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MMV1S0524SC

P1-P3P4-P5
MMV1 Series
3kVDC Isolated 1W Single Output DC/DC Converters with Short Circuit Protection
KDC_MMV1.B02 Page 1 of 5
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SELECTION GUIDE
Order Code
Nominal Input
Voltage
Output
Voltage
Output Current
Input Current at
Rated Load
Load Regulation
(Typ)
Load Regulation
(Max)
Ripple & Noise
(Typ)
Ripple & Noise
(Max)
Efficiency
(Min.)
Efficiency
(Typ.)
Isolation
Capacitance
MTTF
1
V V mA mA % mVp-p % pF kHrs
MMV1S0505SC 5 5 200 250 9 11 20 40 75 78 20 2680
MMV1S0524SC 5 24 41.7 245 4.5 6 15 20 79 81 36 3432
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage range Continuous operation 4.5 5 5.5 V
Input short circuit current I
SC
5V output types 100
mA
24V output types 45
Reflected ripple current 5 15 mA p-p
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds 260°C
Input voltage V
IN 7V
OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated Power
T
A=-40°C to 85°C
1W
Voltage Set Point Accuracy See tolerance envelope
Line regulation High V
IN to low VIN 1.1 1.2 %/%
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation test voltage Flash tested for 1 minute 3000 VDC
Resistance Viso= 1000VDC 10 GΩ
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Switching frequency 88 kHz
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Operating -40 85
°C
Storage -50 125
Case Temperature rise above ambient
25
Cooling Free air convection
1. Calculated using MIL-HDBK-217 FN2 calculation model with nominal input voltage at full load.
All specifications typical at T
A=25°C, nominal input voltage and rated output current unless otherwise specified.
PRODUCT OVERVIEW
The MMV1S series of DC/DC converters are a high
efficiency version of the popular NMV series but
with guaranteed short circuit protection across the
operating temperature range. Short circuits of less
than 1Ω cause the converter to enter a ‘foldback’
limiting mode such that the the input current is
approximately 100mA for 0505 variant and 45mA
for 0524 variant. Protection is continuous and
auto-resetting on removal of the short circuit.
FEATURES
Short circuit protection
Efficiency from 78% typical
Wide temperature performance at full
1 Watt load, –40°C to 85°C
UL 94V-0 package material
3kVDC isolation (1 minute) ‘Hi Pot Test’
Internal SMD construction
Fully encapsulated with toroidal
magnetics
No external components required
No electrolytic or tantalum capacitors
Patent pending
UL60950 recognised
Operation to zero load
MMV1 Series
3kVDC Isolated 1W Single Output DC/DC Converters with Short Circuit Protection
KDC_MMV1.B02 Page 2 of 5
www.murata-ps.com/support
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 MMV1 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 3kVDC for 1 minute.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The MMV1 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 materi-
als, construction and environment. The MMV1 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 MMV1 has been recognized by Underwriters Laboratory (UL) to UL 60950 for functional insulation in a maximum still air ambient temperature of 85°C and/or case temperature
limit of 155ºC (case temperature measured on the face opposite the pins).
The MMV1 converter is 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.
MMV1S0505SC: 0.375A
MMV1S0524SC: 0.4A
The fuses should be UL recognized and rated to at least the maximum allowable DC input voltage.
File number E151252 applies.
TOLERANCE ENVELOPE
The voltage tolerance envelopes show typical load regulation characteristics for this product series. The tolerance envelope is the maximum output voltage variation due to
the changes in output loading.
MMV1S0505SC MMV1S0524SC
+10%
Output Load Current (%)
Output Voltage
+4%
-6%
0%
Typical Load Line
V
NOM
100
75
50
25
10
+5%
+3%
-2%
1%
Output Load Current (%)
Output Voltage
V
NOM
Typical Load Line
100
75
50
25
10
MMV1 Series
3kVDC Isolated 1W Single Output DC/DC Converters with Short Circuit Protection
KDC_MMV1.B02 Page 3 of 5
www.murata-ps.com/support
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 1.25 times the specified output voltage if the output load falls to less than 5%.
Capacitive loading and start up
Typical start up time for the MMV1 series, with a typical input voltage rise time of 2.2µs and output capacitance of 10µF is 370S for 0505 variant and 5.8mS for 0524
variant. 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
TEMPERATURE DERATING GRAPH
150100
50
0
-40
0
0.5
1.0
1.5
Safe Operating Area
85°C
Ambient Temperature (°C)
Output Power (W)
EFFICIENCY GRAPH - MMV1S0505SC
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Efficiency (%)
Load (%)
EFFICIENCY GRAPH - MMV1S0524SC
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Efficiency (%)
Load (%)
P1-P3P4-P5

MMV1S0524SC

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DC DC CONVERTER 24V 1W
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