1. Suffix ‘EC’ indicates optional CTRL pin is fitted, as indicated in the mechanical dimensions section.
2. Please refer to minimum load application notes section on page 4.
3. See ripple & noise characterisation method.
All specifications typical at TA=25°C, with recommended input/output capacitors (refer to application note), nominal input voltage and
rated output current unless otherwise specified.
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KDC_NDXC.G01
Page 1 of 6
Closest Alternative
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Input Current at 0%
Load
Efficiency (Min.)
Input Current at
shutdown
NDX Series
Isolated 7.5W Wide Input Single & Dual Output DC/DC Converters
INPUT CHARACTERISTICS
Parameter
Voltage range
Conditions
5V input types
12V input types
24V input types
48V input types
5V input types with 100μF at input
12V input types with 100μF at input
24V input types with 10μF at input
48V input types with 10μF at input
5V input types with 100μF at input
12V input types with 100μF at input
24V input types with 10μF at input
48V input types with 10μF at input
BW=20Hz to 300kHz, with external input/output capacitors
Single outputs Dual outputs
Min.
4.5
9
18
36
Typ.
5
12
24
48
70
18
90
80
115
60
50
54
5
Max.
9
18
36
75
Units
V
Reflected ripple current
mA p-p
Ripple & noise
1
10
mVrms
OUTPUT CHARACTERISTICS
Parameter
Rated power
Voltage set point accuracy
Conditions
NDXx0505 types
All other types
With external input/output capacitors
Low line to high line, with external
input/output capacitors
25% total load to 100% total load
With external input/output capacitors
Dual output
Single output
5V & 12V Input
24V & 48V Input
5V & 12V Input
24V & 48V Input
All types
5V & 12V input
24V & 48V input
All types
5V output
12V, 15V output
5V output
12V, 15V output
Min.
Typ.
Max.
6.0
7.5
±5
±5
0.9
0.4
0.4
0.9
0.75
0.20
6
5
7
5
Units
W
%
Line regulation
Load regulation
Dual output
Single output
±3
±2
0.1
0.04
0.04
0.2
0.2
0.07
3.8
1.5
2.5
2.5
%
%
Cross regulation
(dual outputs)
% voltage change on negative output 5V & 12V input
when positive load varies from 25%
to 75% with negative load fixed at
100%
24V & 48V input
%
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
(Max. case temperature rise 95°C above ambient)
Lead temperature 1.0mm from case for 10 seconds (to JEDEC
JESD22-B106 ISS C)
Minimum output load for specification
2
Control pin input voltage
Input voltage, NDXD05,
Input voltage, NDXD12, NDXS12 types
Input voltage, NDXD24, NDXS24 types
Input voltage, NDXD48, NDXS48 types
12V, 15V outputs
Continuous
5V output, VIN = nominal, 25ºC Continuous
260°C
25% of rated load on each output
7V
10V
20V
40V
80V
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
Viso = 1kVDC
Min.
1000
1
Typ.
Max.
Units
VDC
GΩ
1. See ripple & noise characterisation method
2. Please refer to minimum load application notes section on page 4.
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KDC_NDXC.G01
Page 2 of 6
NDX Series
Isolated 7.5W Wide Input Single & Dual Output DC/DC Converters
GENERAL CHARACTERISTICS
Parameter
Conditions
100% total load to 25% total load
(Dual Output Types)
100% total load to 25% total load
(Single Output Types)
5V & 12V input
24V & 48V input
5V, 12V & 24V input
48V input
Single outputs
Module ON (or pin unconnected)
Dual outputs
Control pin input
1
Min.
5V, 12V & 15V outputs
5V outputs
12V & 15V outputs
12V & 15V output
12V & 15V output
100
100
90
90
-0.6
0
-0.6
-0.1
3.0
0.7
3.0
0.3
Typ.
Max.
