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參數(shù)資料
| 型號(hào)： | PKM4118GCPINB |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 126 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 1092K |
| 代理商： | PKM4118GCPINB |
1
EN/LZT 146 035 R7A Ericsson Power Modules, February 2007
PKM 4000C Datasheet
Thermal Consideration
General
The PKM 4000C series DC/DC converters 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 =53 V for each model is according to the information
given under the output section . The test is done in a
wind tunnel with a cross section of 305 x 305 mm, the
DC/DC converter vertically mounted on a 16 layer Pcb
with a size of 254 x 254 mm, each layer with 35 m (1
oz) copper. Proper cooling can be verified by measuring
the temperature of selected devices . Peak temperature
can occur at positions P1 - P4 . The temperature at these
positions should not exceed the recommended max values .
Note that the recommended max value is the absolute
maximum rating (non destruction) and that the electrical
output data is guaranteed up to TPcb +90 °C .
Calculation of ambient temperature
By using the thermal resistance the maximum allowed
ambient temperature can be calculated .
1 . The powerloss is calculated by using the formula
((1/
η) - 1) × output power = power losses .
η = efficiency of converter. E .g 90% = 0 .90
2 . Find the value of the thermal resistance for each product in
the diagram by using the airflow speed at the output section
of the converter. Take the thermal resistance x powerloss to
get the temperature increase .
3 . Max allowed calculated ambient temperature is: Max
TPcb of DC/DC converter – temperature increase .
B . 13 .3 W × 4 .5 °C/W = 60 °C
C . 110 °C - 60 °C = max ambient temperature is 50 °C
The real temperature will be dependent on several factors,
like Pcb size and type, direction of airflow, air turbulence etc .
It is recommended to verify the temperature by testing .
A . ((
) - 1) × 120 W = 13 .3 W
1
0 .9
E .g PKM 4118HC PINB at 1m/s:
Position
Device
TC
Recommended
max value
P1
Pcb
110
°C
P2
Transistor
Tsurface
120
°C
P3
Transistor
Tsurface
120
°C
P4
Transformer
Tsurface
130
°C
Input side
Output side
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