參數(shù)資料
型號(hào)： MPC755BRX450LE
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 450 MHz, RISC PROCESSOR, CBGA360
封裝： 25 X 25 MM, 3.20 MM HEIGHT, 1.27 MM PITCH, CERAMIC, BGA-360
文件頁(yè)數(shù)： 39/52頁(yè)
文件大?。?/td> 1278K
代理商： MPC755BRX450LE
44
MPC755 RISC Microprocessor Hardware Specifications
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
System Design Information
1.8.8.3
Heat Sink Selection Example
This section provides a heat sink selection example using one of the commercially-available heat sinks. For
preliminary heat sink sizing, the die-junction temperature can be expressed as follows:
Tj = Ta + Tr + (θjc + θint + θsa) × Pd
where:
Tj is the die-junction temperature
Ta is the inlet cabinet ambient temperature
Tr is the air temperature rise within the computer cabinet
θ
jc is the junction-to-case thermal resistance
θ
int is the adhesive or interface material thermal resistance
θ
sa is the heat sink base-to-ambient thermal resistance
Pd is the power dissipated by the device
During operation the die-junction temperatures (Tj) should be maintained less than the value specified in
Table 3. The temperature of the air cooling the component greatly depends on the ambient inlet air
temperature and the air temperature rise within the electronic cabinet. An electronic cabinet inlet-air
temperature (Ta) may range from 30° to 40°C. The air temperature rise within a cabinet (Tr) may be in the
range of 5° to 10°C. The thermal resistance of the thermal interface material (
θ
int) is typically about 1°C/W.
Assuming a Ta of 30°C, a Tr of 5°C, a CBGA package Rθjc < 0.1, and a power consumption (Pd) of 5.0 W,
the following expression for Tj is obtained:
Die-junction temperature:
Tj = 30°C + 5°C + (0.1°C/W + 1.0°C/W + θsa) × 5.0 W
For a Thermalloy heat sink #2328B, the heat sink-to-ambient thermal resistance (
θ
sa) versus airflow
velocity is shown in Figure 28.
Assuming an air velocity of 0.5 m/s, we have an effective Rsa of 7°C/W, thus
Tj = 30°C + 5°C + (0.1°C/W + 1.0°C/W + 7°C/W) × 5.0 W,
resulting in a die-junction temperature of approximately 76°C which is well within the maximum operating
temperature of the component.
Other heat sinks offered by Aavid Thermalloy, Alpha Novatech, The Bergquist Company, IERC, Chip
Coolers, and Wakefield Engineering offer different heat sink-to-ambient thermal resistances, and may or
may not need airflow.
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