PKJ4316API Ericsson Power Modules, PKJ4316API Datasheet - Page 24

• Manufacturer Part Number: PKJ4316API
• Description: DC/DC Converters & Regulators 28Vdc 12.4A Isolated Input 36 -75V 350W
• Manufacturer: Ericsson Power Modules
• Series: PKJr

Specifications of PKJ4316API

• Output Power: 350 W
• Input Voltage Range: 36 V to 75 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 28.2 V
• Output Current (channel 1): 12.4 A
• Isolation Voltage: 1.5 KV
• Package / Case Size: Half Brick
• Output Type: Isolated
• Product: Isolated
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Proper cooling of the product can be verified by measuring the
temperature at positions P1, P2. The temperature at these
positions should not exceed the max values provided in the
table below. The number of points may vary with different
thermal design and topology.
See Design Note 019 for further information.
Base plate
Definition of reference temperature T
The reference temperature is used to monitor the temperature
limits of the product. Temperatures above maximum T
meassured at the reference point P1 are not allowed and may
cause degradation or permanent damage to the product. T
also used to define the temperature range for normal operating
conditions. T
safety margins, proper operation and high reliability to the
product.
E
Position
P1
P2
Prepared (also subject responsible if other)
EGLANDY
Approved
SEC/D (Betty Wu)
PKJ 4000 RFPA series Direct Converters
Input 36-75 V, Output up to 12.4 A / 350 W
P1
Description
Reference Point, Baseplate
PCB
is defined by the design and used to guarantee
P1
Temp. limit
120º C
110º C
Checked
EQUENXU
P1
,
P1
is
Ambient Temperature Calculation
For products with base plate the maximum allowed ambient
temperature can be calculated by using the thermal resistance.
1. The power loss is calculated by using the formula
((1/η) - 1) × output power = power losses (Pd).
η = efficiency of product. 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. Note that
the thermal resistance can be significantly reduced if a
heat sink is mounted on the top of the base plate.
Calculate the temperature increase (ΔT).
3. Max allowed ambient temperature is:
Max T
The actual temperature will be dependent on several factors
such as the PCB size, number of layers and direction of
airflow.
Ericsson Internal
PRODUCT SPECIFICATION
No.
3/1301-BMR 630 03/7 Uen
Date
2009-02-16
ΔT = Rth x Pd
E.g PKJ 4316 API at 2m/s:
1.
2. 52.3 W × 1.8°C/W = 94.1°C
3. 120 °C –94.1°C = max ambient temperature is 25.9°C.
((
0.87
P1
1
- ΔT.
) -
1) × 350 W = 52.3 W
Technical Specification
EN/LZT 146 367 R3B September 2009
© Ericsson AB
Rev
C
Reference
4 (6)
24