CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 1 of 11
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SELECTION GUIDE
Order Code
Nominal Input
Voltage
Output
Voltage
Output
Current
Load
Regulation
Ripple &
Noise3
Input Current
at rated load
Efficiency
Isolation
Capacitance
MTTF1
VVmA %mV p-p mA %pF MIL. Tel.
Typ. Max Typ. Max. Min. Typ. kHrs
CMR100C 5 5 150 9 11 6 10 218 65 69 30 1850
CMR118C 24 5 150 6.8 10 8 15 46 65 70 60 1250
3kVDC Isolation Options
CMR0505SA3C 5 5 150 9 11 15 25 220 64 68 30 4240
CMR0512S3C 5 ±12 ±31 5 6 6.7 8 192 74 78 30 1560
CMR0515S3C 5 ±15 ±25 4 6 6.3 8.2 188 76 79 30 1060
CMR1215S3C 12 ±15 ±25 3 4.5 6.5 13 80 76 79 40 925
Short Circuit Protection Options
CMR100PC 5 5 150 7.5 9 10 25 200 73 75.5 22 3095 61060
CMR0505SAP3C45 5 150 7.5 9 20 40 195 74 76 20 2680 56444
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage range
Continuous operation, 5V input types 4.5 5 5.5
VContinuous operation, 12V input types 10.8 12 13.2
Continuous operation, 24V input types 21.6 24 26.4
Input short circuit current Short circuit variants 95 mA
Input reflected ripple
current
CMR100PC 2 15
mA
p-p
CMR0505SAP3C 5 15
5V & 12V input types 2.6 4
24V input types 10 15
OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated Power2TA=-40°C to 85°C 0.75 W
Voltage Set Point Accuracy See tolerance envelope
Line regulation High VIN to low VIN ; Short circuit types 1.15 1.2 %/%
High VIN to low VIN ; All other output types 1.0 1.2
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation voltage C versions flash tested for 1 second 1000 VDC
3C versions flash tested for 1 minute 3000
Resistance Viso=1000VDC 10 GΩ
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds 260°C
5V input types 7V
12V input types 15V
24V input types 28V
1. Calculated using MIL-HDBK-217 FN2 and Telcordia SR-332 calculation model with nominal input voltage at full load.
2. See derating graph.
3. See ripple & noise characterisation method.
4. 3kVDC Isolation
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
FEATURES
Short circuit protection options
UL 60950 recognised
Single or Dual Isolated Outputs
1kVDC or 3kVDC options ‘Hi Pot Test’
Wide temperature performance at full
0.75W load -40°C to 85°C
Industry Standard Pinouts
5V, 12V and 24V Inputs
5V, 12V and 15V Outputs
Pin compatible with NMR, MER1, MMV,
MEV1, NMK, MEV3, NMV series.
DESCRIPTION
The CMR series are a cost effective 0.75W DC/DC
converter series, in an industry standard package
with industry standard pinouts, Popular input and
output voltages are available as a lower power
alternative to a 1W DC/DC converter. The galvanic
isolation allows the device to be configured to
provide an isolated negative rail in systems where
only positive rails exist. The wide temperature
range guarantees startup from –40°C and full
0.75 watt output at 85°C. For the short circuit
protected parts (PC) protection is continuous and
auto-resetting on removal of the short circuit.
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 2 of 11
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GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Switching frequency
5V input types 110
kHz
12V input types 120
24V input types 80
CMR100PC 97
CMR0505SAP3C 88
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specification All output types -40 85
°C
Storage -50 125
Case Temperature above ambient
5V output types 33
All other output types 28
1kVDC short circuit types 18
3kVDC short circuit types 19
Cooling Free air convection
TOLERANCE ENVELOPES
+10%
Output Load Current (%)
Output Voltage
-4%
+4%
VNOM
100
75
50
25
10
+8%
Output Load Current (%)
Output Voltage
-3%
+3%
VNOM
100
75
50
25
10
+2%
All 5V output types: All other output types:
The voltage tolerance envelope shows typical load regulation characteristics for this product series. The tolerance envelope is the maximum output voltage variation due to
changes in output loading.
