CBAMTM Load Share (LSL) Series
Features
· Dual input/single output load share module
· Six module voltages 3.3V, 5V, 12V, 15V, 24V, and 48V
· Small package design (1.45" x 2.28" x 0.50")
· Rated up to 60 amps on the output
· Aluminum substrate technology
· All applicable materials used are a minimum of
UL94V-0 rated. Designed to meet UL60950.
· Five year warranty
· Available with RoHS compliant construction, simply
add "(RoHS)" after the part number i.e 5LSL30 (RoHS)
· Excellent MTBF
Description
Calex's LSL Series provide an easy and reliable way to
Selection Chart
parallel DC/DC Converters. The LSL module uses the
Input Voltage Range Output Current Range
positive sense pin for accurate load sharing, leaving
Model VDC ADC
the trim function unaffected. See application section for
Min Max Min Max
layout recommendations.
3R3LSL30 3.0 4.0 0 60
5LSL30 4.0 10.0 0 60
12LSL12 10.0 14.0 0 24
15LSL10 14.0 18.0 0 20
24LSL6 18.0 36.0 Contact the factory
48LSL6 36.0 50.0 Contact the factory
+OUTPUT
+SENSE +SENSE
+VBUS +VOUT
DC/DC Converter
2 3
-OUTPUT 1
8
LSL Module Load
6
4
5 7
+OUTPUT
-VOUT
+SENSE
DC/DC Converter
-OUTPUT
Load Share Module Connected in System
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
1 4/14/08
CBAMTM Load Share (LSL) Series
Input Parameters
Model 3R3LSL30 5LSL30 12LSL12 15LSL10 24LSL6 48LSL6 Units
Input Voltage Range MIN 3.0 4.0 10.0 14.0 18.0 36.0
TYP 3.3 5.0 12.0 15.0 24.0 48.0 VDC
MAX 4.0 10.0 14.0 18.0 36.0 50.0
Input Current, No Load TYP 40 40 40 40 40 40 mA
Input Current Per Pin MIN 0 0 0 0 0 0
MAX 30.0 30.0 12.0 10.0 6.0 6.0 A
Current Share Ratio (3) TYP ±3 %
Output Parameters
Rated Load Range MIN 0 0 0 0 0 0
A
MAX 60 60 24 20 12 12
Load Regulation (4) TYP 1.0
%
MAX 2.0
Short Term Drift (5) TYP <0.1 %
Temperature Coefcient TYP 50
ppm/ºC
MAX 150
Isolation
Baseplate to Ground MIN 700 VDC
Environmental
Baseplate Operating Temperature MIN -40
ºC
Range MAX 100
Storage Temperature Range MIN -40
ºC
MAX 105
Baseplate Thermal Impedance (6) TYP 9 ºC/Watt
MTBF MIL-HDBK-217F (10) MIN 530,329 h
Notes:
(1) All parameters measured at TBaseplate=25ºC, Vin=VNominal, and (10) MTBF is calculated based on MIL-HDBK-217F under the
rated output current unless otherwise noted. Refer to the CALEX following conditions:
Application Notes for the denition of terms, measurement Reliability prediction method = Part Stress Analysis
circuits, and other information. Baseplate temperature = 40ºC
(2) Refer to the CALEX Application Notes for information on fusing. Environment = Ground, Benign
(3) The current share ratio is dened as the percentage of the (11) Available with RoHS and Non-RoHS construction, contact factory
individual converter currents entering the LSL module divided by for details.
50% of the current exiting the LSL module. The latter being the RoHS Compliance means conformity to EU Directive 2002/95/
theoretical optimum load sharing current. This is measured at full EC of 27 January 2003, on the restriction of the use of certain
load. hazardous substances in electrical and electronic equipment,
(4) Load regulation is dened as the output voltage change when lead, cadmium, mercury, hexavalent chromium, polybrominated
changing load current from minimum to maximum. biphenyls, and polybrominated diphenyl ethers are not present
(5) Short Term drift is specied after a 30 minute warm-up at full in quantities exceeding the following maximum concentrations in
load, constant line, load and ambient conditions. any homogeneous material, except for applicable exemptions.
