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參數資料
| 型號： | DSP56853FGE |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | 16-bit Digital Signal Controllers |
| 中文描述： | 16位數字信號控制器 |
| 文件頁數： | 54/60頁 |
| 文件大小： | 836K |
| 代理商： | DSP56853FGE |
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56853 Technical Data, Rev. 6
54
Freescale Semiconductor
Part 6 Design Considerations
6.1 Thermal Design Considerations
An estimation of the chip junction temperature, T
J
, in
°
C can be obtained from the equation:
Equation 1:
T
J
= T
A
+ (P
D
x R
θ
JA
)
Where:
T
A
= ambient temperature °C
R
θ
JA
= package junction-to-ambient thermal resistance °C/W
P
D
= 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:
Equation 2:
R
θ
JA
= R
θ
JC
+ R
θ
CA
Where:
R
θ
JA
= package junction-to-ambient thermal resistance °C/W
R
θ
JC
= package junction-to-case thermal resistance °C/W
R
θ
CA
= package case-to-ambient thermal resistance °C/W
R
θ
JC
is device-related and cannot be influenced by the user. The user controls the thermal environment to change
the case-to-ambient thermal resistance, R
θ
CA
. 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 the PCB. This model is most useful for ceramic packages
with heat sinks; some 90% 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 estimations obtained from R
θ
JA
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 definitions for determining the junction-to-case thermal
resistance in plastic packages:
Measure the thermal resistance from the junction to the outside surface of the package (case) closest to the
chip mounting area when that surface has a proper heat sink. This is done to minimize temperature variation
across the surface.
Measure the thermal resistance from the junction to where the leads are attached to the case. This definition
is approximately equal to a junction to board thermal resistance.
Use the value obtained by the equation (T
J
– T
T
)/P
D
where T
T
is the temperature of the package case
determined by a thermocouple.
As noted above, the junction-to-case thermal resistances quoted in this data sheet are determined using the first
definition. From a practical standpoint, that value is also suitable for determining the junction temperature from a
case thermocouple reading in forced convection environments. In natural convection, using the junction-to-case
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| DSP56854FG120 | 16-bit Digital Signal Controllers |
| DSP56855BU120 | 16-bit Digital Signal Controllers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DSP56853PB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:56853 Digital Signal Processor Product Brief |
| DSP56854 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| DSP56854E | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| DSP56854FG120 | 功能描述:數字信號處理器和控制器 - DSP, DSC 120Mhz/120MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數據總線寬度:16 bit 程序存儲器大小:16 KB 數據 RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數量:35 定時器數量:3 設備每秒兆指令數:50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
| DSP56854FGE | 功能描述:數字信號處理器和控制器 - DSP, DSC 120Mhz/120MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數據總線寬度:16 bit 程序存儲器大小:16 KB 數據 RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數量:35 定時器數量:3 設備每秒兆指令數:50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT |
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