Ericsson Internal
PRODUCT SPECIFICATION 1 (4)
Prepared (also subject responsible if other) No.
SEC/S Kevin Zhou 1/1301- BMR 453 0108
Approved Checked Date Rev Reference
SEC/S Kevin Zhou 2011-09-09 B
Key Features
• Industry standard Quarter-brick footprint
57.9 x 36.8 x 24.5 mm (2.28 x 1.45 x 0.9 65 in)
• High efficiency, typ. 96.7% at 12.45 Vout half load
• 1500 Vdc input to output isolation
• Meets safety requirements according to IEC/EN/UL
60950-1
• MTBF 1.2 Mh
General Characteristics
• Output over voltage protection
• Input under voltage shutdown
• Over temperature protection
• Over current protection
• Remote control
• Highly automated manufacturi ng ensures quality
• ISO 9001/14001 certified supplier
Safety Approvals Design for Environment
Meets requirements in high-
temperature lead-free soldering
processes.
Ericsson Internal
TABLE OF CONTENTS 1 (1)
Prepared (also subject responsible if other) No.
SEC/S Kevin Zhou 00152-ENLZT146444
Approved Checked Date Rev Reference
SEC/S Kevin Zhou 2011-07-22 A D
Contents
Ordering Information .............................................................2
General Information .............................................................2
Safety Specification .............................................................3
Absolute Maximum Ratings .............................................................4
Electrical Specification
12.45V, 60A / 711W BMR 453 0108/014............................... 5
EMC Specification .............................................................9
Operating Information ...........................................................10
Thermal Consideration ........................................................... 12
Connections ...........................................................13
Mechanical Information ...........................................................14
Soldering Information ...........................................................15
Delivery Information ...........................................................15
Product Qualification Specification ........................................................... 16
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
Ericsson Internal
PRODUCT SPECIFICATION 2 (4)
Prepared (also subject responsible if other) No.
SEC/S Kevin Zhou 1/1301- BMR 453 0108
Approved Checked Date Rev Reference
SEC/S Kevin Zhou 2011-09-09 B
Ordering Information
Product program Output
BMR4530108/014 12.45 V / 60 A, 711 W
Product Number and Packaging
BMR453 n1 n2 n3 n4 / n5 n6 n7
Mechanical
pin option x /
Mechanical
option x /
Hardware option x x /
Configuration file / x x x
Optional
designation Description
n1
n2
n3 n4
n5 n6 n7
Packaging
0 = Standard pin length 5.33 mm
1 = Baseplate
2 = Baseplate with GND-pin(Pin 3 only
included with this ordering option)
08 = 8.1-13.2 Vout Without digital interface
014 = 12.45 V with 0.6 V droop load sharing
function configuration
20 converters/tray/box PE foam dissipative
Example: Product number BMR4530108/14 equals a Through hole mount
lead length 5.33 mm, baseplate, without digital interface with 12.45 V
standard configuration variant.
For application specific configurations contact your local Ericsson Power
Modules sales representative.
General Information
Reliability
The failure rate (λ) and mean time between failures
(MTBF= 1/λ) is calculated at max output power and an
operating ambient temperature (TA) of +40°C. Ericsson
Power Modules uses Telcordia SR-332 Issue 2 Method 1 to
calculate the mean steady-state failure rate and standard
deviation (σ).
Telcordia SR-332 Issue 2 also provides techniques to
estimate the upper confidence leve ls of failure rates based
on the mean and standard deviation.
Mean steady-state failure rate, λ Std. deviation, σ
804 nFailures/h 61 nFailures/h
MTBF (mean value) for the BMR453 series = 1.2 Mh.
MTBF at 90% confidenc e level = 1.0 Mh
Compatibility with RoHS requirements
The products are compatible wit h the rel evant clauses and
requirements of the RoHS directive 2002/95/EC and have a
maximum concentration value of 0.1% b y weight in
homogeneous materials for lead, mercury, hexavalent
chromium, PBB and PBDE and of 0.01% by weight in
homogeneous materials for cadmi um.
