LSM-EB Series
10 Amp DC/DC Power Converter Evaluation Boards
Features
Rapid evaluation of DATEL LSM series
10 Amp DC/DC converters
Twenty-four models ranging from 0.8V
to 5V single outputs at 10 Amps max.
Ideal for mixed logic families.
For CPU, logic array and custom
controller applications
Avoids initial user development of
SMT mounting systems while offering
realistic evaluation of a surface-mounted
converter
Rugged banana jack I/O connections
plus input Pi L-C filter
Provision for external shut-down control
inputs and trim circuit evaluation
Includes test points for oscilloscope
evaluation of performance
Designed to ease the evaluation of today's subminiature surface-mount technol-
ogy (SMT) 10 Amp single output DC/DC power converters, DATEL's LSM-EB
series includes twenty four models for all popular logic family output voltages and
common input power voltages. Each LSM-EB model consists of a 4.31-inch square
circuit board including a DATEL LSM-series surface mounted DC/DC converter,
input/output banana jacks, trim circuits and various passive components.
Rather than hand wiring to small mounting pads, the user can more accurately
test real world electrical and thermal performance on a mounting board with a full
ground plane and input Pi filter. The circuit board is mounted on four removable
one-inch standoffs threaded for 4-40 screw attachment.
The heart of the LSM-EB evaluation board is DATEL's advanced single output
non-isolated LSM series DC/DC converter. Running from either 3.3 Volt, 5 Volt or
12 Volt DC input power, the LSM series provides high quality point-of-load (POL)
output power for CPU's, memory systems, microcontrollers and large array logic.
See DATEL's LSM Series data sheet for full information.
J1
+V
IN
L1
1μH
+
C5
33μF
+
C4
33μF
C2
22μF
+
TRIM
ON/OFF
CONTROL
1
–V
IN
J2
PIN 2
J1 THRU J4
ARE BANANA JACKS
1
ON/OFF CONTROL
2
TRIM DOWN
3
4
2
+V
IN
+V
OUT
+SENSE
6
+
5
J3
+V
OUT
GND
3
C1
22μF
–V
OUT
J4
PIN 3
R3
R4
TRIM UP
DIP SWITCH, SW1
CLOSED
OPEN
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email: sales@murata-ps.com, tel:
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MDC_LSM_EB.B01
Page 1 of 5
LSM-EB Series
10 Amp DC/DC Power Converter Evaluation Boards
Specification Summary
DC/DC Converter type
Input Voltage
Output Voltage
Output Current
Minimum load
Input and Output Terminals
banana jacks (4 locations)
Outline Dimensions
Height above board
Standoffs
Fabrication
Operating Temp. Range
(Ambient, natural convection)
DATEL LSM series
3.3, 5 or 12 Volts (see Ordering Guide)
0.8 to 5 Volts, (see Ordering Guide)
10 Amps, max.
Zero (no minimum load)
0.166-inch (4.22mm) removable
4.31" x 4.31" x 1.5" max. (including standoffs)
0.41"
Four removable, 1.0" length, 4-40 threaded
Multi-layer printed circuit board
–40 to +65/+71°C
Diagnostic Test Points
Four pins are provided for a combination of measurements. Pins 1 and 2
sense the voltage immediately at the DC/DC inputs. Pins 3 and 4 display the
output voltage. Connect these pins either to an oscilloscope or voltmeter.
If preferred, the input inductor may be bypassed by shorting J1 to Pin 1.
Input Current Measurement
A current sense resistor (not supplied) may be conveniently installed across
the input inductor from J1 to Pin 1 after removing inductor L1 with a
surface mount hot air desoldering tool. Suggested resistor values are 2 to 5
milliohms. These values will not degrade operation of the DC/DC converter
yet will develop sufficient voltage at full power for measurement by a digital
voltmeter or oscilloscope.
Note that the 'scope must be connected in differential mode. If preferred,
a sense resistor can also be installed in series with either ground jack
without having to remove L1. A sense resistor of several milliohms may be
conveniently fabricated with several inches of 12 or 14 gauge wire.
