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参数资料
| 型号： | PKB4711PIPNBM |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 75 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, PACKAGE-8 |
| 文件页数： | 35/42页 |
| 文件大小： | 2514K |
| 代理商： | PKB4711PIPNBM |
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Thermal Consideration
General
The PKB 4000 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 8 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, P2 and
P3 . 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 89 .5% = 0 .895
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 con-
verter. 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 . 7 .74 W × 5 .0 °C/W = 38 .7 °C
C . 110 °C - 38 .7 °C = max ambient temperature is 71 .3 °C
The real temperature will be dependent on several factors, like PCB
size and type, direction of airflow, air turbulence etc . It is recommen-
ded to verify the temperature by testing .
A . ((
) - 1) × 66 W = 7 .74 W
1
0 .895
E .g PKB 4610 PINB at 1m/s:
Output side
Input side
AIRFLOW
P3
P2
P1
Position
Device
Tcritical
Recommended
max value
P1
Pcb
110 °C
P2
mosfet
Tsurface
120 °C
P3
mosfet
Tsurface
120 °C
EN/LZT 146 033 R9A Ericsson Power Modules, March 2007
PKB 4000 Datasheet
40
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PKB4711SINB | 功能描述:DC/DC转换器 75W 36-75Vin 5V 15A SMT RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PKB4713PINB | 功能描述:DC/DC转换器 12 Vdc 6A Iso Input 36-75V 72W RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PKB4713PINBLA | 制造商:Ericsson 功能描述:DC/DC PS SGL-OUT 12V 6A 72W - Bulk 制造商:Ericsson 功能描述:DC/DC POWER MODULE |
| PKB4713PINBMLA | 制造商:Ericsson 功能描述:12V, 6A / 72W PKB SERIES EIGHTH BRICK |
| PKB4713SINB | 功能描述:DC/DC转换器 72W 36-75Vin 12V 6A SMT RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
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