CME0505DC [MURATA]
民用设备,工业设备;
muRata 
CME Series
s
Isolated 0.75W Single Output Isolated DC/DC Converters
SELECTION GUIDE
%
mV p-p
%
V
V
mA
mA
pF kHrs
Typ. Max. Typ. Max.
10 12 15 25
10 12 15 25
Min. Typ.
CME0505DC
CME0505SC
CME0512SC
5
5
5
5
5
150
150
63
218
218
195
67
67
72
70
70
77
30 3400
30 3400
33 2200
FEATURES
12
5
7
20 30
ꢀSingle Isolated output
3KVDC isolation options
ꢀ1kVDC or 3kVDC option
CME0303S3C
CME0305S3C
CME0505S3C
CME0512S3C
3.3
3.3
5
3.3
5
227
150
150
63
9
9
9
5
12 15 25
12 15 25
12 15 25
300
300
218
200
66
68
65
70
73
73
70
75
30 1230
35 630
28 2400
30 630
ꢀWide temperature performance at full 1
5
Watt load -40 C to 85C°
5
12
7
10 15
ꢀIndustry Standard Pinout
ꢀ3.3V and 5V Inputs
INPUT CHARACTERISTICS
Parameter
Conditions
Min.
2.97
4.5
Typ.
Max.
3.63
5.5
2
Units
V
Continuous operation, 3.3V input types
Continuous operation, 5V input types
3.3V input types
3.3
5.0
1.5
2
ꢀ3.3V, 5V & 12V outputs
Voltage range
ꢀPin Compatible with LME, MEE1, MEE3,
Reflected ripple current
mA
NKE, NME, & NML series
5V input types
2.5
OUTPUT CHARACTERISTICS
PRODUCT OVERVIEW
Parameter
Conditions
Min.
Typ.
1.0
Max.
0.75
Units
W
The CME series are a cost effective 0.75W DC/DC
converter series, in industry standard packages
with industry standard pinout., 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.
Rated Power
TA=-40°C to 120°C, see derating graphs
Voltage Set Point Accuracy See tolerance envelope
Line regulation High VIN to low VIN
1.2
%/%
ISOLATION CHARACTERISTICS
Parameter
Conditions
Min.
1000
3000
Typ.
Max.
Units
VDC
GΩ
C Versions Flash tested for 1 second
3C Versions Flash tested for 1 second
Viso= 1000VDC
Isolation test voltage
Resistance
10
GENERAL CHARACTERISTICS
Parameter
Conditions
CME0505
Min.
Typ.
120
135
Max.
Units
kHz
Switching frequency
All other types
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds
260°C
Input voltage VIN, 3.3V input
5.5V
7V
Input voltage VIN, 5V input
1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
For full details go to
www.murata-ps.com/rohs
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KDC_CME.A03 Page 1 of 7
CME Series
Isolated 0.75W Single Output Isolated DC/DC Converters
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Conditions
All output types
Min.
-40
Typ.
Max.
85
Units
°C
-50
130
41
3.3V & 5V output types
12V output types
Case temperature rise above
ambient
32
Cooling
Free air convection
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 CME 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
second 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 CME 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
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 CME 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
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KDC_CME.A03 Page 2 of 7
CME Series
Isolated 0.75W Single Output Isolated DC/DC Converters
TEMPERATURE DERATING GRAPHS
0303, 0305 types only.
All other types.
85°C
85°C
0.75
0.75
Safe Operating Area
Safe Operating Area
120°C
150
0
-40
0
-40
100
150
0
50
100
0
50
Ambient Temperature (°C)
Ambient Temperature (°C)
TOLERANCE ENVELOPES
5V output types.
3.3V output types.
+8%
+12%
+8%
+4%
VNOM
+3%
VNOM
+4%
-0%
-4%
0%
-2%
-5%
-10%
100
75
Output Load Current (%)
100
10 25
50
75
Output Load Current (%)
10 25
50
12V output types.
+8%
+5%
+3%
+2%
VNOM
0%
-3%
100
75
Output Load Current (%)
10 25
50
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.
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KDC_CME.A03 Page 3 of 7
CME Series
Isolated 0.75W Single Output Isolated DC/DC Converters
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.
