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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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KMPC880ZP133 데이터시트(PDF) 13 Page - Freescale Semiconductor, Inc |
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KMPC880ZP133 데이터시트(HTML) 13 Page - Freescale Semiconductor, Inc |
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13 / 92 page  MPC885/MPC880 Hardware Specifications, Rev. 3 Freescale Semiconductor 13 Thermal Calculation and Measurement 7.3 Estimation with Junction-to-Board Thermal Resistance A simple package thermal model that 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 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 and especially PBGA packages is strongly dependent on the board temperature; see Figure 3. Figure 3. Effect of Board Temperature Rise on Thermal Behavior If the board temperature is known, an estimate of the junction temperature in the environment can be made using the following equation: TJ = TB + (RθJB × PD) where: RθJB = junction-to-board thermal resistance (ºC/W) TB = board temperature ºC PD = power dissipation in package If the board temperature is known and the heat loss from the package case to the air can be ignored, acceptable predictions of junction temperature can be made. For this method to work, the board and board mounting must be similar to the test board used to determine the junction-to-board thermal resistance, namely a 2s2p (board with a power and a ground plane) and vias attaching the thermal balls to the ground plane. 7.4 Estimation Using Simulation When the board temperature is not known, a thermal simulation of the application is needed. The simple two resistor model can be used with the thermal simulation of the application [2], or a more accurate and complex model of the package can be used in the thermal simulation. |
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유사한 설명 - KMPC880ZP133 |
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