參數(shù)資料
型號(hào)： XPC860DPZP50D3
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： PT 18C 18#20 SKT RECP
中文描述： 32-BIT, 50 MHz, RISC PROCESSOR, PBGA357
封裝： PLASTIC, BGA-357
文件頁(yè)數(shù)： 11/76頁(yè)
文件大小： 857K
代理商： XPC860DPZP50D3
MOTOROLA
MPC860 Family Hardware Specifications
11
Estimation with Junction-to-Board Thermal Resistance
where:
R
θ
JA
= junction-to-ambient thermal resistance (oC/W)
R
θ
JC
= junction-to-case thermal resistance (oC/W)
R
θ
CA
= case-to-ambient thermal resistance (oC/W)
R
θ
JC
is device related and cannot be influenced by the user. The user adjusts the thermal
environment to affect the case-to-ambient thermal resistance, R
θ
CA
. For instance, the user
can change the air flow 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 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 7-1.
Figure 7-1. Effect of Board Temperature Rise on Thermal Behavior
0
10
20
30
40
50
60
70
80
90
100
0
20
40
60
80
Board Temperture Rise Above Ambient Divided by Package
J
A
J
A
相關(guān)PDF資料
PDF描述
XPC860PZP50D3 Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT07; Number of Contacts:19; Connector Shell Size:14; Connecting Termination:Solder; Circular Shell Style:Jam Nut Receptacle
XPC860DPCZP50D3 Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT07; No. of Contacts:19; Connector Shell Size:14; Connecting Termination:Solder; Circular Shell Style:Jam Nut Receptacle
XPC860DEZP50D4 Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT07; Number of Contacts:5; Connector Shell Size:14; Connecting Termination:Solder; Circular Shell Style:Jam Nut Receptacle
XPC860DTZP50D4 Circular Connector; No. of Contacts:5; Series:; Body Material:Aluminum; Connecting Termination:Solder; Connector Shell Size:14; Circular Contact Gender:Socket; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:14-5
XPC860ENZP50D4 Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT07; Number of Contacts:23; Connector Shell Size:16; Connecting Termination:Solder; Circular Shell Style:Jam Nut Receptacle
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