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參數資料
| 型號： | LX8415-25CSTT |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| 中文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 1.3 V DROPOUT, PDSO4 |
| 封裝： | PLASTIC, SOT-223, 3 PIN |
| 文件頁數： | 6/7頁 |
| 文件大?。?/td> | 191K |
| 代理商： | LX8415-25CSTT |
0.5A L
O W
D
ROPOUT
P
OSITIVE
R
EGULATORS
LX8415-xx
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1999
Rev. 0.4 1/99
6
P
R E L I M I N A R Y
D
A T A
S
H E E T
A P P L I C AT I O N N O T E S
THERMAL CONSIDERATIONS
(continued)
Example
Given: V
IN
= 5.0V ±5%, V
= 2.5V ±3%
I
OUT
= 0.5A, T
= 55°C, T
= 125°C
R
θ
JT
= 15°C/W, R
θ
TS
= 5°C/W
Find: The size of a square area of 1oz. copper circuit-
board trace-foil that will serve as a heatsink,
adequate to maintain the junction temperature of the
LX8415 in the ST (SOT-223) package within
specified limits.
Solution: The junction temperature is:
T
J
= P
D
(R
θ
JT
+ R
θ
CS
+ R
θ
SA
) + T
A
where: P
D
≡
Dissipated power.
R
θ
JT
≡
Thermal resistance from the junction to the
mounting tab of the package.
R
θ
TS
≡
Thermal resistance through the interface
between the IC and the surface on which
it is mounted.
R
θ
SA
≡
Thermal resistance from the mounting surface
of the heatsink to ambient.
T
S
≡
Heat sink temperature.
T
J
T
C
R
q
JT
R
q
CS
T
S
T
A
R
q
SA
T
J
- T
A
P
D
3.1°C/W
R
θ
SA
- 22.3°C/W
First, find the maximum allowable thermal resistance of the
heat sink:
P
D
P
D
=
[
[V
IN
* (1 + Tol
VIN
)] - [V
OUT
* (1 - Tol
VOUT
)]
]
* I
OUT
=
1.4W
R
θ
SA
=
- (R
θ
JT
+ R
θ
TS
) , R
θ
SA
=
29.6°C/W
A test was conducted to determine the thermal characteristics of
1 oz. copper circuit-board trace material. The following equation
describes the observed relationship between the area of a square
copper pad, and the thermal resistance from the tab of a SOT-223
package soldered at the center of the pad to ambient.
Area
SINK
=
in
2
Substituting the value for R
θ
SA
calculated above, we find that a
square pad with area:
Area
SINK
=
0.43 in
2
(0.66" x 0.66"),
280mm
2
(17 x 17 mm)
will be required to maintain the LX8415 junction temperature
within specified limits.
相關PDF資料 |
PDF描述 |
|---|---|
| LX8415-33CSTT | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| LX8554-XX | 5A EXTREMELY LOW DROPOUT POSITIVE REGULATORS |
| LX8554-00CDD | 5A EXTREMELY LOW DROPOUT POSITIVE REGULATORS |
| LX8554-00CP | 5A EXTREMELY LOW DROPOUT POSITIVE REGULATORS |
| LX8554-33 | 5A EXTREMELY LOW DROPOUT POSITIVE REGULATORS |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LX8415-33 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:0.5 A LOW DROPOUT POSITIVE REGULATORS |
| LX8415-33CST | 功能描述:IC REG LDO 3.3V SOT-223 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩(wěn)壓器拓撲結構:正，固定式和可調式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標準）:1.1V @ 1A 穩(wěn)壓器數量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應商設備封裝:PPAK 包裝:管件 其它名稱:497-3576-5 |
| LX8415-33CSTT | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Positive Fixed Voltage Regulator |
| LX8415-XX | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:0.5 A LOW DROPOUT POSITIVE REGULATORS |
| LX8554 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Adjustable Voltage Regulator |
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