PKB4110CPI Ericsson Power Modules, PKB4110CPI Datasheet - Page 32

• Manufacturer Part Number: PKB4110CPI
• Description: DC/DC Converters & Regulators 3.3Vdc 40A Isolated Input 36-75V 132W
• Manufacturer: Ericsson Power Modules
• Series: PKB-Cr

Specifications of PKB4110CPI

• Product: Isolated
• Output Power: 132 W
• Input Voltage Range: 36 V to 75 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 3.3 V
• Output Current (channel 1): 40 A
• Isolation Voltage: 2.25 KV
• Package / Case Size: Eighth 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,
35 µm (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 or P2 ( see note 1).
The temperature at these positions should not exceed the max
values provided in the table below.
See Design Note 019 for further information.
Thermal Consideration continued
The PKB4000C series DC/DC converters can be ordered with
a heatsink (HS) option. The HS option is intended to be
mounted on a cold wall
the converter
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
range for normal operating conditions.
T
margins, proper operation and high reliability of the module.
E
Position
P
P
Prepared (also subject responsible if other)
ESHUHAN
Approved
PKB4000C series
DC/DC converters, Input 36-75 V, Output 60A/144W
p1
1
2
is defined by the design and used to guarantee safety
Device
Mosfet
Ind. core
and further improve the cooling of the converter.
p1
is also used to define the temperature
P2
or heatsink
Designation
T
T
p1
p2
P1
to transfer heat away from
p1
)
in
max value
125º C
125º C
= 53 V.
Checked
EZHEWNG
p1
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 (ΔT).
3. Max allowed ambient temperature is:
Max Tp1 - ΔT.
E.g. PKB 4110C PI at 1m/s:
1.
2. 14.7 W × 4.6°C/W = 68°C
3. 125 °C – 68°C = max ambient temperature is 57°C
The actual temperature will be dependent on several factors
such as the PCB size, number of layers and direction of
airflow.
Note 1
P2 is the limiting component (Tp1) used for thermal derating for
PKB4113C. P1 is used for the rest of the modules in the PKB-C family.
Ericsson Internal
PRODUCT SPECIFICATION
No.
3/1301-BMR 655 Uen
Date
2009-2-13
ΔT = Rth x Pd
((
0.90
1
) -
1) × 132 W = 14.7 W
Technical Specification
EN/LZT 146 377 R3H
© Ericsson AB
Rev
PC1
Reference
Feb 2009
4 (6)
32