Exemptions in the RoHS directive utilized in Ericsson
Power Modules products are found in the Statement of
Compliance document.
Ericsson Power Modules fulfills and will continuously fulfill
all its obligations under regulation (EC) No 1907/2006
concerning the registration, evaluation, authorization and
restriction of chemicals (REACH) as they enter into force
and is through product materials dec larations preparing for
the obligations to communicate information on substances
in the products.
Quality Statement
The products are designed and manufactured in an
industrial environment where quality systems and methods
like ISO 9000, Six Sigma, and SPC are inten sively in use to
boost the continuous improvements strateg y. Infant
mortality or early failures in the prod ucts are screened out
and they are subjected to an ATE-based final test.
Conservative design rules, design reviews and product
qualifications, plus the high competence of an engaged
work force, contribute to the high quality of the products.
Warranty
Warranty period and conditions are defined in Ericsson
Power Modules General Terms and Conditi ons of Sale.
Limitation of Liability
Ericsson Power Modules does not make any other
warranties, expressed or impli ed including any warranty of
merchantability or fitness for a particular purp ose (including,
but not limited to, use in life support applications, where
malfunctions of product can cause i njury to a person’s
health or life).
© Ericsson AB 2011
The information and specifications in this technical
specification is believed to be correct at the time of
publication. However, no liabil ity is accepted for
inaccuracies, printing errors or for any consequences
thereof. Ericsson AB reserves the right to change the
contents of this technical specification at any time without
prior notice.
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BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
2
Ericsson Internal
PRODUCT SPECIFICATION 3 (4)
Prepared (also subject responsible if other) No.
SEC/S Kevin Zhou 1/1301- BMR 453 0108
Approved Checked Date Rev Reference
SEC/S Kevin Zhou 2011-09-09 B
Safet
y
Specification
General information
Ericsson Power Modules DC/DC converters and DC/DC
regulators are designed in accordance with safety
standards IEC/EN/UL 60950-1 Safety of Information
Technology Equip m ent.
IEC/EN/UL 60950-1 contains requirements to prevent
injury or damage due to the following hazards:
• Electrical shock
• Energy hazards
• Fire
• Mechanical and heat hazards
• Radiation hazards
• Chemical hazards
On-board DC/DC converters and DC/DC regulators are
defined as component power supplies. As components
they cannot fully comply with the provisions of any safety
requirements without “Conditions of Acceptability”.
Clearance between conductors and between conductive
parts of the component power supply and conductors on
the board in the final product must meet the applicable
safety requirements. Certain conditions of acceptabilit y
apply for component po wer supplies with limited stand-off
(see Mechanical Information for further information). It is
the responsibility of the installer to ensure that the final
product housing these compo nents complies with the
requirements of all applicable safety standards and
regulations for the final product.
Component power supplies for general use should comply
with the requirements in IEC 60950-1, EN 60950-1 and
UL 60950-1 Safety of Information Technology Equipment.
There are other more product related standards, e.g.
IEEE 802.3 CSMA/CD (Ethernet) Access Method, and
ETS-300132-2 Power supply interface at the input to
telecommunications equi pment, operated by direct current
(dc), but all of these standards are based on
IEC/EN/UL 60950-1 with regards to safety.
Ericsson Power Modules DC/DC converters and DC/DC
regulators are UL 60950-1 recognized and certified in
accordance with EN 60950-1.
The flammability rating for all construction parts of the
products meet requirements for V-0 class material
according to IEC 60695-11-10, Fire hazard testing, test
flames – 50 W horizontal and vertical flame test methods.
The products should be installed in the end-use equipme nt,
in accordance with the requirements of the ultimate
application. Normally the output of the DC/DC converter is
considered as SELV (Safety Extra Low Voltage) and the
input source must be isolated by minimum Doub le or
Reinforced Insulation from the primar y circuit (AC mains) in
accordance with IEC/EN/UL 60950-1.
.
Isolated DC/DC converters
It is recommended that a slow blow fuse is to be used at
the input of each DC/DC converter. If an input filter is used
in the circuit the fuse should be placed in front of the input
filter.
