Ericsson Internal
E
SECSUND
PRODUCT SPECIFICATION
5 (7)
Prepared (also subject responsible if other)
No.
30/1301-BMR 451 0002 Uen
16
Technical Specification
Approved
Checked
Date
Rev
Reference
EN/LZT 146 401 R4A May 2015
BMR 451 Digital PoL Regulators
Input 4.5-14 V, Output up to 40 A / 132 W
2015-05-15
PJ1
© Ericsson AB
Power Management Overview
Thermal Consideration
The product incorporates a wide range of monitorable 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, and internal temperature. If the monitoring is
not needed it can be disabled and the module enters a low
power mode reducing the power consumption. The protection
features are not affected.
General
The regulators 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 regulator.
Increased airflow enhances the cooling of the regulator.
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 specified VI.
All power management functions can be configured via the
PMBus interface. Monitoring parameters can be pre-
configured to provide alerts for specific conditions. Please
contact your local Ericsson Power Modules representative for
design support of custom configurations or appropriate SW
tools for design and down-load of new configurations.
The products with an output power of ≥100 W are tested on a
254 x 254 mm, 35 µm (1 oz), 16-layer test board, and for
output power of <100 W a 254 x 254 mm, 35 µm (1 oz), 8-
layer test board are used. The test board is mounted vertically
in a wind tunnel with a cross-section of 608 x 203 mm.
Proper cooling of the product can be verified by measuring the
temperature at position P1. The temperature at this position
should not exceed the max values provided in the table below.
The number of points may vary with different thermal design
and topology.
Efficiency Optimized Dead Time Control
The regulator utilizes a closed loop algorithm to optimize the
dead-time applied between the gate drive signals for the
switch and synch FETs. The algorithm constantly adjusts the
deadtime non-overlap to minimize the duty cycle, thus
maximizing efficiency. This algorithm will null out deadtime
differences due to component variation, temperature and
loading effects. The algorithm can be configured via the
PMBus. Please contact your local Ericsson Power Modules
representative for design support of custom configurations or
appropriate SW tools for design and down-load of new
configurations.
Note that the max value is the absolute maximum rating
(non destruction) and that the electrical Output data is
guaranteed up to TP1 equal to 85 degrees.
See Design Note 019 for further information.
Position Device
Designation
Max value
120º C
P1
L1
TP1
P1
Air
flow
Bottom view
Top view
Temperature positions and air flow direction.
Definition of Reference Temperature TP1
The reference temperature is used to monitor the temperature
limits of the product. Temperature above maximum TP1
,
meassured at the reference point P1 are not allowed and may
cause degradation or permanent damage to the product. TP1 is
also used to define the temperature range for normal operating
conditions. TP1 is defined by the design and used to guarantee
safety margins, proper operation and high reliability ot the
product.
ERICSSON [ ERICSSON ]