900
680
620
850
600
0.8
0.1
0.8
0.2
7.0
3.0
7.0
3.0
Units
Switching frequency
kHz
Single outputs
Module OFF
Dual outputs
V
mA
V
mA
V
mA
V
mA
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Case temperature rise above ambient
100% Load, Nom V
IN
, Still Air
1212, 1215, 2412, 2415, 4812, 4815
0512, 2405, 4805
0505, 0515, 1205
Conditions
Min.
-40
-50
Typ.
Max.
85
130
Units
35
43
48
°C
MEAN TIME TO FAILURE (MTTF)
2
Part Number
NDXD2412C
NDXD2415C
NDXD4812C
NDXD4815C
1. See application notes on page 4.
2. Calculated using MIL-HDBK-217F 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.
0°C
2590
2492
2587
2351
25°C
1528
1462
1558
1379
Units
kHrs
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260ºC for 10
seconds. The pin termination finish on this product series is a Gold flash (0.05-0.10 micron) over Nickel Preplate.
The series is backward compatible with Sn/Pb soldering systems. For further information, please visit
www.murata-ps.com/rohs
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KDC_NDXC.G01
Page 3 of 6
NDX Series
Isolated 7.5W Wide Input Single & Dual Output DC/DC Converters
APPLICATION NOTES
External Capacitance
Although these converters will work without external capacitors, they are
necessary in order to guarantee the full parametric performance over the full
line and load range. All parts have been tested and characterised using the
following values and test circuit.
Value
Input Voltage
5V & 12V
24V & 48V
C
IN
100μF, 100V
10μF, 200V
C
OUT1
0.1μF, 25V multi-layer
ceramic
C
OUT2
100μF, 25V (low ESR)
Recommended Input & Output Capacitors
+V
IN
C
IN
+V
OUT
C
OUT1
C
OUT2
C
IN
+V
IN
+V
OUT
C
OUT1
C
OUT2
C
OUT2
OV
C
OUT1
NDXSC
-V
IN
OV
NDXDC
-V
IN
-V
OUT
Control Pin
Dual Output:
This provides an OFF function, which puts the converter into a low
power mode. When the pin is high the converter is OFF. Standard TTL levels can
be used but the maximum high level must not exceed 7.0V. The pin can be left
open for normal operation or at voltage below 0.8V with respect to the -V
IN
pin.
Single Output:
As per dual output, however a series diode must be fitted when
the control pin is used on the single output variants. Recommended diode
1N4148 or similar (direction of fitting is cathode to control pin).
Cross Regulation
Load regulation is at its best when the positive and negative loads are balanced.
When the loads are asymmetric, the negative output is not as tightly regulated as the
positive output. To meet ripple specification a total minimum load of 25% full load
is required, however, the NDX can be used with much lighter loading at the expense
of increased ripple. A small load of 150mW is required on the negative output to
ensure the maximum negative output voltage is not exceeded. NDX cross regulation
is defined on page 2.
Minimum load
The minimum load for correct operation is 25% of the full rated load across the specified input voltage range. Lower loads may cause a significant increase in output ripple
and may cause the output voltage to exceed its specification transiently during power-down when the input voltage also falls below its rated minimum. A minimum loading
of 30% load is required on NDXD4805 to prevent output voltage rise above specification during power-down.
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 NDX 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 NDX 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 NDX series has an EI ferrite core, 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_NDXC.G01
Page 4 of 6
NDX Series
Isolated 7.5W Wide Input Single & Dual Output DC/DC Converters
CHARACTERISATION TEST METHODS
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration with the inclusion of recommended input and output capacitors.
C1
C2
C3
R1
R2
T1
RLOAD
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 100mΩ at 100 kHz
100nF multilayer ceramic capacitor, general purpose
450Ω resistor, carbon film, +/-1% tolerance
50Ω BNC termination
3T of the coax cable through a ferrite toroid
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
Input Reflected Ripple Current Test Method
Input reflected ripple current measurements are performed with the following test configuration with the inclusion of recommended input and output capacitors.
C1
L1
C2
220uF with ESR of <0.1Ω at 100kHz, rated at supply voltage
12uH rated at 150% minimum of the DC current taken by the converter.
The recommended input capacitor for the DC/DC converter.
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