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参数资料
| 型号： | ML7820A-FBE |
| 元件分类： | 固定正电压单路输出标准稳压器 |
| 英文描述： | 20 V FIXED POSITIVE REGULATOR, PSFM3 |
| 封装： | ROHS COMPLIANT, TO-220, 3 PIN |
| 文件页数： | 2/11页 |
| 文件大小： | 459K |
| 代理商： | ML7820A-FBE |
( 3 )
Heat Radiation Balance
(3-1)
TO-220 with heat sink
Where
θjc :
θjs :
θCH :
θHS :
The relation between temperature and heat radiation quantity is shown below.
Tj=PLOSS X (θjc+θCH +θHS) + Ta
(℃ )
The heat produced in the IC is radiated to ambience through the package and the heat
sink.
The quantity of the heat radiation depends on the heat source temperature, ambient
temperature and the thermal resistance of the package.
Heat radiation balance model of the TO-220 with heat sink is shown as below.
thermal resistance between IC chip (junction point) and the
package backside connecting to the heatsink.
thermal resistance between IC chip (junction point) and the
package surface.
thermal resistance between package backside and the heat sink
including the condidtion of insulator, silicon grease and
tighten torque.
thermal resistance of the heat sink
If the js is large enough compare with other thermal resistance, the js can be neglected and the
heat radiation model can be mentioned as below.
Tj
Ta
LOSS
P
Ambient
Temperature
Heat Source
(junction)
Temperature
JC
θθCH
θHS
θJS
Heat Sink
IC
Package
Face Side
Resin
Chip
Package
Back Side
θJS
θJC
θCH
θHS
Tj
LOSS
P
θJC
θCH
Ta
θHS
Page 10 of 11
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