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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： | 11/11页 |
| 文件大小： | 459K |
| 代理商： | ML7820A-FBE |
3. Thermal Design
( 1 )
Heat Producting
(1-1)
PLOSS-1 : heat producting by own operation
PLOSS-1 = Vin X IQ
(1-2)
PLOSS-2 : heat producing by output current and the input-output differential voltage.
Internal power transistor produces the hest mentioned following equation.
PLOSS-2
= (Vin-Vout) x Iout
(W)
Therefore, the total heat producing PLOSS is :
PLOSS
= PLOSS-1 + PLOSS-2
= Vin X IQ + (Vin-Vout) X Iout
(W)
( 2 )
Thermal Resistance
(2-1)
Definition of Thermal Resistance : θ
Thermal resistance (θ ) is a degree of heat radiation mentioned following equation.
= (T1 - T2)/P (℃ /W)
Heat Producing Quantity
: P (W)
Ambient Temperature or case temperature
:T2 (℃ )
Heat Source Temperature
:T1 (℃ )
(2-2)
Thermal resistance of TO-220
θjc :
θja :
thermal resistance between IC chip (junction point) and ambience.
Input voltage (Vin) and quiescent current (IQ) produce the heat mentioned below equation.
There are two kinds of heat producting (PLOSS-1, PLOSS-2) in three terminal regulator and the sum of
them is total heat producting of IC (PLOSS).
There are two kinds of thermal resistance of TO-220. One is "θjc" for the application with the heat
sink, the other is "θja" for the application without the heat sink.
thermal resistance between IC chip (junction point) and the package back side
contacting with the heat sink.
Input
GND
IN
OUT
Output
Vin
Vout
IQ
Iout
T1
T2
P(W)
Rp
T1 > T2
Page 9 of 11
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