(6) The baseplate thermal impedance is dened as the baseplate 0.1% (by weight of homogeneous material) lead, mercury,
temperature rise over ambient per package watt dissipated. hexavalent chromium, polybrominated biphenyls, polybrominated
(7) Calex CBAMTM modules are designed to withstand most dephenyl ethers, or 0.01% (by weight of homogeneous material)
solder/wash processes. Careful attention should be used cadmium.
when assessing the applicability in your specic manufacturing The RoHS marking is as follows.
process. The CBAMTM modules are not hermetically sealed.
(8) Units are not short circuit or thermally protected.
(9) Torque fasteners into threaded mounting inserts at 12 in. oz. or
less. Greater torque may result in damage to unit and void the
warranty.
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
2 4/14/08
CBAMTM Load Share (LSL) Series
Load Sharing Characteristics
The actual level of load sharing depends on the converter modules used in the setup (see application section).
However, with most DC/DC converters the load sharing accuracy should be relatively high. Calex's HEW series of
DC/DC converters and the corresponding LSL modules were used to obtain the following load share data:
3R3LSL30 Load Sharing:
2 x 24S3.30HEW
35
Individual Converter Current (A)
30
25
20 Unit 1
15 Unit 2
10
5
0
0 10 20 30 40 50 60
Total Load Current (A)
5LSL30 Load Sharing:
2 x 24S5.30HEW
35
Individual Converter Current (A)
30
25
20 Unit 1
15 Unit 2
10
5
0
0 10 20 30 40 50 60
Total Load Current (A)
12LSL12 Load Sharing:
2 x 24S12.12HEW
Individual Converter Current (A)
14
12
10
8 Unit 1
Unit 2
6
4
2
0
0 5 10 15 20 25
CompuMessCurrent (A) GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Total Load Elektronik
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
3 4/14/08
CBAMTM Load Share (LSL) Series
15LSL10 Load Sharing:
2 x 24S15.10HEW
Individual Converter Current (A) 12
10
8
Unit 1
6
Unit 2
4
2
0
0 5 10 15 20
Total Load Current (A)
24LSL6 Load Sharing:
2 x 24S24.6HEW
Individual Converter Current (A)
8
7
6
5
Unit 1
4
Unit 2
3
2
1
0
0 2 4 6 8 10 12 14
Total Load Current (A)
48LSL6 Load Sharing:
2 x Two Series-Connected 24S24.6HEW*
Individual Converter Current (A)
8
7
6
5
Unit 1
4
Unit 2
3
2
1
0
0 2 4 6 8 10 12 14
Total Load Current (A)
*Contact the Factory for Connection Diagram
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
4 4/14/08
CBAMTM Load Share (LSL) Series
Mechanical tolerances unless otherwise noted:
Pin Pin Dia Name
X.XX dimensions: ±0.020 inches
1 0.060" -V1 IN X.XXX dimensions: ± 0.005 inches
2 0.040" +V1 SENSE
3 0.040" +V BUS
ALL GROUNDS ARE DC COMMON
4 0.040" +V2 SENSE
5 0.060" -V2 IN
6 0.060" -VOUT
7 0.060" -VOUT
8 0.040" +SENSE
9 0.040" BASEPLATE
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
5 4/14/08
CBAMTM Load Share (LSL) Series
Load Share Application Section
This application note highlights the capabilities and
limitations of the Load Share series of modules from
Calex.