Digital On/Off Control
See DATEL's LSM series data sheet for full information on the DC/DC converter.
Maximum operating temperature ranges are dependent on model type. See the LSM series
converter data sheet. Temperature range may be extended with forced cooling.
The standoffs are not connected to the board ground plane. Use a discrete connection if you
wish to ground the standoffs.
Component Locations
The board is laid out with filter capacitors and the inductor on the input and
a filter capacitor on the output. These represent typical values that you would
normally use in your application therefore, performance should be similar.
Also, the values comply with those recommended in the LSM data sheet.
The two trim resistor locations (R3 and R4) are left open for the user to install
suitable trim resistors, either as axial lead resistors or "0805" surface mount
resistors. White silkscreening on the board identifies all components.
Usage Guidelines
Refer to the LSM series data sheet for full details on the following topics.
Input/Output Connections
Holding the module upright, input power is applied to the left set of banana
jacks. Output power is extracted from the right banana jacks. Please note
that both ground terminals on the bottom are connected together internally.
To retain high system performance, be sure to use the proper gauge wiring
(12 gauge or larger is recommended). The hex standoffs are not connected
to the ground plane.
Use as short wiring as possible. For longer power wiring, to prevent noise
radiation, consider either twisting the leads and/or enclosing the leads in a
grounded copper shield.
Input Pi Filter
A classic Pi filter is provided on the converter's input. While this filter
is not required if you can assure that the input voltage at the DC/DC
terminals remains within the input voltage range at all times and is reason-
ably low noise, many applications will see improved performance if the filter
is employed. The filter is also useful for switching output loads and for
evaluation of input ripple current. The inductor and associated capacitors are
selected to prevent saturation and excessive power dissipation at the full 10
Amp output current while avoiding inductive spike damage to the DC/DC. The
capacitors are chosen for low ESR.
The top section (SW1-A) of the 3-pole DIP switch enables the power output
of the converter. You may either do this manually with the rocker switch or
connect an external logic gate to the pole nearest the output terminals on
the back side of the board. Such an external gate should be referenced to the
converter's power ground and use 5V TTL/LS logic.
A small reed relay or an open collector NPN transistor or FET may also be
used to control the DC/DC with the collector tied to the same control terminal
pole on the DIP switch. The converter's on/off control includes an internal
pullup resistor to +5V. The pullup is 5 to 14 kilohms, depending on model.
Leave the on-board DIP switch open if you use any of these external controls.
Use short leads if you install an external control.
If the on/off control is left open, the converter will operate normally. Always
make sure the DC/DC is powered up before activating the on/off control.
Trim Circuits
The bottom two sections of the 3-pole DIP switch connects the converter's
single trim input to two external resistor positions immediately to the right of
the switch body. See the schematic diagram. The upper resistor corresponds
to the leg connecting to the +V
OUT
terminal and the bottom resistor connects
to –V
OUT
. The switches allow you to temporarily disconnect the trim resistors
to evaluate their effects.
You may either install discrete resistors in these two through-hole or surface
mount locations or you may wire a closely-mounted 20 kilohm potentiometer
between the board pads. Use short leads to prevent noise pickup and
instability. Study the LSM data sheet for the required resistor values.
Thermal Considerations
The DC/DC converter, when mounted on the evaluation board, is rated up
to approximately +65 degrees Centrigrade operation (depending on model)
using natural convection at low or moderate altitude. The converter is pro-
tected by thermal shutdown if overcurrent, higher altitude and/or overtemper-
ature operation is attempted. Some heat is extracted through the mounting
pads. Higher temperature operation is available with forced cooling. Carefully
study the derating curves on the LSM data sheet.