In the rare event of a component problem that imposes a
short circuit on the input source, this fuse will provide the
following functions:
• Isolate the fault from the input power source so as
not to affect the operation of other parts of the
system.
• Protect the distribution wiring from excessive
current and power loss thus preventing hazardous
overheating.
The galvanic isolation is verifi ed in an electric strength test.
The test voltage (Viso) between input and output is
1500 Vdc or 2250 Vdc (refer to product specification).
24 V DC systems
The input voltage to the DC/DC converter is SELV (Safety
Extra Low Voltage) and the output remains SELV under
normal and abnormal operating conditions.
48 and 60 V DC systems
If the input voltage to the DC/DC converter i s 75 Vdc or
less, then the output remains SELV (Safety Extra Low
Voltage) under normal and a bnormal operating conditi ons.
Single fault testing in the input power supply circuit should
be performed with the DC/DC converter connecte d to
demonstrate that the input voltage does not exceed
75 Vdc.
If the input power source circuit is a DC power system, the
source may be treated as a TNV-2 circuit and testing has
demonstrated compliance with SELV limits in accordance
with IEC/EN/UL60950-1.
Non-isolated DC/DC regulators
The input voltage to the DC/DC regulator is SELV (Safety
Extra Low Voltage) and the output remains SELV under
normal and abnormal operating conditions.
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
3
Ericsson Confidential
PRODUCT SPECIFICATION 1 (5)
Prepared (also subject responsible if other) No.
ESHNMAA BMR 453 0208/014Uen
Approved Checked Date Rev Reference
2011-07-19 A L
Absolute Maximum Ratings
Characteristics min typ max Unit
TP1 Operating Temperature (see Thermal Consideration section) -40 +125 °C
TS Storage temperature -55 +125 °C
VI Input voltage -0.5 +80 V
Viso Isolation voltage (input to output test voltage) 1500 Vdc
Vtr Input voltage transient (Tp 100ms) 100 V
Positive logic option -0.3 18 V
VRC Remote Control pin voltage
(see Operating Information section) Negative logic option -0.3 18 V
V
Li
SALERT, CTRL, SYNC, SCL, SDA, SA(0,1) -0.3 3.6 V
Stress in excess of Absolute Maximum Ratings may cause permanent damage. Absolute Maximum Ratings, sometimes referred to as no destruction limits, are
normally tested with one parameter at a time exceeding the limits in the Electrical Specification. If exposed to stress above these limits, function and performance
may degrade in an unspecified manner.
Fundamental Circuit Diagram
-IN
+IN
+OUT
-OUT
Driver
Driver
Control
RC isolation
Auxillary
Supply
RC
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
4
Ericsson Confidential
PRODUCT SPECIFICATION 2 (5)
Prepared (also subject responsible if other) No.
ESHNMAA BMR 453 0208/014Uen
Approved Checked Date Rev Reference
2011-07-19 A L
Electrical Specification
12.45 V, 60 A / 711 W BMR 453 0208/014
TP1 = -40 to +90ºC, VI = 44 to 75 V, unless otherwise specified under Conditions.
Typical values given at: TP1 = +25°C, VI= 53 V, max IO, unless otherwise specified under Conditions.
Additional Cin = Cout = 220 µF. See Operating Information section for selection of capacitor types.
