Isolated 6W Wide Input Single & Dual Output DC/DC Converters
SELECTION GUIDE
Input
Voltage Output
Voltage
Nom.
V
NDS6D2405C
NDS6D2412C
NDS6D2415C
NDS6S2405C
NDS6S2412C
NDS6S2415C
24
24
24
24
24
24
Output Current
Min.
Load
A
±0.06
±0.025
±0.020
0.12
0.05
0.04
Input Current
Order Code
2
V
±5
±12
±15
5
12
15
±100% 0%
Load Load
A
mA
±0.6
±0.250
±0.200
1.2
0.5
0.4
7
7
7
4
5.5
6
Efficiency
Ripple
100% Shut & Noise
Min. Typ.
Load Down
mA
mA mV p-p %
%
300
290
290
305
290
290
1.1
1.1
1.1
1.1
1.1
1.1
40
40
45
40
40
40
80
85
85
80
84
85
82
87
87
82
86
87
MTTF
1
kHrs
FEATURES
UL 60950 recognized
RoHS compliant
2:1 Wide range voltage input
Operating temperature range
–40°C to 85°C
Short circuit protection
0.2% Typical load regulation
1.5kVDC Isolation ‘Hi-Pot Test’
24V Nominal input
Single & dual outputs
Power density 0.94W/cm
3
INPUT CHARACTERISTICS
Parameter
Voltage range
Reflected ripple current
Conditions
All NDS6D24 & NDS6S24 types
All NDS6D24 & NDS6S24 types
Min.
18
Typ.
24
7
Max.
36
Units
V
mA p-p
OUTPUT CHARACTERISTICS
Parameter
Rated power
Voltage set point accuracy
Positive & negative except NDS6D2405 negative
output
NDS6D2405 negative output
Positive outputs
Conditions
Min.
Typ.
Max.
6
±2
±4
Units
W
%
0.01
0.02
0.2
0.2
0.1
%
0.2
1.7
%
1
5
%
2
Line regulation
Low line to high line
Negative outputs
Optional remote On/Off
UL 94V-0 Package materials
No electrolytic capacitors
Low noise
Load regulation
10% total load to
100% total load
5V outputs
12V & 15V outputs
5V
12V & 15V
PRODUCT OVERVIEW
The NDS6 series of DC/DC converters offer single
and dual output voltages from an input voltage
range of 18-36V. The NDS6 is housed in an indus-
try standard package with a standard pinout. The
NDS6 is packaged in a metal case for improved
EMI shielding and is also encapsulated for supe-
rior thermal performance. Versions with optional
remote on/off control pin are also available.
Applications include telecommunications, battery
powered systems, process control and distributed
power systems.
Cross regulation
% voltage change on negative output
when positive load varies from 12.5%
(0.75W) to 37.5% (2.25W) with
negative load fixed at 50% (3W)
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Capacitance
Conditions
Flash tested for 1 second
Viso = 1kVDC
Min.
1500
1
Typ.
Max.
Units
VDC
GΩ
pF
225
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
Internal power dissipation
Lead temperature 1.0mm from case for 10 seconds (to JEDEC JESD22-B106 ISS C)
Minimum output load for specification
3
Control pin input voltage
Input voltage, NDS6 24V input types
Continuous
2.7W
260°C
10% of rated load on each output
±18V
40V
1 Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2 To order with optional control pin, prefix C with “E”. For example NDS6D0505EC.
3 Operation below 10% minimum load may cause increased output ripple.
All specifications typical at T
A
=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_NDS6.E01
Page 1 of 6
NDS6 Series
Isolated 6W Wide Input Single & Dual Output DC/DC Converters
GENERAL CHARACTERISTICS
1
Parameter
Switching frequency
Module ON (or pin unconnected)
Control pin input
Module OFF
3.0
0
0.8
1.5
Conditions
Min.
Typ.
130
Max.
