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參數資料
| 型號： | AMC7580-X.XDDF |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩壓器的反向電流保護 |
| 文件頁數： | 10/12頁 |
| 文件大小： | 336K |
| 代理商： | AMC7580-X.XDDF |
AMC DOC. #: AMC7580_E (LF)
Feb 2005
Maximum Power Calculation:
AMC7580
7A L
OW
D
ROPOUT
R
EGULATOR
T
J(MAX)
– T
A(MAX)
θ
O
C): Maximum recommended junction temperature
P
D(MAX)
=
T
J
(
T
A
(
O
C/W): Junction-to-junction temperature thermal resistance of the package, and other heat dissipating
materials.
The maximum power dissipation of a single-output regulator
:
P
D(MAX)
=
[
(V
IN(MAX)
- V
OUT(NOM)
)
]
×
I
OUT(NOM)
+ V
IN(MAX)
×
I
Q
O
C): Ambient temperature of the application
θ
JA
(
Where: V
OUT(NOM)
= the nominal output voltage
I
OUT(NOM)
= the nominal output current, and
I
Q
=
the quiescent current the regulator consumes at I
OUT(MAX)
V
IN(MAX)
= the maximum input voltage
Then
θ
JA
= (150
O
C – T
A
) / P
D
Thermal consideration:
When power consumption is over about 1.2W( at 70
o
C ambient temperature), additional heat sink is required to control the
junction temperature below 125
O
C.
The junction temperature is: Tj
= P
D
(
θ
JT
+
θ
CS
+
θ
SA
) + T
A
P
D
:
Dissipated power.
θ
JT
:
Thermal resistance from the junction to the mounting tab of the package.
θ
CS:
Thermal resistance through the interface between the IC and the surface on which it is mounted. (typically,
θ
CS
< 1.0 °C / W)
θ
SA:
Thermal resistance from the mounting surface to ambient (thermal resistance of the heat sink).
If PC Board copper is going to be used as a heat sink, below table can be used to determine the appropriate size of
copper foil required. For multi-layered PCB, these layers can also be used as a heat sink. They can be connected with
several through hole vias.
PCB
θ
SA
(°C / W )
59
45
38
PCB heat sink size (mm
2
) 500
1000
1500
Recommended figure of PCB area used as a heat sink.
(Bottom View)
33
2000
27
3000
24
4000
21
5000
through hole vias
(Top View)
Copyright
2002, ADD Microtech Corp.
10
www.addmtek.com
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相關代理商/技術參數 |
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|---|---|
| AMC7581 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5A LOW DROPOUT REGULATOR |
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| AMC7581-2.5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5A LOW DROPOUT REGULATOR |
| AMC7581-3.3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5A LOW DROPOUT REGULATOR |
| AMC7581-5.0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5A LOW DROPOUT REGULATOR |
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