PKB4610PINBLA Ericsson Power Modules, PKB4610PINBLA Datasheet - Page 41

• Manufacturer Part Number: PKB4610PINBLA
• Description: DC/DC CONVERTERS
• Manufacturer: Ericsson Power Modules
• Type: Step Downr

Specifications of PKB4610PINBLA

• Output Current: 20 A
• Output Voltage: 3.3 V
• Input Voltage: 48 V
• Number Of Outputs: 1
• Output Power: 66(Min) W

Thermal Consideration continued
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.
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).
2. 9.26 W × 6.3°C/W = 58.3°C
3. 120 °C — 58.3°C = max ambient temperature is 61.6°C
The actual temperature will be dependent on several factors
such as the PCB size, number of layers and direction of
airflow.
η = efficiency of converter. E.g 89.0 % = 0.89
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 PKB 4711 SINB at 1m/s:
1.
∆T = Rth x Pd
Prepared (also subject responsible if other)
EJUNGYA
Approved
SEC/D (Julia You)
PKB 4000 series
DC/DC converters, Input 36-75 V, Output 30 A/90 W
ref
((
is defined by the design and used to guarantee safety
0.89
1
) -
1) × 75 W = 9.26 W
ref
is also used to define the
ref
)
Checked
ESHUHAN
ref
are
Connections
PRODUCT SPECIFICATION
No.
3/1301-BMR 636 Uen
Date
2008-1-11
Pin
1
2
3
4
5
6
7
8
Designation
+In
RC
-In
-Out
-Sen
Vadj
+Sen
+Out
Technical Specifi cation
EN/LZT 146 394 R5A August 2009
© Ericsson AB
Rev
A
Reference
Function
Positive input
Remote control
Negative input
Negative output
Negative remote sense
Output voltage adjust
Positive remote sense
Positive output
4 (5)
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