Ericsson Internal
PRODUCT SPECIFICATION 3 (5)
Prepared (also subject responsible if other) No.
MICMALE 3/1301-BMR 603 1203/1 Uen
Approved Checked Date Rev Reference
EAB/FJB/GKF (Natalie Johansson) (MICANWO)
2008-09-05 C
Operating information continued
Parallel Operation
Two or more converters may be paralleled for increased
power capability. No external current sharing circuits are
required. The direct paralleling is possible thanks to high
initial output voltage accuracy and decreasing temperature
characteristics of the output voltages.
Over Temperature Protection (OTP)
The converters are protected from thermal overload by an
internal over temperature shutdown circuit.
When T
ref
as defined in thermal consideration section
exceeds 115°C the converter will shut down. The DC/DC
converter will make continuous attempts to start up (non-
latching mode) and resume normal operation automatically
when the temperature has dropped >10°C below the
temperature threshold.
Over Voltage Protection (OVP)
The converters have output over voltage protection that will
shut down the converter in over voltage conditions. The
converter will make continuous attempts to start up (non-
latching mode) and resume normal operation automatically
after removal of the over voltage condition.
Over Load Protection (OLP)
The converters include load limiting circuitry for protection at
continuous overload. This function is implemented on the
primary side of the module.
The output voltages will decrease towards zero if the total
output power (sum of loads on all three outputs) exceeds the
maximum allowed output power.
Note that output 1 (78V) is not short circuit protected in case
of low loads on outputs 2 and 3.
The load distribution should be designed for the maximum
output short circuit current specified.
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
in
= 53 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 case temperature close to the reference point.at
positions P1, P2 and P3. 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
ref
+95°C.
See Design Note 019 for further information.
Position Device Designation max value
P1 MOSFET T1 120º C
P2 Diode D4 110º C
P3 Diode D5 110º C
E
BMR 603 1203/1
DC/DC converters, Input 40-72 V, Output 78/-52/-33 V/32W
EN/LZT 146 393 R1E September 2008
© Ericsson Power Modules AB
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