Characteristics Conditions min typ max Unit
VI Input voltage range 44 75 V
VIoff Turn-off input voltage Decreasing input voltage 32.9 34.1 35.0 V
VIon Turn-on input voltage Increasing input voltage 33.8 34.6 36.1 V
CI Internal input capacitance 35.2 μF
PO Output power 0 711 W
50% of max IO 96.7
max IO 95.8
50% of max IO, VI = 44 V 96.9
η Efficiency
max IO, VI = 44 V 95.8
%
Pd Power Dissipation max IO 31.2 W
Pli Input idling power IO = 0 A, VI = 53 V 4.8 W
PRC Input standby power VI = 53 V (turned off with RC) 0.32 W
fs Switching frequency 0-100 % of max IO 133 140 145 kHz
VOi Output voltage initial setting and
accuracy TP1 = +25°C, VI = 53 V, IO = 60 A 12.40 12.42 12.43 V
Output voltage tolerance band 0-100% of max IO 11.70 12.46 V
Idling voltage IO = 0 A 12.4 12.4 V
Line regulation max IO 20.0 21.0 mV
VO
Load regulation VI = 53 V, 1-100% of max IO 510.2 661.0 mV
Vtr Load transient
voltage deviation ±320 ±400 mV
ttr Load transient recovery time
VI = 53 V, Load step 25-75-25% of
max IO, di/dt = 1 A/μs
see Note 1 30 µs
tr Ramp-up time
(from 10−90% of VOi) 8.3 20.7 30.9 ms
ts Start-up time
(from VI connection to 90% of VOi)
10-100% of max IO
140.0 143.2 146.0 ms
tf VI shut-down fall time
(from VI off to 10% of VO) max IO 0.8 ms
RC start-up time max IO 55.3 ms
max IO 3.3 ms
tRC RC shut-down fall time
(from RC off to 10% of VO) IO = 0 A 7.3 s
IO Output current 0 60 A
Ilim Current limit threshold VO = 10.8 V 72.1 75 75 A
Isc Short circuit current TP1 = 25ºC, see Note 2 77.5 84.9 A
Cout Recommended Capacitive Load TP1 = 25ºC 0.2 6.6 12 µF
VOac Output ripple & noise, see Note3 See ripple & noise section, VOi 73.1 147.5 mVp-p
OVP Over voltage protection TP1 = +25°C, VI = 53 V, IO =1A 15.8 V
Sink current, see Note 4 See operating information 1.4 mA
RC Trigger level See operating information 1 V
Note 1: Co=6600uF OS-CON , 100uF ceramic capacitor
Note 2: Applying load until the output voltage lower than 0.5V
Note 3: Low ESR-value
Note 4: Sink current drawn by external device connected to the RC pin. Minimum sink current required to guarantee activated RC function.
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
5
Ericsson Confidential
PRODUCT SPECIFICATION 3 (5)
Prepared (also subject responsible if other) No.
ESHNMAA BMR 453 0208/014Uen
Approved Checked Date Rev Reference
2011-07-19 A L
Typical Characteristics
12.45 V, 60 A / 711 W BMR 453 0208/014
Efficiency Power Dissipation
90
91
92
93
94
95
96
97
98
0 5 10 15 20 25 30 35 40 45 50 55 60 65 [A]
[%]
44 V
53 V
75 V
0
6
12
18
24
30
36
0 102030405060 [A]
[W]
44 V
53 V
75 V
Efficiency vs. load current and input voltage at TP1 = +25°C. Dissipated power vs. load current and input voltage at
TP1 = +25°C.
Output Characteristics Current Limit Characteristics
11. 8 0
12 . 0 0
12 . 2 0
12 . 4 0
12 . 6 0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 [A ]
[V]
44 V
53 V
75 V
3.00
6.00
9.00
12.00
15.00
10 20 30 40 50 60 70 80 90 [A]
[V]
44 V
53 V
75 V
Output voltage vs. load current at TP1 = +25°C. Output voltage vs. load current at IO > max IO , TP1 = +25°C.
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
6
Ericsson Confidential
PRODUCT SPECIFICATION 4 (5)
Prepared (also subject responsible if other) No.
ESHNMAA BMR 453 0208/014Uen
Approved Checked Date Rev Reference
2011-07-19 A L
Typical Characteristics
12.45 V, 60 A / 711 W BMR 453 0208/014
Start-up Shut-down
Start-up enabled by connecting VI at:
TP1 = +25°C, VI = 53 V,
IO = 60 A resistive load.
Top trace: output voltage (10V/div.).
Bottom trace: input voltage (50 V/div.).
Time scale: (50 ms/div.).
Shut-down enabled by disconnecting VI at:
TP1 = +25°C, VI = 53 V,
IO = 60 A resistive load.
Top trace: output voltage (10 V/div.).
