Isolated 12W 4:1 Input Single & Dual Output DC/DC Converters
Load Regulation
Positive Negative Positive Negative
Output Output Output Output
Typical
Max
%
%
%
1
0.5
0.1
0.1
1.2
0.5
0.1
0.1
0.15
0.05
0.05
0.15
0.05
0.05
1.5
1
0.3
0.3
2
1
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Efficiency
Min.
%
78
85
83
83
81
85
82
84
80
83
84
78
83
83
MTTF
1
Order Code
V
3.3
5
12
15
3.3
5
12
15
±5
±12
±15
±5
±12
±15
A
3.64
2.40
1.00
0.80
3.64
2.40
1.00
0.80
±1.2
±0.5
±0.4
±1.2
±0.5
±0.4
Typ.
%
83.5
88
84.5
85.5
85.5
87.5
84.5
85
81.5
85
86
80
85
85
Hrs
269,492
313,578
230,569
195,596
341,943
418,117
296,593
259,485
182,655
158,750
140,435
165,931
215,533
146,257
FEATURES
UL 60950 recognition pending
4:1 Wide range voltage input
Operating temperature range -40°C to 85°C
Typical load regulation from 0.05%
1.5kVDC Isolation
3.3V, 5V, 12V & 15V outputs
UL 94V-0 Package materials
No electrolytic capacitors
Thermal shutdown
Under voltage lock out
Current fold back
0.3
0.2
0.1
0.5
0.4
0.4
2
1.5
1
2
1
1.5
SELECTION GUIDE (Continued)
Order Code
NCS12S1203C
NCS12S1205C
NCS12S1212C
NCS12S1215C
NCS12S4803C
NCS12S4805C
NCS12S4812C
NCS12S4815C
NCS12D1205C
NCS12D1212C
NCS12D1215C
NCS12D4805C
NCS12D4812C
NCS12D4815C
10% Load
Typ. 12/48V
A
0.15
0.1
0.1
0.06
0.05
0.05
0.03
0.03
0.04
0.04
0.05
0.03
0.03
0.03
Input Current
10% Load
Typ. 24V
A
0.1
0.16
0.06
0.1
0.08
0.08
0.06
0.06
0.07
0.07
0.07
0.07
0.07
0.07
100% Load
Typ. 12/48V
A
1.2
1.1
1.2
1.2
0.3
0.3
0.3
0.3
1.25
1.2
1.5
0.3
0.3
0.4
Ripple and Noise
Typ.
mVp/p
60
50
80
100
100
90
75
90
35
40
55
70
84
55
Max
mVp/p
125
125
125
125
125
125
125
125
100
100
100
100
100
100
PRODUCT OVERVIEW
The NCS12 series of DC/DC converters offers
single & dual output voltages from input voltage
ranges of 9-36V and 18-75V. The NCS12 is
housed in an industry standard package with
a standard pinout. The NCS12 is packaged in a
metal case for improved EMI shielding and is also
encapsulated for superior thermal performance.
Applications include telecommunications, battery
powered systems, process control and distributed
power systems.
INPUT CHARACTERISTICS
Parameter
Voltage range
Conditions
12V input types
48V input types
Turn on threshold 12V input types
Turn off threshold 12V input types
Turn on threshold 48V input types
Turn off threshold 48V input types
NCS12X12
NCS12X48
48V dual output types
All other types
Min.
9
18
Typ.
24
48
8.5
7.5
16.7
15.8
10
100
15
10
Max.
36
75
Units
V
Under voltage lock out
V
Power consumption at
shutdown
Reflected ripple current
mW
mA p-p
1 Calculated using MIL-HDBK-217 FN2, parts stress method with nominal input voltage at full load.
For full details go to
www.murata-ps.com/rohs
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
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KDC_NCS12C.A02
Page 1 of 14
NCS12 Series
Isolated 12W 4:1 Input Single & Dual Output DC/DC Converters
OUTPUT CHARACTERISTICS
Parameter
Conditions
Min.
10
±2
±3
0.1
1
±6.5
±5
5
Typ.
Max.
12
Units
W
%
%
%
%
%V
out
μs
Rated power
All output types
Minimal load to meet datasheet specification
Positive outputs
Voltage set point accuracy
Negative outputs
Line regulation
Cross Regulation
Low line to high line
Positive outputs
Negative outputs
Transient response
D1205 & D4805
D1212, D1215 ,D4812, D4815
Peak deviation (12.5-37.5% & 37.5-12.5% swing)
Single output types
Settling time
(within 1% V
out
Nom.)
Dual output types
0.04
0.3
±4
±2
500
250
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Capacitance
Conditions
Flash tested for 1 seconds
Viso = 1kVDC
S1203, S1205, S4803, S4805
All other types
Min.
1500
1
Typ.
Max.
Units
VDC
GΩ
600
230
pF
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection (for SELV input voltages)
Control pin input voltage
Lead temperature 1.0mm from case for 10 seconds (to JEDEC JESD22-B106 ISS C)
Input voltage, NCS12 12V input types
Input voltage, NCS12 48V input types
30 minutes
18V Max
260°C
40V
80V
GENERAL CHARACTERISTICS
1
Parameter
Switching frequency
Control pin input
Conditions
S1203, S1205, S4803 & S4805
All other types
Module on, pin unconnected or open collector floating
Module off
Min.
Typ.
340
220
Max.
Units
kHz
0.8
V
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Case temperature above ambient
Conditions
With derating - see derating graph
NCS12S1203C
NCS12S1215C, NCS12D1205C, NCS12D4805C
All other types
Single 3.3V & 5V outputs
All other types
Min.
-40
-50
Typ.
Max.
85
125
Units
100% Load, Nom V
IN
,
Still Air
Case Temperature
Thermal shutdown
65
60
44
135
120
°C
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KDC_NCS12C.A02
Page 2 of 14
NCS12 Series
Isolated 12W 4:1 Input Single & Dual Output DC/DC Converters
APPLICATION NOTES
Output Capacitance and start-up times
The NCS12 series does not require output capacitors to meet datasheet specification. To meet datasheet specification, total output capacitance should not exceed:
Part No.
NCS12S1203C
NCS12S1205C
NCS12S1212C
NCS12S1215C
NCS12S4803C
NCS12S4805C
NCS12S4812C
NCS12S4815C
NCS12D1205C
NCS12D1212C
NCS12D1215C
NCS12D4805C
NCS12D4812C
NCS12D4815C
Maximun Load Capacitance (per output)
μF
470
470
220
220
470
470
220
220
220
100
100
220
100
100
Start-up times
ms
16
22
7
8.5
14
22
8
8.5
5
8
9
5
7.5
7
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 specifi ed time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions NCS12 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?”
For a part holding no specifi c agency approvals, such as the NCS12 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 NCS12 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 polyure-
thane) 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 specifi ed 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.
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
www.murata-ps.com
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KDC_NCS12C.A02
Page 3 of 14
NCS12 Series
Isolated 12W 4:1 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.
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.
C1
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_NCS12C.A02
Page 4 of 14
NCS12 Series
Isolated 12W 4:1 Input Single & Dual Output DC/DC Converters
library IEEE;use IEEE.STD_LOGIC_1164.ALL;use IEEE.Std_logic_arith.all;use IEEE.Std_logic_unsigned.all;-- Uncomment the following library declaration if using-- arithmetic functions ......
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