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參數(shù)資料
| 型號： | ATR2805SF/CH |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 3/12頁 |
| 文件大小： | 116K |
| 代理商： | ATR2805SF/CH |
11
Thermal Management
Assuming that there is no forced air flow, the
package termperature rise above ambient (
T)
may be calculated using the following expression:
T 80 A -0.7 p 0. 85 ( °C)
where A = the effective surface area in square
inches (including heat sink if used;) P = power
dissipation in watts.
The total surface area of the ATR standard
package is 7.34 square inches. If a worse case full
load efficiency of 76% is assumed, then the case
temperature rise of an ATR 2805S can be calcu-
lated as follows:
P = P
OUT [
1
- 1
] = 30 [ 1 - 1] = 9.5 W
T = 80 (7.34)-0.7 (9.5)0.85 = 134°C
Hence, if T
AMBIENT = +25°C, the DC/DC converter
case temperature will be approximately 159°C if
no heat sink or air flow is provided.
To calculate the heat sink area required to
maintain a specific case temperature rise, the
above equation may be manipulated as follows:
A
HEAT SINK =
[
T
] -1.43 - A
PKG
80P 0.85
As an example, if a maximum case temperature
rise of 50°C above ambient is desired, then the
required effective heat sink area is:
A
HEAT SINK =
[ 50
] -1.43 - 7.34 = 22.9 in.2
80 (9.5) 0.85
Eff
.76
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