Ericsson Internal
E
EMAOLII
PRODUCT SPECIFICATION
3 (8)
Prepared (also subject responsible if other)
No.
30/1301-BMR 456 Uen
35
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
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.
Please contact your local Ericsson Power Modules
representative for appropriate SW tools to down-load new
configurations.
Output Voltage Adjust using PMBus
The output voltage of the product can be reconfigured using
the PMBus interface.
Margin Up/Down Controls
These controls allow the output voltage to be momentarily
adjusted, either up or down, by a nominal 10%. This provides
a convenient method for dynamically testing the operation of
the load circuit over its supply margin or range. It can also be
used to verify the function of supply voltage supervisors.
The margin up and down levels of the product can be re-
configured using the PMBus interface.
For further information please contact your local Ericsson
Power Modules representative.
Parallel Operation (Droop Load Share, DLS)
The BMR456, DLS products, (product-number ending /013,
/014, /016 or /017) are variants that can be connected in
parallel. The products have a pre-configured voltage droop:
The stated output voltage set point is at no load. The output
voltage will decrease when the load current is increased. The
voltage will droop 0.6 V while load reaches max load. This
feature allows the products to be connected in parallel and
share the current with 10% accuracy. Up to 90% of max
output current can be used from each product.
Soft-start Power Up
The default rise time of the ramp up is 10 ms. When starting
by applying input voltage the control circuit boot-up time adds
an additional 15 ms delay. The soft-start power up of the
product can be reconfigured using the PMBus interface.
The DLS variants have a pre-configured ramp up time of
25 ms.
When running DLS-products in parallel command (0xF9) must
be set according to MFR_MULTI_PIN_CONFIG. To prevent
unnecessary current stress, changes of the output voltage
must be done with the output disabled. This must be
Remote Sense
The product has remote sense that can be used to
compensate for voltage drops between the output and the
point of load. The sense traces should be located close to the
PWB ground layer to reduce noise susceptibility. The remote
sense circuitry will compensate for up to 10% voltage drop
between output pins and the point of load. If the remote sense
is not needed +Sense should be connected to +Out and
-Sense should be connected to -Out. To be able to use remote
sense the converter must be equipped with a Communication
interface.
considered for all commands that affect the output voltage.
Voltage regulation DLS products
12.8
Module 1
Module 2
12.6
Module 1+2
12.4
12.2
12.0
11.8
11.6
Temperature Protection (OTP, UTP)
The products are 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 set in the
command OT_WARN_LIMIT (0x51); the hysteresis is defined
in general electrical specification.
The OTP and hysteresis of the product can be re-configured
using the PMBus interface. The product has also an under
temperature protection. The OTP and UTP fault limit and fault
response can be configured via the PMBus. Note: using the
fault response “continue without interruption” may cause
permanent damage to the product
0
10
20
30
40
50
60
70
Output Current [A]
Feed Forward Capability
The BMR456 products have a feed forward function
implemented that can handle sudden input voltage changes.
The output voltage will be regulated during an input transient
and will typically stay within 10% when an input transient is
applied.
PMBus configuration and support
Over Voltage Protection (OVP)
The product provides a PMBus digital interface that enables
the user to configure many aspects of the device operation as
well as monitor the input and output parameters.
The product includes over voltage limiting circuitry for
protection of the load. The default OVP limit is 30% above the
nominal output voltage. If the output voltage exceeds the OVP
ERICSSON [ ERICSSON ]