Load Sharing:
While load sharing can be accomplished in a number of
ways the load sharing scheme implemented in Calex's
LSL modules is the so-called "active load sharing"
with low-side sensing. This means that very accurate
load sharing with minimal load regulation issues is
obtainable. The low line current sensing allows for lower
noise measurements, which improves system load Bottom-side View
sharing. In addition, the offset errors typically associated
with differential measurements in the presence of high Most DC/DC converters are capable of correcting for
common mode voltages are avoided, which in turn voltage drops in PCB traces or wires between the DC/DC
improves the overall load sharing. converter output and the load. The amount of correction
is typically somewhere between 300mV and 500mV. This
The control circuitry inside the LSL module communicates feature has been maintained in the load share module,
via a differential load share bus. This technique provides a which means that voltage drops across load wires in
higher level of noise immunity than a comparable single- low-voltage high-current DC/DC converters can still be
ended communication bus. Whether or not the individual compensated for.
DC/DC converters can operate in a noisy environment
has to be evaluated on a case-by-case basis. Calex offers a mounting kit that allows for easy mounting
of two HEW style converters and one LSL module
with the corresponding voltage rating. This mounting
Recommended Layout: kit follows the recommended layout shown above. In
addition to providing easy module mounting it includes
The following layout is recommended for all dual converter
four test points for measuring individual converter
systems. This becomes especially critical when dealing
currents. The mounting kit utilizes a section of the PCB
with higher voltage converters (such as 24S24.6HEWs)
traces as 1m sense resistors across which the DC/DC
since these have a tendency to generate more RF noise,
converter currents can be measured. (See page 13 for
thus becoming more susceptible to cross talk. Cross talk
part numbers.)
will not affect the performance of the LSL module, but
might affect the performance of the converters.
Performance Curves:
On the following pages is a series of typical performance
curves for the different LSL models. The layout
recommendations shown above have been followed
throughout the data gathering process. To assess the
load sharing accuracy in percentage of total theoretical
converter current the data has been processed through
the following equation:
I Load,Total
I Converter - 2
Load sharing accuracy (deviation) = I Load,Total
100
2
ICONVERTER = Individual converter currents at the
given total load current
ILOAD,TOTAL = Total load current
The result is a deviation in percent of the optimum
Top-side View theoretical load sharing of 50% of total load current.
It should be noted that the following data has been
gathered using a parallel-combination of four very
high precision current sense resistors RS with a total
resistance of 12.5m.
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
Telefon (089) Fax: 925-687-3333 www.calex.com Email: sales@calex.com
6
info@compumess.de · www.compumess.de · www.netzteile.de 4/14/08
CBAMTM Load Share (LSL) Series
3R3LSL30 with two 24S3.30HEW's
20.00%
15.00%
10.00%
5.00%
Unit 1
0.00%
Unit 2
0 10 20 30 40 50 60
-5.00%
-10.00%
-15.00%
-20.00%
Total load current (A)
Load sharing accuracy (deviation)
4.3
3.8
Output voltage (V)
3.3
2.8
2.3
0 10 20 30 40 50 60
Total load current (A)
Load regulation
Deviation (%) at full load: 0.92%
Deviation (A) at full load: 0.27A
Load regulation over entire load range: 0.50V
Voltage drop across RS (included in load regulation above): 0.38V
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
7 4/14/08
CBAMTM Load Share (LSL) Series
5LSL30 with two 24S5.30HEW's
20.00%
15.00%
10.00%
5.00%
Unit 1
0.00%
Unit 2
0 10 20 30 40 50 60
-5.00%
-10.00%
-15.00%
-20.00%
Total load current (A)
Load sharing accuracy (deviation)
6