+2%
+10%
Output Load Current (%)
Output Voltage
-3%
+2%
+5%
100
75
50
25
10
Short circuit types:
VNOM
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 3 of 11
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TECHNICAL NOTES
ISOLATION VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage,
applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions CMR series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second for C versions and 3kVDC
for 1 minute for 3C versions.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The CMR is recognised by Underwriters Laboratory for functional insulation, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or
60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part
could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must
be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to
safety standard requirements.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials,
construction and environment. The CMR series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enameled wire. While
parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically
polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We
therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage.
This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260ºC for 10 seconds. The pin termination finish
on this product series is Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The series is backward compatible with Sn/Pb soldering
systems.
For further information, please visit www.murata-ps.com/rohs
SAFETY APPROVAL
UL60950
The CMR is recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation. The CMR100C and CMR118C in a maximum still air ambient temperature of 100°C as
measured at any point on the case of the unit (hotspot).
FUSING
The CMR Series of converters are not internally fused so to meet the requirements of UL an anti-surge input line fuse should always be used with ratings as defined below.
CMR100xC: 0.5A
CMR118C: 0.12A
CMR05xxxx3C: 0.315A
CMR12xxxx3C: 1A
All fuses should be UL recognized and rated to 125V.
File number E151252 applies.
TEMPERATURE DERATING GRAPHS
150100
50
0
-40
0
0.75
Safe Operating Area
85°C
Ambient Temperature (°C)
Output Power (W)
150100
50
0
-40
0
0.75
Safe Operating Area
85°C
Ambient Temperature (°C)
Output Power (W)
120°C
Short Circuit types only. All other types.
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 4 of 11
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EFFICIENCY VS LOAD
CMR100C CMR118C
CMR0505SA3C CMR0512S3C
CMR0515S3C CMR1215S3C
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 5 of 11
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EFFICIENCY VS LOAD
CMR100PC CMR0505SAP3C
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100110
Efficiency (%)
Load (%)
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100110
Efficiency (%)
Load (%)
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 6 of 11
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APPLICATION NOTES
Minimum load
The minimum load to meet datasheet specification is 10% of the full rated load across the specified input voltage range. Lower than 10% minimum loading will result in
an increase in output voltage, which may rise to typically double the specified output voltage if the output load falls to less than 5%.
Capacitive loading and start up
Typical start up times for this series, with a typical input voltage rise time of 2.2µs and output capacitance of 10µF, are shown in the table below. The product
series will start into a capacitance of 47µF with an increased start time, however, the maximum recommended output capacitance is 10µF.
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1 1µF X7R m ultilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
C2 10µF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC/DC converter with an ESR of less
than 100m at 100 kHz
C3 100nF multilayer ceramic capacitor, general purpose
R1 450 resistor, carbon film, ±1% tolerance
R2 50 BNC termination
T1 3T of the coax cable through a ferrite toroid
RLOAD Resistive load to the maximum power rating of the DC/DC converter. Connections should be made via twisted wires
Measured values are multiplied by 10 to obtain the specified values.
Differential Mode Noise Test Schematic
OSCILLOSCOPE
Y INPUT
SUPPLY
C1 C2 C3 R1 T1 R2
Input Output
DC/DC Converter
R LOAD
+
+
-
-
Typical Start-Up Wave Form
Start-up time
µs
CMR100C 2300
CMR118C 670
CMR0505SA3C 1970
CMR0512S3C 11200
CMR0515S3C 16300
CMR1215S3C 11200
CMR100PC 360
CMR0505SAP3C 370
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 7 of 11
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APPLICATION NOTES (continued)
Output Ripple Reduction
By using the values of inductance and capacitance stated, the output ripple at the rated load is lowered to 5mV p-p max.
