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參數(shù)資料
| 型號： | PKM4319EPIHS |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 37.5 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, QUARTER BRICK, 8 PIN |
| 文件頁數(shù)： | 29/37頁 |
| 文件大小： | 2036K |
| 代理商： | PKM4319EPIHS |
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EN/LZT 146 051 R7A Ericsson Power Modules, February 2007
PKM 4000E PI Datasheet
Thermal Consideration
General
The PKM 4000E 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 305x305mm, the DC/DC converter vertically
mounted on a 8 layer PCB with a size of 254x254mm .
Proper cooling can be verified by measuring the temperature
of selected devices . Peak temperature can occur at position
P1 and P2 . The temperature at these positions should not
exceed the recommended max values .
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 89% = 0 .89
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 .
E .g PKM 4510E PI at 1m/s:
B . 6 .1W × 5 .5°C/W = 33 .6°C
C .110°C - 33 .6°C = max ambient temperature is 76 .4°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) × 49 .5W = 6 .1W
1
0 .89
Position
Device
Tcritical
Max Value
P1
Transformer
Tcore
110C
P2
Mosfet
Tsurface
110C
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| PKM4418A PIOA | 制造商:Ericsson 功能描述: |
| PKM4418APIOB | 功能描述:DC/DC轉(zhuǎn)換器 1.2 Vdc 40A Iso Input 36-75V 48W RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PKM4418LDPINB | 功能描述:DC/DC轉(zhuǎn)換器 1.2 Vdc 40A Iso Input 36-75V 48W RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PKM44EP-0901 | 功能描述:音頻指示器及警報器 PKM44EP-0901 RoHS:否 制造商:PUI Audio 產(chǎn)品:Indicators 聲壓級:85 dB 音調(diào):Continuous 頻率:2300 Hz +/- 300 Hz 電壓額定值:5 VDC 電流額定值:30 mA 端接類型: 直徑:12 mm 安裝:Through Hole |
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