PKJ4113APIT Ericsson Power Modules, PKJ4113APIT Datasheet - Page 35

• Manufacturer Part Number: PKJ4113APIT
• Description: DC/DC Converters & Regulators 12 Vdc 12.5A Iso Input 36-75V 150W
• Manufacturer: Ericsson Power Modules
• Series: PKJr

Specifications of PKJ4113APIT

• Product: Isolated
• Output Power: 150 W
• Input Voltage Range: 36 V to 75 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 12 V
• Output Current (channel 1): 12.5 A
• Isolation Voltage: 1.5 KV
• Package / Case Size: Half Brick
• Output Type: Isolated
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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 V
The DC/DC converter is tested on a 254 x 254 mm,
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 T
Definition of reference temperature (T
The reference temperature is used to monitor the temperature
limits of the product. Temperatures above maximum T
not allowed and may cause degradation or permanent
damage to the product. T
temperature range for normal operating conditions.
T
margins, proper operation and high reliability of the module.
16-layer test board mounted vertically in a wind tunnel with a
Prepared (also subject responsible if other)
SEC/D EPHILIP
Approved
SEC/D EPHILIP
PKJ 4000 PI series
DC/DC converters, Input 36-75 V, Output 30A/150W
ref
Position
P
1
is defined by the design and used to guarantee safety
Device
Baseplate
ref
+100°C.
ref
Designation
T
is also used to define the
ref
ref
)
max value
100º C
in
Checked
(MICJOHN)
= 53 V.
ref
are
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 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).
3. Max allowed ambient temperature is:
Max Tref - ∆T.
E.g PKJ4518 PIT at 2m/s:
1.
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.
PRODUCT SPECIFICATION
No.
3/1301-BMR630
Date
2006-1-27
∆T = Rth x Pd
((
0.86
1
) -
1) × 54 W = 8.8 W
Technical Specifi cation
EN/LZT 146 309 R1B February 2006
© Ericsson Power Modules AB
Rev
A
Reference
5 (6)
35