MURATA NML0505SC

NML Series
www.murata-ps.com
Isolated 2W Single Output DC/DC Converters
SELECTION GUIDE
Order Code
Nominal
Input
Voltage
V
NML0505SC
NML0509SC
NML0512SC
NML0515SC
NML1205SC
NML1209SC
NML1212SC
NML1215SC
FEATURES
„
RoHS compliant
V
mA
Input
Current at
Rated Load
mA
5
9
12
15
5
9
12
15
400
222
167
133
400
222
167
133
513
492
479
481
207
198
197
197
Output
Voltage
5
5
5
5
12
12
12
12
Output
Current
Efficiency
Isolation
MTTF1
Capacitance
%
pF
kHrs
78
81
84
83
81
84
85
85
19
27
32
27
28
42
46
54
2327
1393
832
481
716
593
461
328
„
Single isolated output
INPUT CHARACTERISTICS
„
1kVDC isolation
Parameter
„
Efficiency up to 85%
Voltage range
„
Wide temperature performance at full
2 watt load, –40°C to 85°C
Reflected ripple current
Conditions
Min.
Typ.
Max.
Units
Continuous operation, 5V input types
Continuous operation, 12V input types
5V input types
12V input types
4.5
10.8
5.0
12.0
33
38
5.5
13.2
V
Typ.
Max.
Units
2.0
W
1.2
8.5
5.2
5.5
8.5
%/%
200
mV p-p
Max.
Units
mA p-p
„
Power density 2.01W/cm3
„
UL 94V-0 package material
„
Footprint from 1.05cm2
„
Industry standard pinout
„
5V & 12V input
„
5V, 9V, 12V and 15V output
OUTPUT CHARACTERISTICS
Parameter
Conditions
Rated Power
Voltage Set Point Accuracy
Line regulation
TA=-40°C to 85°C
See tolerance envelope
High VIN to low VIN
10% load to rated load, 5V output types
10% load to rated load, 9V output types
10% load to rated load, 12V output types
10% load to rated load, 15V output types
NML0505SC, BW=DC to 20MHz
NML0509SC, BW=DC to 20MHz
NML0512SC, BW=DC to 20MHz
NML0515SC, BW=DC to 20MHz
NML1205SC, BW=DC to 20MHz
NML1209SC, BW=DC to 20MHz
NML1212SC, BW=DC to 20MHz
NML1215SC, BW=DC to 20MHz
Load Regulation2
„
No heatsink required
„
Internal SMD construction
„
Fully encapsulated with toroidal magnetics
„
No external components required
Ripple and Noise
„
MTTF up to 2.3 million hours
„
Custom solutions available
„
Pin compatible with LME & NME series
„
No electrolytic or tantalum capacitors
DESCRIPTION
The NML series of DC/DC Converters is particularly
suited to isolating and/or converting DC power
rails. 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 2 watt output at 85°C. Pin
compatibility with the NME and LME ensures ease
of upgradeability.
Min.
1.0
7.0
4.5
4.5
3.7
96
67
59
53
76
63
53
45
%
ISOLATION CHARACTERISTICS
Parameter
Conditions
Min.
Isolation test voltage
Resistance
Flash tested for 1 second
Viso= 500VDC
1000
10
Typ.
VDC
GΩ
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds
Internal power dissipation
Input voltage VIN, NML05 types
Input voltage VIN, NML12 types
300°C
805mW
7V
15V
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_NML.E02 Page 1 of 5
NML Series
Isolated 2W Single Output DC/DC Converters
GENERAL CHARACTERISTICS
Parameter
Conditions
Switching frequency
5V input types
12V input types
Min.
Typ.
Max.
90
90
Units
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
Min.
Specification
Storage
All output types
-40
-50
Case Temperature above ambient
Cooling
Typ.
5V output types
All other output types
Free air convection
TEMPERATURE DERATING GRAPH
Max.
Units
85
130
45
36
°C
TOLERANCE ENVELOPE
+10%
2
1
0
-40
85°C
Safe Operating Area
100
50
0
Ambient Temperature (°C)
Typical
L
+5%
VNOM
Output Voltage
Output Power (W)
3
150
oad Line
+2.5%
-2.5%
-7.5%
10
75
50
25
Output Load Current (%)
100
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 NML series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second.
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 NML 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 NML 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.
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KDC_NML.E02 Page 2 of 5
NML Series
Isolated 2W Single Output 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.
NML0505SC
NML0509SC
NML0512SC
NML0515SC
NML1205SC
NML1209SC
NML1212SC
NML1215SC
Typical Start-Up Wave Form
Start-up time
μs
790
1154
2265
2998
396
880
1156
2394
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1
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
C2
than 100mΩ at 100 kHz
C3
100nF multilayer ceramic capacitor, general purpose
R1
450Ω resistor, carbon film, ±1% tolerance
R2
50Ω 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
C1 C2 C3
+
SUPPLY
Input
-
+
R1
T1
R2
Y INPUT
Output
-
R LOAD
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KDC_NML.E02 Page 3 of 5
NML Series
Isolated 2W Single Output 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
NML0505SC
NML0509SC
NML0512SC
NML0515SC
NML1205SC
NML1209SC
NML1212SC
NML1215SC
L, μH
22
47
47
68
22
47
47
68
Inductor
SMD
82223
82473
82473
82683
82223
82473
82473
82683
C
Load
DC
Through Hole
11R223C
11R473C
11R473C
11R683C
11R223C
11R473C
11R473C
11R683C
Capacitor
C, μF
2.2uF
1uF
2.2uF
3.3uF
2.2uF
1uF
2.2uF
3.3uF
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KDC_NML.E02 Page 4 of 5
NML Series
Isolated 2W Single Output DC/DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
PIN CONNECTIONS - 4 PIN SIP
SIP Package
0.55
(14.00)
0.295
(7.50)
Pin
Function
1
2
3
4
-VIN
+VIN
-VOUT
+VOUT
TUBE OUTLINE DIMENSIONS
NML0505S
XYYWWi
0.133 (3.38)
0.022 (0.50)
0.018 (0.45)
0.0118 (0.30)
0.0079 (0.20)
0.181 (4.60)
0.142 (3.60)
0.022 (0.50)
0.018 (0.45)
0.394
(10.00)
0.049
(1.25)
0.3
(7.62)
All dimensions in inches ±0.01 (mm ±0.25mm). All pins on a 0.1 (2.54)
pitch and within ±0.01 (0.25) of true position.
Weight: 2.0g
Unless otherwise stated all dimensions in inches (mm) ±0.5mm.
Tube length : 20.47 (520mm ±2mm).
Tube Quantity : 35
RECOMMENDED FOOTPRINT DETAILS
4 HOLES
0.1 (0.00394)
1.15 (0.0453)
Ø
1.00 (0.0394)
2.54
(0.1)
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering
systems with a peak wave solder temperature
of 300oC 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
2.54
(0.1)
Unless otherwise stated all dimensions in inches (mm) ±0.5mm.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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. 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.
© 2012 Murata Power Solutions, Inc.
www.murata-ps.com/support
KDC_NML.E02 Page 5 of 5