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參數(shù)資料
| 型號(hào)： | PKJ4719PIT |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 75 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, HALF BRICK PACKAGE-9 |
| 文件頁數(shù)： | 29/39頁 |
| 文件大?。?/td> | 1007K |
| 代理商： | PKJ4719PIT |
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Limited Internal
PRODUCT SPECIFICATION
5 (6)
Prepared (also subject responsible if other)
No.
SEC/D EPHILIP
3/1301-BMR630
Approved
Checked
Date
Rev
Reference
SEC/D EPHILIP
(MICJOHN)
2006-1-27
A
Thermal Consideration
General
Ambient Temperature Calculation
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,
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 positions P1. 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 +100°C.
Position
Device
Designation
max value
P1
Baseplate
Tref
100 C
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 89.5 % = 0.895
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 PKJ4518 PIT at 2m/s:
1. ((
) -
1) × 54 W = 8.8 W
2. 8.8 W × 2.1°C/W = 18.5°C
3. 110 °C - 18.5°C = max ambient temperature is 91.5°C
The actual temperature will be dependent on several factors
such as the PCB size, number of layers and direction of
airflow.
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.
1
0.86
E
PKJ 4000 PI series
DC/DC converters, Input 36-75 V, Output 30A/150W
EN/LZT 146 309 R1B February 2006
Ericsson Power Modules AB
Technical Specication
35
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