参数资料
型号: DSP56311VF150R2
厂商: Freescale Semiconductor
文件页数: 69/96页
文件大小: 0K
描述: IC DSP 24BIT 150MHZ 196-BGA
标准包装: 750
系列: DSP56K/Symphony
类型: 定点
接口: 主机接口,SSI,SCI
时钟速率: 150MHz
非易失内存: ROM(576 B)
芯片上RAM: 384kB
电压 - 输入/输出: 3.30V
电压 - 核心: 1.80V
工作温度: -40°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 196-LBGA
供应商设备封装: 196-MAPBGA(15x15)
包装: 带卷 (TR)
DSP56311 Technical Data, Rev. 8
Freescale Semiconductor
4-1
Design Considerations
4
This section describes various areas to consider when incorporating the DSP56311 device into a system design.
4.1 Thermal Design Considerations
An estimate of the chip junction temperature, TJ, in ° C can be obtained from this equation:
Equation 1:
Where:
TA
=
ambient temperature °C
RθJA
=
package junction-to-ambient thermal resistance °C/W
PD
=
power dissipation in package
Historically, thermal resistance has been expressed as the sum of a junction-to-case thermal resistance and a case-
to-ambient thermal resistance, as in this equation:
Equation 2:
Where:
RθJA
=
package junction-to-ambient thermal resistance °C/W
RθJC
=
package junction-to-case thermal resistance °C/W
RθCA
=
package case-to-ambient thermal resistance °C/W
RθJC is device-related and cannot be influenced by the user. The user controls the thermal environment to change
the case-to-ambient thermal resistance, RθCA. For example, the user can change the air flow around the device, add
a heat sink, change the mounting arrangement on the printed circuit board (PCB) or otherwise change the thermal
dissipation capability of the area surrounding the device on a PCB. This model is most useful for ceramic packages
with heat sinks; some 90 percent of the heat flow is dissipated through the case to the heat sink and out to the
ambient environment. For ceramic packages, in situations where the heat flow is split between a path to the case
and an alternate path through the PCB, analysis of the device thermal performance may need the additional
modeling capability of a system-level thermal simulation tool.
The thermal performance of plastic packages is more dependent on the temperature of the PCB to which the
package is mounted. Again, if the estimates obtained from RθJA do not satisfactorily answer whether the thermal
performance is adequate, a system-level model may be appropriate.
A complicating factor is the existence of three common ways to determine the junction-to-case thermal resistance
in plastic packages.
T
J
T
A
P
D
RθJA
×
()
+
=
RθJA
RθJC RθCA
+
=
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