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
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MDC_LSM_EB.B01
Page 2 of 5
LSM-EB Series
10 Amp DC/DC Power Converter Evaluation Boards
4.31 (109.47)
3.94 (100.08)
A
A
1.5 MAX.
(38.1)
1.0
(25.4)
(4) HEX
STANDOFFS
4-40 THREAD
3.94
(100.08)
4.31
(109.47)
TOP VIEW
DIMENSIONS ARE IN INCHES (MM)
B
B
I/O Connections
Terminal
J1
J2
J3
J4
Pin 1
Pin 2
Pin 3
Pin 4
Function
+V
IN
external
–V
IN
external
+V
OUT
external
–V
OUT
external
DC/DC +V
IN
DC/DC –V
IN
DC/DC –V
OUT
DC/DC +V
OUT
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Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
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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.
POINT-OF-LOAD
DC/DC CONVERTERS
LSM-5/10-D12
DATEL
SBC-12/22-L48
BUS CONVERTER
5VDC
I/O PORTS
48VDC
INPUT
POWER
(TYPICAL)
12VDC
LSM-3.3/10-D12
3.3VDC
SYSTEM
LOGIC
LOCAL GROUNDS
AS APPROPRIATE
SYSTEM
ISOLATION
BARRIER
LSM-1.2/10-D12
1.2VDC
CPU
Figure 2. Distributed Bus Architecture
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Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_LSM_EB.B01
Page 4 of 5
LSM-EB Series
10 Amp DC/DC Power Converter Evaluation Boards
Ordering Guide
All Evaluation Board models have 10 Amp maximum output current and
use identical mounting and pad numbering. Three input voltages (3.3V, 5V
and 12V) are offered. DATEL will review special or custom versions of other
voltages for scheduled quantity applications.
Model Number
LSM-0.8/10-D3EB
LSM-0.8/10-D5EB
LSM-0.8/10-D12EB
LSM-1/10-D3EB
LSM-1/10-D5EB
LSM-1/10-D12EB
LSM-1.2/10-D3EB
LSM-1.2/10-D5EB
LSM-1.2/10-D12EB
LSM-1.5/10-D3EB
LSM-1.5/10-D5EB
LSM-1.5/10-D12EB
DC Output Voltage
0.8 Volts
0.8 Volts
0.8 Volts
1.0 Volts
1.0 Volts
1.0 Volts
1.2 Volts
1.2 Volts
1.2 Volts
1.5 Volts
1.5 Volts
1.5 Volts
DC Input Range
3 to 3.6 Volts
4.5 to 5.5 Volts
10 to 14 Volts
3 to 3.6 Volts
4.5 to 5.5 Volts
10 to 14 Volts
3 to 3.6 Volts
4.5 to 5.5 Volts
10 to 14 Volts
3 to 3.6 Volts
4.5 to 5.5 Volts
10 to 14 Volts
Model Number
LSM-1.8/10-D3EB
LSM-1.8/10-D5EB
LSM-1.8/10-D12EB
LSM-2/10-D3EB
LSM-2/10-D5EB
LSM-2/10-D12EB
LSM-2.5/10-D3EB
LSM-2.5/10-D5EB
LSM-2.5/10-D12EB
LSM-3.3/10-D5EB
LSM-3.3/10-D12EB
LSM-5/10-D12EB
DC Output Voltage
1.8 Volts
1.8 Volts
1.8 Volts
2.0 Volts
2.0 Volts
2.0 Volts
2.5 Volts
2.5 Volts
2.5 Volts
3.3 Volts
3.3 Volts
5.0 Volts
DC Input Range
3 to 3.6 Volts
4.5 to 5.5 Volts
10 to 14 Volts
3 to 3.6 Volts
4.5 to 5.5 Volts
10 to 14 Volts
3 to 3.6 Volts
4.5 to 5.5 Volts
10 to 14 Volts
4.5 to 5.5 Volts
10 to 14 Volts
10 to 14 Volts
USA:
UK:
France:
Japan:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com
Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
Website: www.murata-ps.jp
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
Canada:
Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com
ISO 9001 REGISTERED
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2008 Murata Power Solutions, Inc.
Germany:
München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
China:
04/24/08
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
www.murata-ps.com
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MDC_LSM_EB.B01
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