Bottom trace: input voltage (50 V/div.).
Time scale: (2 ms/div.).
Output Ripple & Noise Output Load Transient Res p onse
Output voltage ripple at:
TP1 = +25°C, VI = 53 V,
IO = 60 A resistive load.
Trace: output voltage (50 mV/div.).
Time scale: (10 µs/div.).
Output voltage response to load current step-
change (15-45-15 A) at:
TP1 =+25°C, VI = 53 V.
Top trace: output voltage (1 V/div.).
Bottom trace: load current (20 A/div.).
Time scale: (0.1 ms/div.).
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
7
Ericsson Confidential
PRODUCT SPECIFICATION 5 (5)
Prepared (also subject responsible if other) No.
ESHNMAA BMR 453 0208/014Uen
Approved Checked Date Rev Reference
2011-07-19 A L
Electrical Specification
12.45 V, 60 A / 711 W BMR 453 0208/014
Output Current Derating – Base plate Thermal Resistance – B ase plate
0
10
20
30
40
50
60
0 20 40 60 80 100 [°C]
[A]
3.0 m/s
2.0 m/s
1.5 m/s
1.0 m/s
0.5 m/s
Nat. Conv.
0.6
1.0
1.4
1.8
2.2
2.6
3.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0[m/s]
[°C/W]
Available load current vs. ambient air temperature and airflow at
VI = 48 V. See Thermal Consideration section.
Thermal resistance vs. airspeed measured at the converter. Tested
in wind tunnel with airflow and test conditions as per the Thermal
consideration section. VI = 48 V, Iout = 60 A.
Output Current Derating – Base plate with heat sink Thermal Resistance – Base plate with heat sink
0
10
20
30
40
50
60
0 20 40 60 80 100 [°C]
[A]
3.0 m/s
2.0 m/s
1.5 m/s
1.0 m/s
0.5 m/s
Nat. Conv.
0.5
0.8
1.1
1.4
1.7
2.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0[m/s]
[°C/W]
Available load current vs. ambient air temperature and airflow at
VI = 48 V. See Thermal Consideration section.
The type of heat sink is AAVID 241402B92200G
Thermal resistance vs. airspeed measured at the converter. Tested
in wind tunnel with airflow and test conditions as per the Thermal
consideration section. VI = 48 V, Iout = 60 A. The type of heat sink is
AAVID 241402B92200G
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
8
Ericsson Internal
PRODUCT SPECIFICATION 1 (6)
Prepared (also subject responsible if other) No.
SECSUND 30/1301-BMR 453 0208/014 Uen
Approved Checked Date Rev Reference
2011-09-09 B C
EMC Specification
Conducted EMI measured according to EN55022, CISPR 22
and FCC part 15J (see test set-up). See Design Note 009 for
detailed information. The fundamental switching frequency is
140KHz for BMR 453 at VI = 53 V, max IO.
Conducted EMI Input terminal value (typ)
EMI without filter
Optional external filter for class B
Suggested external input filter in order to meet class B in
EN 55022, CISPR 22 and FCC part 15J.
Filter components:
C1,2 = 2 μF
C3 = 220 μF
C4,5 = 2.2nF
L1,2=0.46mH @
100KHz
EMI with filter
Test set-up
Layout recommendations
The radiated EMI performance of the product will depend on
the PWB layout and ground layer design. It is also important to
consider the stand-off of the product. If a ground layer is used,
it should be connected to the output of the product and the
equipment ground or chassis.
A ground layer will increase the stray capacitance in the PWB
and improve the high frequency EMC performance.
Output ripple and noise
Output ripple and noise measured according to figure below.
See Design Note 022 for detailed information.
Output ripple and noise test setup
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
9
Ericsson Internal
PRODUCT SPECIFICATION 2 (6)
Prepared (also subject responsible if other) No.
