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參數(shù)資料
| 型號： | PKM4118HCPNBLASP |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 120 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT |
| 文件頁數(shù)： | 21/30頁 |
| 文件大小： | 596K |
| 代理商： | PKM4118HCPNBLASP |
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EN/LZT 146 035 R3D Ericsson Power Modules, June 2005
PKM 4000C Datasheet
Thermal Consideration
General
The PKM 4000C series DC/DC converters are designed
to operate in a variety of thermal environments, however
sufcient cooling should be provided to help ensure reliable
operation. Heat is removed by conduction, convection and
radiation to the surrounding environment. Increased airow
enhances the heat transfer via convection. The available
load current vs. ambient air temperature and airow 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 veried 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 = efciency of converter. E.g 90% = 0.90
2. Find the value of the thermal resistance for each product in
the diagram by using the airow 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. 18.3 W × 4.2 °C/W = 77 °C
C. 110 °C - 77 °C = max ambient temperature is 33 °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) × 165 W = 18.3 W
1
0.9
E.g PKM 4110C 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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| PKM4118LCPINB | 功能描述:DC/DC轉(zhuǎn)換器 120W 100A 1.2V 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PKM4119CPINB | 功能描述:DC/DC轉(zhuǎn)換器 2.5 Vdc 55A Iso Input 36-75V 137.5W 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PKM4119DPINB | 功能描述:DC/DC轉(zhuǎn)換器 2.5 Vdc 40A Iso Input 36-75V 100W 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(biāo)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(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PKM4202NG PI | 制造商:Ericsson 功能描述: |
| PKM4202NHPILB | 制造商:Ericsson 功能描述:QUARTER-BRICK SERIES, ISOLATED, THRU-HOLE, BUSS CONVERTER - Bulk |
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