5.5
Output v oltage (V)
5
4.5
4
0 10 20 30 40 50 60
Total Load Current (A)
Load regulation
Deviation (%) at full load: 1.20%
Deviation (A) at full load: 0.36A
Load regulation over entire load range: 0.53V
Voltage drop across RS (included in load regulation above): 0.38V
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
8 4/14/08
CBAMTM Load Share (LSL) Series
12LSL12 with two 24S12.12HEW's
20.00%
15.00%
10.00%
5.00%
Unit 1
0.00%
0 5 10 15 20 25 Unit 2
-5.00%
-10.00%
-15.00%
-20.00%
Total load current (A)
Load sharing accuracy (deviation)
13
12.5
Output v oltage (V)
12
11.5
11
0 5 10 15 20 25
Total Load Current (A)
Load regulation
Deviation (%) at full load: 0.35%
Deviation (A) at full load: 0.04A
Load regulation over entire load range: 0.30V
Voltage drop across RS (included in load regulation above): 0.15V
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
9 4/14/08
CBAMTM Load Share (LSL) Series
15LSL10 with two 24S15.10HEW's
20.00%
15.00%
10.00%
5.00%
Unit 1
0.00%
0 5 10 15 20 Unit 2
-5.00%
-10.00%
-15.00%
-20.00%
Total load Current (A)
Load sharing accuracy (deviation)
16
Output v oltage (V)
15.5
15
14.5
14
0 5 10 15 20
Total Load Current (A)
Load regulation
Deviation (%) at full load: 0.35%
Deviation (A) at full load: 0.04A
Load regulation over entire load range: 0.30V
Voltage drop across RS (included in load regulation above): 0.15V
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
10 4/14/08
CBAMTM Load Share (LSL) Series
24LSL6 with two 24S24.6HEW's
20.00%
15.00%
10.00%
5.00%
Unit 1
0.00%
0 2 4 6 8 10 12 Unit 2
-5.00%
-10.00%
-15.00%
-20.00%
Total load Current (A)
Load sharing accuracy (deviation)
25
24.5
Output v oltage (V)
24
23.5
23
0 2 4 6 8 10 12
Total Load Current
Load regulation
Deviation (%) at full load: 0.64%
Deviation (A) at full load: 0.04A
Load regulation over entire load range: 0.20V
Voltage drop across RS (included in load regulation above): 0.08V
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
11 4/14/08
CBAMTM Load Share (LSL) Series
48LSL6 with four 24S24.6HEW's *
20.00%
15.00%
10.00%
5.00%
Unit 1
0.00%
0 2 4 6 8 10 12 Unit 2
-5.00%
-10.00%
-15.00%
-20.00%
Total load current (A)
Load sharing accuracy (deviation)
49
48.5
Output voltage (V)
48
47.5
47
0 2 4 6 8 10 12
Total load current (A)
Load regulation
Deviation (%) at full load: 0.43%
Deviation (A) at full load: 0.03A
Load regulation over entire load range: 0.20V
Voltage drop across RS (included in load regulation above): 0.08V
* Contact the factory for connection diagram
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
12 4/14/08
CBAMTM Load Share (LSL) Series
Stability:
Most DC/DC converters have relatively high bandwidths. A mounting kit is comprised of two HEW's of a specied
The LSL modules are optimized for Calex's HEW series voltage along with the load share module, lter capacitors
of DC/DC converters. If the LSL module is used with and connectors.
other DC/DC converters it is recommended that the
crossover frequency (0dB frequency) is veried to be
at least 5kHz. If the crossover frequency is below this
limit the overall system might become unstable. The
reason being that the external current loop in the LSL
modules will interact with the DC/DC converter control.
Calex's DC/DC converters operate with a high crossover
frequency for optimized dynamic response.
Please contact the factory for technical assistance and/
or samples of modied LSL modules for 24 and 48 volt
applications.
Mounting Kit Part Numbers:
Part Number
MS24S3LSL30 MS48S3LSL30
MS24S5LSL30 MS48S5LSL30 Example: A MS24S5LSL30 is a mounting kit with two
MS24S12LSL12 MS48S12LSL12 24S5.30HEW DC/DC converters, a 5LSL30 load share
module, lter capacitors with corresponding voltage
MS24S15LSL10 MS48S15LSL10
rating, and connectors.
MS24S24LSL6 MS48S24LSL6
CompuMess Elektronik GmbH · Lise-Meitner-Str. 1 · D-85716 Unterschleißheim
Telefon (089) 32 15 01 - 0 · Telefax (089) 32 15 01 - 11
info@compumess.de · www.compumess.de · www.netzteile.de
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
13 4/14/08