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参数资料
| 型号： | UVQ-18/5.6-D24NB-C |
| 厂商： | MURATA POWER SOLUTIONS INC |
| 元件分类： | 电源模块 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-8 |
| 文件页数： | 16/25页 |
| 文件大小： | 3470K |
| 代理商： | UVQ-18/5.6-D24NB-C |
Figure 7. Model UVQ Heatsink Assembly Diagram
When assembling these kits onto the converter, include ALL kit hardware to
assure adequate mechanical capture and proper clearances. Thread relief is
0.090" (2.3mm).
Thermal Performance
The HS-QB25-UVQ heatsink has a thermal resistance of 12 °C/Watt of internal
heat dissipation with “natural convection” airflow (no fans or other mechanical
airflow) at sea level altitude. This thermal resistance assumes that the heatsink
is firmly attached using the supplied thermal pad and that there is no nearby
wall or enclosure surface to inhibit the airflow. The thermal pad adds a negli-
gible series resistance of approximately 0.5°C/Watt so that the total assembled
resistance is 12.5°C/Watt.
Power Dissipation [Pd] = Power In – Power Out [1]
Power Out / Power In = Efficiency [in %] / 100 [2]
Power Dissipation [Pd] = Power In x (1 –Efficiency%/100) [3]
Power Dissipation [Pd] = Power Out x (1 / (Efficiency%/100) - 1) [4]
Efficiency of course varies with input voltage and the total output power.
Please refer to the Performance Curves.
Since many applications do include fans, here is an approximate equation to
calculate the net thermal resistance:
RQ [at airflow] = RQ [natural convection] / (1 + (Airflow in LFM) x
[Airflow Constant]) [5]
Where,
R
Q [at airflow] is the net thermal resistance (in °C/W) with the amount of
airflow available and,
R
Q [natural convection] is the still air total path thermal resistance or in this
case 12.5°C/Watt and,
“Airflow in LFM” is the net air movement flow rate immediately at the con-
verter.
This equation simplifies an otherwise complex aerodynamic model but is a
useful starting point. The “Airflow Constant” is dependent on the fan and enclo-
sure geometry. For example, if 200 LFM of airflow reduces the effective natural
convection thermal resistance by one half, the airflow constant would be
0.005. There is no practical way to publish a “one size fits all” airflow constant
because of variations in airflow direction, heatsink orientation, adjacent walls,
enclosure geometry, etc. Each application must be determined empirically and
the equation is primarily a way to help understand the cooling arithmetic.
This equation basically says that small amounts of forced airflow are quite
effective removing the heat. But very high airflows give diminishing returns.
Conversely, no forced airflow causes considerable heat buildup. At zero airflow,
cooling occurs only because of natural convection over the heatsink. Natural
convection is often well below 50 LFM, not much of a breeze.
While these equations are useful as a conceptual aid, most users find it
very difficult to measure actual airflow rates at the converter. Even if you know
the velocity specifications of the fan, this does not usually relate directly to
the enclosure geometry. Be sure to use a considerable safety margin doing
thermal analysis. If in doubt, measure the actual heat sink temperature with
a calibrated thermocouple, RTD or thermistor. Safe operation should keep the
heat sink below 100°C.
Calculating Maximum Power Dissipation
To determine the maximum amount of internal power dissipation, find the
ambient temperature inside the enclosure and the airflow (in Linear Feet per
Minute – LFM) at the converter. Determine the expected heat dissipation using
Be aware that we need to handle only the internal heat dissipation, not the
full power output of the converter. This internal heat dissipation is related to the
efficiency as follows:
MDC_UVQ Models.B04 Page 23 of 25
UVQ Series
Low Profile, Isolated Quarter Brick
2.5–40 Amp DC/DC Converters
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UVQ-2.5/35-D24N | 制造商:Murata Power Solutions 功能描述:Module DC-DC 1-OUT 2.5V 35A 87.5W 8-Pin Quarter-Brick |
| UVQ-2.5/35-D24NB-C | 功能描述:DC/DC转换器 87.5W 24V - 2.5V 35A NEG POL BASEPLATE 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: |
| UVQ-2.5/35-D24N-C | 功能描述:DC/DC转换器 87.5W 24V - 2.5V 35A NEGATIVE POLARITY 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: |
| UVQ-2.5/35-D24P | 制造商:Murata Power Solutions 功能描述:Module DC-DC 1-OUT 2.5V 35A 87.5W 8-Pin Quarter-Brick |
| UVQ-2.5/35-D24PB-C | 功能描述:DC/DC转换器 87.5W 24V - 2.5V 35A POS POL BASEPLATE 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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