Ericsson Internal
E
EMAOLII
PRODUCT SPECIFICATION
7 (8)
Prepared (also subject responsible if other)
No.
30/1301-BMR 456 Uen
39
Technical Specification
BMR456 series Fully regulated AdvCahneckceed d Bus Converters
Approved
Date
Rev
Reference
1/28701-FGC 101 1823 revD February 2013
SEC/D (Julia You)
EZHIXZH
2013-02-06
F
© Ericsson AB
Input 36-75 V, Output up to 39 A / 468 W
The actual temperature will be dependent on several factors
such as the PWB size, number of layers and direction of
airflow.
Connections (Top view)
Open frame
Pin
1
Designation
+In
Function
Positive Input
2
RC
Remote Control
Case to GND (optional)
Negative Input
3
Case
-In
4
5
-Out
Negative Output
Positive Remote Sense
Negative Remote Sense
Address pin 0
Base plate
6
S+
(Best air flow direction is from positive to negative pins.)
7
S-
Ambient Temperature Calculation
8
SA0
For products with base plate the maximum allowed ambient
temperature can be calculated by using the thermal
resistance.
9
SA1
Address pin 1
10
11
12
13
14
15
16
SCL
PMBus Clock
SDA
PG
PMBus Data
1. The power loss is calculated by using the formula
((1/η) - 1) × output power = power losses (Pd).
η = efficiency of product. E.g. 95 % = 0.95
Power Good output
PMBus ground
DGND
SALERT
CTRL
+Out
PMBus alert signal
PMBus remote control
Positive Output
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 (∆T).
∆T = Rth x Pd
3. Max allowed ambient temperature is:
Max TP1 - ∆T.
E.g. BMR 456 0100/002 at 2m/s:
1
1. ((
) - 1) × 468 W = 24.6 W
0.95
2. 24.6 W × 2.8°C/W = 69.0°C}
3. 125 °C - 69.0°C = max ambient temperature is 56°C
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