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参数资料
| 型号： | PMA4118HSF/C |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 18 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | SMT-14 |
| 文件页数： | 10/21页 |
| 文件大小： | 363K |
| 代理商： | PMA4118HSF/C |
18
PMA 4000 Series Datasheet
EN/LZT 146 012 R3A Ericsson Power Modules, November 2003
Thermal Considerations
General
The PMA 4000 Series DC/DC regulators are designed
to operate in a variety of thermal environments, however
sufficient cooling should be provided to help ensure reliable
operation. Heat is removed by conduction, convection and
radiation to the surrounding environment. Increased airflow
enhances the heat transfer via convection. The available load
current vs. ambient air temperature and airflow at Vin=3.3 V
for each model is according to the information given under the
output section.
Proper cooling can be verified by measuring the temperature
on top of the case.
Calculation of ambient temperature
By using the thermal resistance the maximum allowed
ambient temperature can be calculated.
A. The powerloss is calculated by using the formula
((1/
η) - 1) × output power = power losses.
η = efciency of regulator. Example: 95% = 0.95
B. Find the value of the thermal resistance Rth C-A in the dia-
gram by using the airow speed at the module. Take the ther-
mal resistance × powerloss to get the temperature increase.
0.0
0.5
1.0
1.5
2.0
2.5
3.0
5
10
15
20
[m/s]
[°C/W]
Rth C-A
Thermal resistance vs. airspeed measured at the regulator.
C. Max allowed calculated ambient temperature is:
Max TC of DC/DC regulator - temperature increase.
Example: PMA 4118H at 1m/s:
B. 2.45W × 11.7°C/W = 28.7°C
C.110°C - 28.7°C = max ambient temperature is 81°C
The real temperature will be dependent on several factors,
like PCB size and type, direction of airow, air turbulence
etc. It is recommended to verify the temperature by testing.
A. ((1/0.88) - 1) × 18W = 2.45W
1
2
3
4
5
6
Top view
14
13
12
11
10
9
8
7
Reference area TC
TCmax = 110°C
Test conditions:
The test is done in a wind tunnel with a cross section of
305x305 mm, the DC/DC regulator horisontally mounted on a
2 layer PCB with a size of 230x160 mm.
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