LSM-EB Datasheet, PDF (4/5 Pages) Murata Manufacturing Co., Ltd. – 10 Amp DC/DC Power Converter Evaluation Boards

LSM-EB Series
10 Amp DC/DC Power Converter Evaluation Boards
Distributed Bus Architecture
The LSM series DC/DC converters are an ideal solution for modern interme-
diate bus architecture (IBA) or distributed bus architecture (DBA) applications
used in telecommuncations and dedicated stand-alone systems. DBA's see
implementation whenever multiple final power voltages are required (each
using a dedicated single-voltage DC/DC converter) while retaining overall
system power isolation.
DBA's position the final DC/DC right at the load (also called Point of Load,
POL converters). This provides the best possible dynamic response, regu-
lation, and noise reduction. It also distributes the thermal load to avoid
system hotspots or concentrations of high switching currents. Since the POL
DC/DC's are non-isolated models, their physical size is reduced, making
them ideal for tape and reel automated surface mounting.
A single system-wide master high power bus converter performs the initial
power voltage conversion. A 48Vdc input is typical with 12Vdc outputs distrib-
uted to several POL DC/DC's. DBA's also retain very high system efficiency,
important for battery operated and standby applications.
In the diagram below, a DATEL model SBC-12/22-L48 acts as the bus
converter from system 48 Volts to 12 Volts distributed to each POL converter.
One POL converter powers 3.3V system logic while a separate 1.2V POL
converter runs the CPU. A third 5V POL converter powers legacy I/O ports.
Notice that the 12V power leads are routed all the way back to the the bus
converter for best performance. Also observe that only one source of isolation
is required (in the bus converter) so that individual POL converters can be
lower cost non-isolated versions.
The Distributed Bus Architecture offers a lower overall system cost than using
separate bulkier isolated converters at each voltage load. And it prevents
possible crosstalk of high power digital switching signals. A final advantage
of DBA's is that the designer has a choice of where and how to interconnect
system grounds and is not restricted by a noisy system "mecca" ground.
48VDC
INPUT
POWER
(TYPICAL)
DATEL
SBC-12/22-L48
BUS CONVERTER
12VDC
SYSTEM
ISOLATION
BARRIER
POINT-OF-LOAD
DC/DC CONVERTERS
LSM-5/10-D12
5VDC
I/O PORTS
LSM-3.3/10-D12 3.3VDC
SYSTEM
LOGIC
LOCAL GROUNDS
AS APPROPRIATE
LSM-1.2/10-D12 1.2VDC
CPU
Figure 2. Distributed Bus Architecture
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