Ericsson Internal
E
EMAOLII
PRODUCT SPECIFICATION
4 (8)
Prepared (also subject responsible if other)
No.
30/1301-BMR 456 Uen
36
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
limit, the product can respond in different ways.
The default response from an over voltage fault is to
immediately shut down. The device will continuously check for
the presence of the fault condition, and when the fault
condition no longer exists the device will be re-enabled.
The OVP fault level and fault response can be re-configured
using the PMBus interface.
use Push-pull when paralleling PG-pins, see
MFR_MULTI_PIN_CONFIG.
Synchronization, Tracking and External reference
This product does not support synchronization, tracking or
external reference.
Switching frequency adjust using PMBus
Over Current Protection (OCP)
The switching frequency is set to 140 kHz as default but this
can be reconfigured via the PMBus interface. The product is
optimized at this frequency but can run at lower and higher
frequency, (125-150 kHz). The electrical performance can be
affected if the switching frequency is changed.
The product includes current limiting circuitry for protection at
continuous overload. The default setting for the product is hic-
up mode if the maximum output current is exceeded and the
output voltage is below 0.3×Vout, set in command
IOUT_OC_LV_FAULT_LIMIT (0x48). Above the trip voltage
value in command 0x48 the product will continue operate
while maintaining the output current at the value set by
IOUT_OC_FAULT_LIMIT (0x46). The load distribution should
be designed for the maximum output short circuit current
specified.
MFR_MULTI_PIN_CONFIG
The MFR_MULTI_PIN_CONFIG (0xF9) command enables or
disables different functions inside the product. This command
can be configured according to the table for different functions.
Bit 7:6
Droop Load Share variants (DLS) will enter hic-up mode, with
a trip voltage, 0.04×Vout, set in command
IOUT_OC_LV_FAULT_LIMIT (0x48). Above the trip voltage in
command (0x48) the product will continue operate while
maintaining the output current at the value set by
IOUT_OC_FAULT_LIMIT (0x46).
00 = Stand alone
01 = Slave (N/A)
10 = DLS
1
1
1
1
1
1
0
0
0
0
0
0
11 = Master (N/A)
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
1
0
1
Bit 5
Power Good High Z
when active
Bit 4
Tracking enable
(N/A)
Bit 3
External reference
(N/A)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
The over current protection of the product can be reconfigured
using the PMBus interface.
Bit 2
Power Good
Enable
Input Over/Under voltage protection
0
1
0
1
1
1
1
1
1
1
1
1
0
0
0
0
1
0
1
0
1
0
1
0
The input of the product can be protected from high input
voltage and low input voltage. The over/under-voltage fault
level and fault response can be configured via the PMBus
interface.
Bit 1
Reserved
Bit 0
Secondary Remote
Control Pull
up/down resistor
enable 1)
0
1
0
1
0
1
0
1
0
1
0
1
Pre-bias Start-up Capability
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. If the Pre-bias voltage is lower than the
target value set in VOUT_COMMAND (0x21), the product will
ramp up to the target value. If the Pre-bias voltage is higher
than the target value set in VOUT_COMMAND (0x21), the
product will ramp down to the target value and in this case
sink current for a limited of time set in the command
TOFF_MAX_WARN_LIMIT (0x66).
1) When not used
with PMBus, the
CTRL input can be
internally pulled up
or down depending
on if it is active high
or low. When active
low it will be pulled
up and vice versa
The MFR_MULTI_PIN_CONFIG can be reconfigured using
the PMBus interface. Default configuration is set to Power
Good Push-Pull (0x04) for stand alone variants and DLS
Power Good
The product provides Power Good (PG) flag in the Status
Word register that indicates the output voltage is within a
specified tolerance of its target level and no fault condition
exists. If specified in section Connections, the product also
provides a PG signal output. The Power Good signal is by
default configured as active low, Push-pull and can be re-
configured via the PMBus interface. The Power Good output
can be configured as Push-pull or “High Z when active” to
permit AND’ing of parallel devices. It is not recommended to
Power Good Push-Pull (0x86) for Droop Load Share variants.
User customized settings
This product has two data storage set: Default data (Ericsson
factory) and User data. The User data set’s priority is higher
than the Default data. The User data area is empty while
shipped to customer. After boot-up, if the controller found no
data stored in User data area, it will load Default data instead.
ERICSSON [ ERICSSON ]