SECSUND 30/1301-BMR 453 0208/014 Uen
Approved Checked Date Rev Reference
2011-09-09 B C
Operating information
Input Voltage
The input voltage range 45 to 53 Vdc meets the
requirements of the European Telecom Standard ETS 300
132-2 for normal input voltage range in –50.0 to -72 V
At input voltages exceeding 75 V, the power loss will be
higher than at normal input voltage and TP1 must be limited
to absolute max +125°C. The absolute maximum continuous
input voltage is 80 Vdc.
Turn-off Input Voltage
The product monitors the input voltage and will turn on and
turn off at predetermined levels.
The minimum hysteresis between turn on and turn off input
voltage is 1 V.
Remote Control (RC)
The product is fitted with a remote
control function referenced to the
primary negative input connection
(-In). The RC function allows the
product to be turned on/off by an
external device like a
semiconductor or mechanical
switch. The RC pin has an internal
pull up resistor to internal voltage
reference 18V.
The external device must provide a minimum required sink
current to guarantee a maximum voltage on the RC pin (see
Electrical characteristics table)
The standard product is provided with “negative logic” RC
and will be off until the RC pin is connected to the -In. To
turn off the product the RC pin should be left open, or
connected to a voltage higher than 13 V referenced to -In. In
situations where it is desired to have the product to power up
automatically without the need for control signals or a switch,
the RC pin can be wired directly to -In.
Input and Output Impedance
The impedance of both the input source and the load will
interact with the impedance of the product. It is important
that the input source has low characteristic impedance. The
products are designed for stable operation without external
capacitors connected to the input or output. The
performance in some applications can be enhanced by
addition of external capacitance as described under External
Decoupling Capacitors. If the input voltage source contains
significant inductance, the addition of a 22 - 100 µF
capacitor across the input of the product will ensure stable
operation. The capacitor is not required when powering the
product from an input source with an inductance below
10 µH. The minimum required capacitance value depends
on the output power and the input voltage. The higher output
power the higher input capacitance is needed.
External Decoupling Capacitors
When powering loads with significant dynamic current
requirements, the voltage regulation at the point of load can
be improved by addition of decoupling capacitors at the load.
The most effective technique is to locate low ESR ceramic
and electrolytic capacitors as close to the load as possible,
using several parallel capacitors to lower the effective ESR.
The ceramic capacitors will handle high-frequency dynamic
load changes while the electrolytic capacitors are used to
handle low frequency dynamic load changes. Ceramic
capacitors will also reduce any high frequency noise at the
load. It is equally important to use low resistance and low
inductance PWB layouts and cabling.
External decoupling capacitors will become part of the
product’s control loop. The control loop is optimized for a
wide range of external capacitance and the maximum
recommended value that could be used without any
additional analysis is found in the Electrical specification.
The ESR of the capacitors is a very important parameter.
Stable operation is guaranteed with a verified ESR value of
>10 mΩ across the output connections.
For further information please contact your local Ericsson
Power Modules representative.
Soft-start Power Up
The soft-start control introduces a time-delay (default setting
40 ms) before allowing the output voltage to rise. The default
rise time of the ramp up is 10 ms. Power-up is hence
completed within 50 ms in default configuration using remote
control. When starting by applying input voltage the control
circuit boot-up time adds an additional 140 ms delay.
Temperature Protection (OTP)
The product is protected from thermal overload by an
internal temperature shutdown protection.
When TP1 as defined in thermal consideration section is
exceeded the product will shut down. The product will make
continuous attempts to start up (non-latching mode) and
resume normal operation automatically when the
temperature has dropped below the temperature threshold.
The hysteresis is defined in general electrical specification.
Note: the fault response “continue without interruption” may
cause permanent damage of the product.
Over Voltage Protection (OVP)
The product has output over voltage protection that will shut
down the product in over voltage conditions.
Over Current Protection (OCP)
The product includes current limiting circuitry for protection
at continuous overload. The output voltage will decrease
towards zero for output currents in excess of max output
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
10
Ericsson Internal
PRODUCT SPECIFICATION 3 (6)
Prepared (also subject responsible if other) No.
SECSUND 30/1301-BMR 453 0208/014 Uen
Approved Checked Date Rev Reference
2011-09-09 B C
current (max IO). The product will resume normal operation
after removal of the overload. The load distribution should be
designed for the maximum output short circuit current
specified.
