simple package thermal model which has demonstrated reasonable accuracy (about 20%) is a two-resistor model consisting of a junction-to-board and a junction-to-case thermal resistance. The junction-to-case thermal resistance covers the situation where a heat sink is used or where a substantial amount of heat is dissipated from the top of the package. The junction-to-board thermal resistance describes the thermal performance when most of the heat is conducted to the printed-circuit board. It has been observed that the thermal performance of most plastic packages, especially PBGA packages, is strongly dependent on the board temperature; see Figure 2. |
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