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CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
SELECTION GUIDE
Nominal Input Voltage Output Voltage Output Current Load
Regulation Ripple &
Noise Input Current at rated load
Efficiency Isolation Capacitance MTTF1
FEATURES Single or Dual Isolated Outputs
1kVDC or 3kVDC options
Wide temperature performance at full 0.75W load -40 C to 85C° 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.
Order Code
mV p-p
%
V V mA Typ. Max Typ. Max. mA Min. Typ. pF 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
INPUT CHARACTERISTICS
Parameter
Conditions
Continuous operation, 5V input types
Voltage range
Continuous operation, 12V input types
Continuous operation, 24V input types
Reflected ripple current
5V & 12V input types 24V input types
Min. Typ. Max. Units
4.5 5 5.5
10.8 12 13.2
V
21.6 24 26.4
2.6 4 mA p-p
10 15
OUTPUT CHARACTERISTICS
Parameter
Conditions
Rated Power2
TA=-40°C to 85°C
Voltage Set Point Accuracy See tolerance envelope
Line regulation
High VIN to low VIN
Min. Typ. Max. Units 0.75 W
1.0 1.2 %/%
ISOLATION CHARACTERISTICS
Parameter
Conditions
Isolation voltage
C versions flash tested for 1 second 3C versions flash tested for 1 minute
Resistance
Viso=1000VDC
Min. Typ. Max. Units
1000 3000
VDC
10 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-217FN2 with nominal input voltage at full load. 2. See derating graph. 3. See ripple & noise characterisation method. All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
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KDC_CMR.A03 Page 1 of 6
GENERAL CHARACTERISTICS
Parameter
Conditions
5V input types
Switching frequency
12V input types
24V input types
CMR Series
Isolated 0.75W Single and Dual Output Isolated DC/DC Converters
Min. Typ. Max. Units 110 120 kHz 80
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
Specification
All output types
Storage
5V output types Case Temperature above ambient
All other output types
Cooling
Free air convection
Min. Typ. Max. Units -40 85 -50 125
°C 33 28
TOLERANCE ENVELOPES
All 5Voutput types
+10%
+6%
+2% VNOM
Typical Load Line
+4% 0% -4%
All other output types +8%
+5%
+2% V
NOM
Typical Load Line
+3% 0% -3%
Output Voltage Output Voltage
10 25 50 75 100 Output Load Current (%)
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.
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?”
For a part holding no specific agency approvals, such as the CMR series, 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 saf.