Component selection
Capacitor: It is required that the ESR (Equivalent Series Resistance) should be as low as possible, ceramic types are recommended.
The voltage rating should be at least twice (except for 15V output), the rated output voltage of the DC/DC converter.
Inductor: The rated current of the inductor should not be less than that of the output of the DC/DC converter. At the rated current, the DC resistance of the inductor
should be such that the voltage drop across the inductor is <2% of the rated voltage of the DC/DC converter. The SRF (Self Resonant Frequency) should be
>20MHz.
DC
DC
L
CLoad
Power
Source
Inductor Capacitor
L, µH SMD Through Hole C, µF
CMR100C 10 82103C 11R103C 4.7
CMR118C 10 82103C 11R103C 4.7
CMR0505SA3C 22 82223C 11R223C 1
CMR0512S3C 150 82154C 11R154C 0.33
CMR0515S3C 220 82224C 11R224C 0.33
CMR1215S3C 220 82224C 11R224C 0.22
CMR100PC 22 82223C 11R223C 1
CMR0505SAP3C 22 82223C 11R223C 1
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 8 of 11
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EMC FILTERING AND SPECTRA
FILTERING
The following filter circuit and filter table shows the input filters typically required to meet EN 55022 Curve B, Quasi-Peak EMC limit, as shown in the following plots. The
following plots show positive and negative quasi peak and CISPR22 Average Limit B (pink line) and Quasi Peak Limit B (green line) adherence limits.
Inductor Capacitor
Part Number L, µH SMD Through Hole C, µF
CMR100C
CMR118C
CMR0505SA3C
CMR0512S3C
CMR0515S3C
CMR1215S3C
CMR100PC 22 82223C 11R223C 1
CMR0505SAP3C
CMR100C CMR118C
CMR0505SA3C CMR0512S3C
DC
DC
C
L
C Ceramic capacitor
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 9 of 11
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EMC FILTERING AND SPECTRA
CMR0515S3C CMR1215S3C
CMR100PC CMR0505SAP3C
0
10
20
30
40
50
60
70
80
1.00E+05 1.00E+06 1.00E+07 1.00E+08
dBuV
Frequency (Hz)
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 10 of 11
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PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
TUBE OUTLINE DIMENSIONS
5.0 [0.197]
12.43 [0.489]
18.0 [0.709]
9.3 [0.366]
Tube Length : 520mm [20.472] ±2.0 [0.079].
Unless otherwise specified all dimensions in mm [inches] ±0.55mm [0.022].
Tube quantity: 25
C Package
19.50±0.25 [0.768±0.010]
10.00±0.25 [0.394±0.010]
4.10±0.5 [0.161±0.020]
(1.13 [0.044])
(1.93 [0.076])
6.00±0.25 [0.236±0.010]
5.08 [0.200]
0.50±0.05 [0.020±0.002]
0.25±0.05 [0.010±0.002]
12.70 [0.500]
12 4 6
2.54 [0.100]
S
*PIN 6 not fitted on single output variants
*
3C Package
All dimensions in mm (inches) Controlling dimension is mm.
All pins on a 2.54 (0.100) pitch and within ±0.1 (0.004) of true position from pin 1 at seating plane ‘S’ Weight: 2.1g (C) 2.0g (3C) 1.9g (PC)
PIN CONNECTIONS
PIN C 3C
Single Dual
1+VIN +VIN +VIN
2-VIN -VIN -VIN
4-VOUT
5-VOUT -VOUT
6+VOUT 0V
7+V
OUT +VOUT
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
KDC_CMR.B01 Page 11 of 11
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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. © 2016 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
PACKAGE SPECIFICATIONS (continued)
RECOMMENDED FOOTPRINT DETAILS
C Package 3C Package
x4 HOLES
Ø1.15
1.00
[
Ø0.045
0.039
]
2.54 [0.100]
2.54 [0.100]
All dimensions in millimetres ±0.25 (inches ±0.1)
* Hole not required for single output variants
*
Mouser Electronics
Authorized Distributor
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