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PDF MEF1S2403SPC Data sheet ( Hoja de datos )
| Número de pieza | MEF1S2403SPC | |
| Descripción | Isolated 1W Regulated Single Output DC/DC Converters | |
| Fabricantes | Murata | |
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www.murata-ps.com
MEF1 Series
Isolated 1W Regulated Single Output DC/DC Converters
SELECTION GUIDE
FEATURES
UL60950 recognised
Short circuit protection
Operation to zero load
Output regulation <1%
Power density 0.85W/cm3
Single isolated output
UL 94V-0 package material
Footprint from 1.17cm2
1kVDC or 3.5kVDC isolation options
3.3V, 5V, 12V & 24V input
3.3V & 5V output
SMD construction
Fully encapsulated with toroidal magnetics
DESCRIPTION
The MEF1 series of DC/DC converters is used
where a tightly regulated supply is required. They
are ideal for situations where the input voltage
is not tightly controlled. The single rail regulated
output makes the ideal choice to power sensors,
such as pressure transducers, hall effect sensors
and mass airflow sensors.
Order Code
MEF1S0303SPC
MEF1S0305SPC
MEF1S0503SPC
MEF1S0505SPC
MEF1S1203SPC
MEF1S1205SPC
MEF1S2403SPC
MEF1S2405SPC
MEF1S0303SP3C
MEF1S0305SP3C
MEF1S0503SP3C
MEF1S0505SP3C
MEF1S1203SP3C
MEF1S1205SP3C
MEF1S2403SP3C
MEF1S2405SP3C
V V mA
mVp-p
mA % % pF
3.3 3.3 303 11 35 460 63 66 40
3.3 5 200 9 35 430 68 71 30
5 3.3 303 8 30 290 65 68.5 40
5 5 200 10 40 275 69 73 50
12 3.3 303 11 35 120 65 69 40
12 5 200 10 35 115 69 73.5 60
24 3.3 303 13 40 60 64 69 35
24 5 200 13 40 55 68 73 45
3.5kVDC Isolation Part Numbers
3.3 3.3 303 11 35 460 63 66 40
3.3 5 200 9 35 430 68 71 30
5 3.3 303 8 30 290 65 68.5 40
5 5 200 10 40 275 69 73 50
12 3.3 303 11 35 120 65 69 40
12 5 200 10 35 115 69 73.5 60
24 3.3 303 13 40 60 64 69 35
24 5 200 13 40 55 68 73 45
kHrs
495
867
665
1051
511
1044
580
834
495
867
665
1051
511
1044
580
834
INPUT CHARACTERISTICS
Parameter
Conditions
Continuous operation, 3.3V input types
Voltage range
Continuous operation, 5V input types
Continuous operation, 12V input types
Continuous operation, 24V input types
Reflected ripple current
Min.
3.135
4.75
11.4
22.8
Typ.
3.3
5
12
24
5
Max.
3.465
5.25
12.6
25.2
20
Units
V
mA p-p
OUTPUT CHARACTERISTICS
Parameter
Conditions
3.3V Output
Voltage set point accuracy
5V Output
Rated power
TA= -40°C to 85°C
Line regulation
High VIN to low VIN
Load regulation
10% load to rated load
Min. Typ.
0.3
Max.
± 2.5
±2
1
0.25
1
Units
%
W
%/%
%
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
Lead temperature 1.5mm from case for 10 seconds
Internal power dissipation
Input voltage VIN, MEF1S03 types
Input voltage VIN, MEF1S05 types
Input voltage VIN, MEF1S12 types
Input voltage VIN, MEF1S24 types
Continuous
260°C
450mW
4V
7V
18V
28V
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
www.murata-ps.com/support
KDC_MEF1.C02 Page 1 of 7
1 page  
MEF1 Series
Isolated 1W Regulated Single Output 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 MEF1 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second for SPC versions and 3.5kVDC
for 1 minute for SP3C versions.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The MEF1 has been recognized 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 MEF1 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
The MEF1 series has been recognized by Underwriters Laboratory (UL) to UL 60950 for functional insulation, file number E151252 applies. The MEF1 Series of converters are not
internally fused so to meet the requirements of UL 60950 an anti-surge input line fuse should always be used with ratings as defined below.
MEF1S03xxxC: 600mA
MEF1S05xxxC: 400mA
MEF1S12xxxC: 160mA
MEF1S24xxxC: 100mA
All fuses should be UL approved and rated to at least the maximum allowable DC input voltage.
www.murata-ps.com/support
KDC_MEF1.C02 Page 5 of 7
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