Fault protection recovery
If one of the two modules exceeds the OVP, OCP or OTP
level, the module might turn off depends on its pre-set fault
response action, and the other module might not handle
more current than its max capability, that will lead to both
modules can not recover until the protection trig condition
removed, to secure a normal operation, both modules need
a reset after the fault condition removed.
Pre-bias Start-up
The product has a Pre-bias start up functionality and will not
sink current during start up if a pre-bias source is present at
the output terminals.
Input Transient
The products have limited ability to react on sudden
input voltage changes. The module can have an output
voltage deviation of 2 V when input step is applied (45 V to
53 V). This is tested with a slew rate of 0.1 V/us on the input
voltage change and minimum output capacitance 100 uF.
Increasing the output capacitance will improve the result.
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
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Ericsson Internal
PRODUCT SPECIFICATION 4 (6)
Prepared (also subject responsible if other) No.
SECSUND 30/1301-BMR 453 0208/014 Uen
Approved Checked Date Rev Reference
2011-09-09 B C
Thermal Consideration
General
The product is designed to operate in different thermal
environments and sufficient cooling must be provided to
ensure reliable operation.
For products mounted on a PWB without a heat sink attached,
cooling is achieved mainly by conduction, from the pins to the
host board, and convection, which is dependant on the airflow
across the product. Increased airflow enhances the cooling of
the product. 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 VI =53V.
The product is tested on a 254 x 254 mm, 35 µm (1 oz),
16-layer test board mounted vertically in a wind tunnel with a
cross-section of 608 x 203 mm.
Definition of product operating temperature under
forced air colling
The product operating temperature is used to monitor the
temperature of the product, and proper thermal conditions
can be verified by measuring the temperature at positions
(P1, P2, P3 and P4). The temperature at these positions
(TP1, TP2, TP3, TP4) should not exceed the maximum
temperatures in the table below. The number of
measurement points may vary with different thermal design
and topology. Temperatures above maximum TP1, measured
at the reference point P1 are not allowed and may cause
permanent damage.
Position Description Max Temp.
P1 Upper PCB (close to baseplate)
bottom side (away from base plate)
TP1=125º C
P2 Upper PCB Optical coupler TP2=110º C
P3 Lower PCB control IC TP3=120º C
P4 Base plate TP4=120º C
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. 95% = 0.95
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 b e significantly reduced if a
heat sink is mounted on the top of the base plate.
Calculate the temperature increase (ΔT).
ΔT = Rth x Pd
3. Max allowed ambient temperature is:
Max TP1 - ΔT.
E.g. BMR 453 5100/001 at 2 m/s:
1. (( ) - 1) × 396 W = 23.5 W
2. 23.5 W × 3.1°C/W = 73°C
3. 125 °C – 73°C = max ambient temperature is 52°C
The actual temperature will be dependent on several factors
such as the PWB size, number of layers and direction of
airflow.
1
0.944
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BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
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Ericsson Internal
PRODUCT SPECIFICATION 5 (6)
Prepared (also subject responsible if other) No.
SECSUND 30/1301-BMR 453 0208/014 Uen
Approved Checked Date Rev Reference
2011-09-09 B C
Connections (Top vi ew)
Pin Designation Function
1 +In Positive input
2 RC Remote control
3 Case Connection to case(Optional;
see Ground Pin ordering
option)
4 -In Negative input
5 -Out Negative output
6 +Out Positive output
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
13
Ericsson Internal
PRODUCT SPEC. MECHANICAL 6 (7)
Prepared (also subject responsible if other) No.
EPETSCH/EPEHLI/EPEIHLI 4/1301 BMR 453 Uen
Approved Checked Date Rev Reference
SEC/D [Julia You] See §1 2011-06-15 G
Mechanical Information – Hole mount – Stacker-Base plate GND version (24.5mm)
All component placements – whether shown as physical components or symbolical outline – are for reference only and are subject to change throughout the product’s life cycle,
unless explicitly described and dimensioned in this drawing.
