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参数资料
| 型号： | PKD4510ESPBI |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | SMD-24 |
| 文件页数： | 9/24页 |
| 文件大小： | 811K |
| 代理商： | PKD4510ESPBI |
Ericsson Internal
PRODUCT SPECIFICATION
4 (6)
Prepared (also subject responsible if other)
No.
ESKEVIN
3/1301-BMR628 Uen
Approved
Checked
Date
Rev
Reference
SEC/D (Julia You)
EYINGJI
2008-7-9
B
Thermal Consideration
General
The converters are designed to operate in different thermal
environments and sufficient cooling must be provided to
ensure reliable operation.
Cooling is achieved mainly by conduction, from the pins to
the host board, and convection, which is dependant on the
airflow across the converter. Increased airflow enhances the
cooling of the converter.
The Output Current Derating graph found in the Output
section for each model provides the available output current
vs. ambient air temperature and air velocity at Vin = 53 V.
The DC/DC converter is tested on a 254 x 254 mm,
35 m (1 oz), 8-layer test board mounted vertically in a wind
tunnel with a cross-section of 305 x 305 mm.
Proper cooling of the DC/DC converter can be verified by
measuring the temperature at positions P1, P2 and P3. The
temperature at these positions should not exceed the max
values provided in the table below.
Note that the max value is the absolute maximum rating
(non destruction) and that the electrical Output data is
guaranteed up to Tref +90°C.
See Design Note 019 for further information.
Position
Device
Designation
max value
P1
Case (topside) Tref
110 C
P2
Transformer
Tcore
110 C
P3
Mosfet
Tsurface
130 C
Definition of reference temperature (Tref)
The reference temperature is used to monitor the temperature
limits of the product. Temperatures above maximum Tref are
not allowed and may cause degradation or permanent
damage to the product. Tref is also used to define the
temperature range for normal operating conditions.
Tref is defined by the design and used to guarantee safety
margins, proper operation and high reliability of the module.
Ambient Temperature Calculation
By using the thermal resistance the maximum allowed
ambient temperature can be calculated.
1. The power loss is calculated by using the formula
((1/η) - 1) × output power = power losses (Pd).
η = efficiency of converter. E.g 83.5 % = 0.835
2. Find the thermal resistance (Rth) in the Thermal Resistance
graph found in the Output section for each model.
Calculate the temperature increase (T).
T = Rth x Pd
3. Max allowed ambient temperature is:
Max Tref - T.
E.g PKD 4218LE SI at 1m/s:
1. ((
) -
1) × 24 W = 4.7 W
2. 4.7 W × 5.2°C/W = 24.4°C
3. 110 °C — 24.4°C = max ambient temperature is 85.6°C
The actual temperature will be dependent on several factors
such as the PCB size, number of layers and direction of
airflow.
1
0.835
E
PKD 4000E SI series
DC/DC converters, Input 36-75 V, Output up to 20 A/50 W
EN/LZT 146 375 R2B July 2008
Ericsson Power Modules AB
17
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| PKD60B1/8 | 功能描述:旋钮和转盘 STRGHT 0.8" W/SKIRT SWITCH KNOB RoHS:否 制造商:Davies Molding 材料:Phenolic 设计:Set Screw 轴尺寸:0.25 in 直径:3/4 in 颜色:Black 指示器型式:Line |
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