Units
kHz
V
mA
V
mA
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Case temperature rise above ambient
Thermal shutdown
100% Load, Nom V
IN
, Still Air,
Case Temperature
5V
12V & 15V
Conditions
Min.
-40
-50
Typ.
Max.
85
130
Units
29
22
110
°C
APPLICATION NOTES
Control Pin
This provides an OFF function, which puts the converter into a low
power mode, when the voltage applied to the pin is less than 0.8V.
When the pin is high or un-connected, the converter is on.
NDS6D 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
datasheet specification, a minimum load of 10% of output load current is required on each output.
The NDS6D can be used with much lighter loading but the negative output voltage may rise above
maximum datasheet specification.
Output Capacitors
The NDS6 series does not require output capacitors to meet datasheet specification. To meet datasheet specification, output capacitance should not exceed:
Output Voltage (V)
5
12
15
Output Capacitance (μF)
470
470
220
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 NDS6 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1.5kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The NDS6 has been recognized by Underwriters Laboratory for functional isolation. 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 NDS6 series has an ER 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_NDS6.E01
Page 2 of 6
NDS6 Series
Isolated 6W Wide Input Single & Dual Output DC/DC Converters
SAFETY APPROVAL
The NDS6 series has been recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation in a maximum ambient temperature of 85ºC and/or case temperature
limit of 120ºC (case temperature measured on the face opposite the pins). File number E151252 applies.
Note: This series gained UL 60950 recognition for products manufactured on or after datecode G1148, any NDS6 parts manufactured before this date code should not be consid-
ered UL 60950 recognized. Any NDS6 that is UL recognized will be printed with the UL logo.
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
CHARACTERISATION TEST METHODS
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
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
EFFICIENCY VS LOAD
NDS 24V Input, Dual Output
90
80
Efficiency (%)
60
50
40
30
20
10
0
0
10
20
30
40
50
60
Load (%)
70
80
90
100
12V
5V
Efficiency (%)
70
15V
NDS 24V Input, Single Output
90
80
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
90
100
Load (%)
5V
15V
12V
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KDC_NDS6.E01
Page 3 of 6
NDS6 Series
Isolated 6W Wide Input Single & Dual Output DC/DC Converters
TEMPERATURE DERATING
NDS6D2405C
7
6
Output Power (W)
Output Power (W)
5
4
3
2
1
0
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
Ambient Temperature (ºC)
NDS6D2412C
7
6
600 lfm
500 lfm
400 lfm
300 lfm
200 lfm
100 lfm
still air
5
4
3
2
1
0
600 lfm
500 lfm
400 lfm
300 lfm 200 lfm
100 lfm
still air
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
Ambient Temperature (ºC)
NDS6D2415C
7
6
Output Power (W)
NDS6S2405C
7
6
Output Power (W)
600 lfm
500 lfm
200 lfm
400 lfm
300 lfm
5
4
3
2
1
0
600 lfm
500 lfm
400 lfm
300 lfm
200 lfm
100 lfm
still air
5
4
100 lfm
3
2
still air
1
0
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
Ambient Temperature (ºC)
Ambient Temperature (ºC)
NDS6S2412C
7
6
NDS6S2415C
7
6
Output Power (W)
Output Power (W)
5
4
3
2
1
0
600 lfm 500 lfm
400 lfm
300 lfm
200 lfm
100 lfm
still air
5
600 lfm 500 lfm 400 lfm 300 lfm
4
3
2
1
0
-40 -30 -20 -10 0
10
20
30
200 lfm 100 lfm
still air
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
40
50
60
70
80
Ambient Temperature (ºC)
Ambient Temperature (ºC)
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KDC_NDS6.E01
Page 4 of 6
NDS6 Series
Isolated 6W Wide Input Single & Dual Output DC/DC Converters
EMC FILTERING AND SPECTRA
FILTERING
The module includes a basic level of filtering, typically sufficient to meet EN 55022 Curve A Quasi-Peak EMC limit, as shown in the following plots.
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