Typical Start-Up Wave Form
Start-up time
μs
CME0505DC
CME0505SC
CME0512SC
CME0303S3C
CME0305S3C
CME0505S3C
CME0512S3C
1000
1000
5600
540
1300
1080
5000
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1
C2
1μF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
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 100mꢀ at 100 kHz
C3
R1
100nF multilayer ceramic capacitor, general purpose
450ꢀ resistor, carbon film, 1% tolerance
R2
50ꢀ 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
DC/DC Converter
OSCILLOSCOPE
Y INPUT
R2
C1 C2 C3
R1
T1
+
+
Input
Output
SUPPLY
-
-
R LOAD
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KDC_CME.A03 Page 4 of 7
CME Series
Isolated 0.75W Single Output Isolated DC/DC Converters
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.
L
DC
Power
Source
Load
C
DC
Inductor
SMD
Capacitor
L, μH
47
Through Hole
11R473C
11R473C
11R683C
11R103C
11R473C
11R103C
11R683C
C, μF
4.7
4.7
1
CME0505DC
CME0505SC
CME0512SC
CME0303S3C
CME0305S3C
CME0505S3C
CME0512S3C
82473C
82473C
82683C
82103C
82473C
82103C
82683C
47
68
10
4.7
4.7
4.7
0.68
47
10
68
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KDC_CME.A03 Page 5 of 7
CME Series
Isolated 0.75W Single Output Isolated DC/DC Converters
PACKAGE SPECIFICATIONS
3C Package
DC Package
SC Package
11.48
(0.45)
11.48
(0.45)
9.80 (0.386)
CME0505DC
6.00
(0.236)
6.00
(0.236)
XYYWW
11.50 (0.453)
7.46
(0.293)
6.80 (0.267)
CME0505S3C
0.55 (0.022)
0.45 (0.018)
10.0
(0.393)
XYYWW
CME0505SC
0.55 (0.022)
0.45 (0.018)
XYYWW
1
2
3
4
4.60 (0.181)
3.60 (0.142)
4.60 (0.181)
3.60 (0.142)
1
2
3
4
0.55 (0.022)
0.45 (0.018)
0.50 0.05
(0.0196 0.00196)
4.60 (0.181)
3.60 (0.142)
2.54 (0.1)
0.55 (0.022)
0.45 (0.018)
2.18 0.50
(0.086 0.0197)
1.89 (0.074)
2.77 (0.109)
1
4
0.30 (0.0118)
0.20 (0.0078)
0.30 (0.0118)
0.20 (0.0078)
1.09 (0.043)
7.62 (0.3)
1.25
(0.049)
1.25
(0.049)
7
5
0.30 (0.0118)
0.20 (0.0078)
5.08 (0.2)
7.62 (0.3)
7.62
(0.3)
7.62
(0.3)
1.94 (0.0763)
Weight: 1.09g (3C) 1.30g (SC) 1.38g (DC)
All dimensions in millimetres 0.25mm (“ 0.01”). All pins on a 2.54 (0.1) pitch and within 0.25 (0.01) of true position.
PIN CONNECTIONS - 8 PIN DC
PIN CONNECTIONS - 4 PIN 3C & SC
Pin
1
Function
-VIN
Pin
1
Function
-VIN
4
+VIN
2
+VIN
5
+VOUT
-VOUT
3
-VOUT
7
4
+VOUT
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KDC_CME.A03 Page 6 of 7
CME Series
Isolated 0.75W Single Output Isolated DC/DC Converters
PACKAGE SPECIFICATIONS (continued)
RECOMMENDED FOOTPRINT DETAILS
8 Pin DC Package
4 Pin 3C & SC Package
4 HOLES
0.1 (0.00394)
1.15 (0.0453)
1.00 (0.0394)
Ø
2.54
(0.1)
2.54 (0.1)
4 HOLES
0.1 (0.00394)
1.15 (0.0453)
1.00 (0.0394)
Ø
2.54
(0.1)
2.54 (0.1)
TUBE OUTLINE DIMENSIONS
DC Tube
SC Tube
3C Tube
12.0 (0.472)
9.30 (0.366)
7.70 (0.303)
5.07 (0.199)
5.10 (0.2)
0.65 (0.026)
4.45 (0.175)
Unless otherwise stated all dimensions in inches (mm) 0.5mm.
Tube length (8 Pin DIP) : 20.47 (520mm 2mm).
5.00 (0.2)
Tube Quantity : 40
Tube length (4 Pin SIP) : 20.67 (525mm 2mm).
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260°C for 10 seconds. The pin termination finish
on the SIP package type is Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The DIP types are Matte Tin over Nickel Preplate. Both
types in this series are backward compatible with Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
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/
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 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.
© 2014 Murata Power Solutions, Inc.
www.murata-ps.com/support
KDC_CME.A03 Page 7 of 7
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