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參數(shù)資料
| 型號： | PKM4304BPIHS |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 298.75 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-6 |
| 文件頁數(shù)： | 8/21頁 |
| 文件大小： | 1790K |
| 代理商： | PKM4304BPIHS |
Ericsson Internal
PRODUCT SPECIFICATION
4 (6)
Prepared (also subject responsible if other)
No.
EXUEFYA
3/1301-BMR 653 Uen
Approved
Checked
Date
Rev
Reference
EQUENXU
2009-11-30
J
Thermal Consideration
General
The product is designed to operate in various 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. The size and copper thickness of
the host board will have impact on the Conduction cooling.
Convection cooling is dependant on the airflow across the
DC/DC converter. Increased airflow enhances the cooling of
the DC/DC 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), 16-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 reference point. The
temperature at these positions should not exceed the max
values provided in the table below.
Position
Device
Designation
max value
Reference
PCB
-
125°C
Top view
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 reliability of the module.
Ambient Temperature Calculation
By using the thermal resistance the estimated 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 96 % = 0.96
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:
Ta=Max Tref -
T.
E.g. PKM4204B PI at 53Vin 20Aout 1.5 m/s
1. ((1/0.96) – 1) x 240W = 10 W
2. 10 W x 3.5
o C = 35o C
3. 125
o C – 35o C = max ambient temperature is 90o C
The actual temperature will be dependent on several factors
such as the PCB size, number of layers and direction of
airflow.
E
PKM 4000B PI series
Intermediate Bus Converters
Input 36-75 V, Output up to 33 A / 380 W
EN/LZT 146 305 R5C March 2010
Ericsson AB
Technical Specication
16
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