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DNL04S0A0R20PFD 参数 Datasheet PDF下载

DNL04S0A0R20PFD图片预览
型号: DNL04S0A0R20PFD
PDF下载: 下载PDF文件 查看货源
内容描述: 负载的非隔离点DC / DC电源模块: 8.3-14Vin , 0.75-5.0V / 20A出 [Non-Isolated Point of Load DC/DC Power Modules: 8.3-14Vin, 0.75-5.0V/20A out]
分类和应用: 电源电路
文件页数/大小: 16 页 / 764 K
品牌: DELTA [ DELTA ELECTRONICS, INC. ]
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THERMAL CONSIDERATIONS  
FEATURE DESCRIPTIONS (CON.)  
Thermal management is an important part of the system  
design. To ensure proper, reliable operation, sufficient  
cooling of the power module is needed over the entire  
temperature range of the module. Convection cooling is  
usually the dominant mode of heat transfer.  
Ratio-Metric  
Ratio–metric (Figure 37) is implemented by placing the  
voltage divider on the TRACK pin that comprises R1 and  
R2, to create a proportional voltage with VoPS1 to the  
Track pin of PS2.  
Hence, the choice of equipment to characterize the  
thermal performance of the power module is a wind  
tunnel.  
For Ratio-Metric applications that need the outputs of  
PS1 and PS2 reach the regulation set point at the same  
time  
Thermal Testing Setup  
The following equation can be used to calculate the value  
of R1 and R2.  
Delta’s DC/DC power modules are characterized in  
heated vertical wind tunnels that simulate the thermal  
environments encountered in most electronics  
equipment. This type of equipment commonly uses  
vertically mounted circuit cards in cabinet racks in which  
the power modules are mounted.  
The suggested value of R2 is 10k.  
Vo,PS 2  
R2  
=
Vo,PS1 R + R2  
1
PS1  
PS2  
The following figure shows the wind tunnel  
characterization setup. The power module is mounted  
on a test PWB and is vertically positioned within the  
wind tunnel. The height of this fan duct is constantly kept  
at 25.4mm (1’’).  
Vin  
Vin  
VoPS1  
VoPS2  
R1  
TRACK  
On/Off  
R2  
On/Off  
Thermal Derating  
Heat can be removed by increasing airflow over the  
module. To enhance system reliability, the power  
module should always be operated below the maximum  
operating temperature. If the temperature exceeds the  
maximum module temperature, reliability of the unit may  
be affected.  
The high for positive logic  
The low for negative logic  
PW B  
FANCING PWB  
MODULE  
AIR VELOCITY  
AND AM BIENT  
TEMPERATURE  
SURED BELOW  
THE MODULE  
AIR FLOW  
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)  
Figure 38: Wind tunnel test setup  
DS_DNL10SMD_07182012  
12