Ericsson Internal
E
EMAOLII
PRODUCT SPECIFICATION
2 (8)
Prepared (also subject responsible if other)
No.
30/1301-BMR 456 Uen
34
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
internal pull up resistor. The remote control functions can also
be configured using the PMBus
Operating information
Power Management Overview
The device should be capable of
sinking 0.7 mA. When the RC pin is
left open, the voltage generated on
the RC pin is max 6 V. The standard
product is provided with “negative
logic” remote control and will be off
until the RC pin is connected to the
-In. To turn on the product the voltage
between RC pin and -In should be
less than 1 V.
This product is equipped with a PMBus interface. The product
incorporates a wide range of readable and configurable power
management features that are simple to implement
with a minimum of external components. Additionally, the
product includes protection features that continuously
safeguard the load from damage due to unexpected system
faults. A fault is also shown as an alert on the SALERT pin.
The following product parameters can continuously be
monitored by a host: Input voltage, output voltage/current,
duty cycle and internal temperature.
To turn off the product the RC pin should be left open for a
minimum of time 150 µs, the same time requirement applies
when the product shall turn on. 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 or disabled via the 0xE3 command. The logic
option for the primary remote control is configured via 0xE3
command using the PMBus.
The product is delivered with a default configuration suitable
for a wide range operation in terms of input voltage, output
voltage, and load. The configuration is stored in an internal
Non-Volatile Memory (NVM). All power management functions
can be reconfigured using the PMBus interface. Please
contact your local Ericsson Power Modules representative for
design support of custom configurations or appropriate SW
tools for design and down-load of your own configurations.
Remote Control (secondary side)
Input Voltage
The CTRL-pin can be configured as remote control via the
PMBus interface. In the default configuration the CTRL-pin is
disabled and floating. The output can be configured to internal
pull-up to 3.3 V using the MFR_MULTI_PIN_CONFIG (0xF9)
PMBus command. The CTRL-pin can be left open when not
used. The logic options for the secondary remote control can
be positive or negative logic. The logic option for the
secondary remote control is configured via ON_OFF_CONFIG
(0x02) command using the PMBus interface, see also
MFR_MULTI_PIN_CONFIG section.
The BMR456 consists of two different product families
designed for two different input voltage ranges, 36 to 75 Vdc
and 40 to 60 Vdc, see ordering information.
The input voltage range 36 to 75 Vdc meets the requirements
of the European Telecom Standard ETS 300 132-2 for normal
input voltage range in –48 and –60 Vdc systems, -40.5 to
-57.0 V and –50.0 to -72 V respectively.
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.
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. Minimum
recommended external input capacitance is 100 µF. The
electrolytic capacitors will be degraded in low temperature.
The input capacitance in low temperature should be
equivalent to 100 µF in 20degree. The performance in some
applications can be enhanced by addition of external
capacitance as described under External Decoupling
Capacitors.
The input voltage range 40 to 60 Vdc meets the requirements
for normal input voltage range in -48 V systems, -40.5 to
-57.0 V. At input voltages exceeding 60 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 65 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 2 V. The turn on
and turn off levels of the product can be reconfigured using
the PMBus interface
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
Remote Control (RC)
The products are fitted with a configurable remote control
function. The primary remote control is referenced to the
primary negative input connection (-In). The RC function
allows the converter to be turned on/off by an external device
like a semiconductor or mechanical switch. The RC pin has an
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