Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
SELECTION GUIDE
Nominal Input
Voltage
Input Current
at rated load
Isolation
Capacitance
pF
30
60
30
30
30
40
22
20
69
70
68
78
79
79
75.5
76
Load
Regulation
Efficiency
Ripple &
Noise
3
Output
Voltage
Output
Current
Order Code
V
CMR100C
CMR118C
5
24
5
5
5
12
5
5
V
5
5
5
±12
±15
±15
5
5
mA
150
150
mV p-p
%
Typ. Max Typ. Max.
mA
%
Min. Typ.
65
65
64
74
76
76
73
74
MIL. Tel.
kHrs
1850
1250
4240
1560
1060
925
3095 61060
2680 56444
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.
CMR0505SA3C
CMR0512S3C
CMR0515S3C
CMR1215S3C
CMR100PC
CMR0505SAP3C
4
9
11
6
10
218
6.8 10
8
15
46
3kVDC Isolation Options
150
9
11 15
25
220
±31
5
6
6.7
8
192
±25
4
6
6.3 8.2
188
±25
3
4.5 6.5
13
80
Short Circuit Protection Options
150 7.5
9
10
25
200
150 7.5
9
20
40
195
INPUT CHARACTERISTICS
Parameter
Voltage range
Input short circuit current
Input reflected ripple
current
Conditions
Continuous operation, 5V input types
Continuous operation, 12V input types
Continuous operation, 24V input types
Short circuit variants
CMR100PC
CMR0505SAP3C
5V & 12V input types
24V input types
Min.
4.5
10.8
21.6
Typ.
5
12
24
95
2
5
2.6
10
Max.
5.5
13.2
26.4
15
15
4
15
MTTF
1
Units
V
mA
mA
p-p
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.
Parameter
Rated Power
2
Voltage Set Point Accuracy
Line regulation
OUTPUT CHARACTERISTICS
Conditions
T
A
=-40°C to 85°C
See tolerance envelope
High V
IN
to low V
IN
; Short circuit types
High V
IN
to low V
IN
; All other output types
Min.
Typ.
Max.
0.75
Units
W
1.15
1.0
1.2
1.2
%/%
ISOLATION CHARACTERISTICS
Parameter
Isolation voltage
Resistance
Conditions
C versions flash tested for 1 second
3C versions flash tested for 1 minute
Viso=1000VDC
Min.
1000
3000
10
Typ.
Max.
Units
VDC
GΩ
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds
5V input types
12V input types
24V input types
260°C
7V
15V
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 T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
KDC_CMR.B01
Page 1 of 11
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
GENERAL CHARACTERISTICS
Parameter
Conditions
5V input types
12V input types
24V input types
CMR100PC
CMR0505SAP3C
Min.
Typ.
110
120
80
97
88
Max.
Units
Switching frequency
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Conditions
All output types
5V output types
All other output types
1kVDC short circuit types
3kVDC short circuit types
Free air convection
Min.
-40
-50
Typ.
Max.
85
125
Units
Case Temperature above ambient
33
28
18
19
°C
Cooling
TOLERANCE ENVELOPES
All 5V output types:
+10%
+2%
V
NOM
+4%
-4%
All other output types:
+8%
+3%
Output Voltage
Output Voltage
+2%
V
NOM
-3%
10
75
50
25
Output Load Current (%)
100
10
25
50
75
100
Output Load Current (%)
Short circuit types:
+10%
Output Voltage
+5%
V
NOM
+2%
-3%
10
25
50
75
100
Output Load Current (%)
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.
www.murata-ps.com/support
KDC_CMR.B01
Page 2 of 11
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
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.
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.
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
TEMPERATURE DERATING GRAPHS
Short Circuit types only.
All other types.
Output Power (W)
0.75
85°C
Output Power (W)
0.75
85°C
Safe Operating Area
0
-40
Safe Operating Area
120°C
0
-40
100
50
0
Ambient Temperature (°C)
150
100
50
0
Ambient Temperature (°C)
150
www.murata-ps.com/support
KDC_CMR.B01
Page 3 of 11
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
EFFICIENCY VS LOAD
CMR100C
CMR118C
CMR0505SA3C
CMR0512S3C
CMR0515S3C
CMR1215S3C
www.murata-ps.com/support
KDC_CMR.B01
Page 4 of 11
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
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