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
14
Ericsson Internal
PRODUCT SPEC. 1 (3)
Prepared (also subject responsible if other) No.
EPETSCH/EPEIHLI 5/1301 BMR 453 Uen
Approved Checked Date Rev Reference
SEC/D [Julia You] See §1 2011-06-23 E
Soldering Information – Hole Mounting
The hole mounted product is intended for plated through hole
mounting by wave or manual soldering. The pin temperature is
specified to maximum to 270°C for maximum 10 seconds.
A maximum preheat rate of 4°C/s and maximum preheat temperature
of 150°C is suggested. When soldering by hand, care should be taken
to avoid direct contact between the hot soldering iron tip and the pins
for more than a few seconds in order to prevent overheating.
A no-clean flux is recommended to avoid entrapment of cleaning fluids
in cavities inside the product or between the product and the host
board. The cleaning residues may affect long time reliability and
isolation voltage.
Delivery Package Information – Hole Mount Version
The products are delivered in antistatic trays.
Tray Specifications
Material PE Foam
Surface resistance 105 < Ohm/square < 1012
Bakability The trays are not bakeable
Tray capacity 20 converters/tray
Box capacity 20 products (1 full tray/box)
Weight Product – Stacker option
2460 g full tray, 260 g empty tray
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
15
Ericsson Internal
PRODUCT SPEC. 2 (3)
Prepared (also subject responsible if other) No.
EPETSCH/EPEIHLI 5/1301 BMR 453 Uen
Approved Checked Date Rev Reference
SEC/D [Julia You] See §1 2011-06-23 E
Product Qualification Specification
Characteristics
External visual inspection IPC-A-610
Change of temperature
(Temperature cycling) IEC 60068-2-14 Na Temperature range
Number of cycles
Dwell/transfer time
-40 to 100°C
1000
15 min/0-1 min
Cold (in operation) IEC 60068-2-1 Ad Temperature TA
Duration -45°C
72 h
Damp heat IEC 60068-2-67 Cy Temperature
Humidity
Duration
85°C
85 % RH
1000 hours
Dry heat IEC 60068-2-2 Bd Temperature
Duration 125°C
1000 h
Electrostatic discharge
susceptibility IEC 61340-3-1, JESD 22-A114
IEC 61340-3-2, JESD 22-A115 Human body model (HBM)
Machine Model (MM) Class 2, 2000 V
Class 3, 200 V
Immersion in cleaning solvents IEC 60068-2-45 XA, method 2 Water
Glycol ether
Isopropyl alcohol
55°C
35°C
35°C
Mechanical shock IEC 60068-2-27 Ea Peak acceleration
Duration 100 g
6 ms
Moisture reflow sensitivity 1 J-STD-020C Level 1 (SnPb-eutectic)
Level 3 (Pb Free) 225°C
260°C
Operational life test MIL-STD-202G, method 108A Duration 1000 h
Resistance to soldering heat 2 IEC 60068-2-20 Tb, method 1A Solder temperature
Duration 270°C
10-13 s
Robustness of terminations IEC 60068-2-21 Test Ua1
IEC 60068-2-21 Test Ue1 Through hole mount products
Surface mount products All leads
All leads
Solderability
IEC 60068-2-58 test Td 1
IEC 60068-2-20 test Ta 2
Preconditioning
Temperature, SnPb Eutectic
Temperature, Pb-free
Preconditioning
Temperature, SnPb Eutectic
Temperature, Pb-free
150°C dry bake 16 h
215°C
235°C
Steam ageing
235°C
245°C
Vibration, broad band random IEC 60068-2-64 Fh, method 1 Frequency
Spectral density
Duration
10 to 500 Hz
0.07 g2/Hz
10 min in each direction
Notes
1 Only for products intended for reflow soldering (surface mount products)
2 Only for products intended for wave soldering (plated through hole products)
E
BMR 453 PI series Intermediate Bus Converters
Input 44-75 V, Output up to 60 A / 711 W
EN/LZT 146 444 R1C September 2011
© Ericsson AB
Technical Specification
16
