NCS1 Series

NCS1 Series
www.murata-ps.com
Isolated 1W 4:1 Input Single Output DC/DC Converters
Order Code
Efﬁciency
Input
Voltage Output Output 5V or 24V Input.
Voltage Current
Nom.
V
V
mA
Min.
%
Typ.
%
Min.
%
Typ.
%
12
12
12
24
24
24
3.3
5
12
3.3
5
12
303
200
83
303
200
83
73
76
75
76
79
80
77
79
78
78.5
82
83
71
74
75
73
77
77
75
77
79
76
80
80
NCS1S1203SC
NCS1S1205SC
NCS1S1212SC
NCS1S2403SC
NCS1S2405SC
NCS1S2412SC
FEATURES

UL 60950 recognition pending

4:1 Wide range voltage input

Operating temperature range -40°C to
105°C with derating

1 kVDC Isolation
Efﬁciency
12V Input.
Ripple and Noise
Typ.
Max.
mVp/p mVp/p
24
25
40
35
27
28
70
50
120
70
50
120
Isolation
Capacitance
SELECTION GUIDE
pF
MTTF1
Hrs
24
30
35
28
42
42
INPUT CHARACTERISTICS
Parameter
Voltage range
Conditions
Min.
Typ.
Max.
12V input types
4.5
12
18
24V input types
9
24
36
NCS1S12XX
Input current
5V input voltage
0.26
12V input voltage
0.1
12V input voltage
0.1
24V input voltage
0.05

3.3V, 5V & 12V outputs

No electrolytic capacitors
NCS1S12XX
5
30
NCS1S24XX
5
15

Continuous short circuit protection
V
A
NCS1S24XX
Input ripple current
Units
mA p-p
OUTPUT CHARACTERISTICS
PRODUCT OVERVIEW
Parameter
The NCS1 series of DC/DC converters offers a
single output voltage from input voltage ranges
of 4.5-18V and 9-36V. The NCS1 is housed in an
industry standard package with a standard pinout.
Rated power
All output types
Minimal load to meet datasheet speciﬁcation
Voltage set point accuracy All output types
Line regulation
Low line to high line
Load regulation
All output types
Peak deviation (12.5-37.5% & 37.5-12.5% swing)
Transient response
Settling time
(within 5% Vout Nom.)
Applications include telecommunications, battery
powered systems, process control and distributed
power systems.
Conditions
Min.
Typ.
Max.
1
Units
W
±2
±0.5
0.5
5
%
%
%
%
%Vout
10
±1
2
ms
ISOLATION CHARACTERISTICS
Parameter
Conditions
Min.
Isolation test voltage
Resistance
Flash tested for 1 minute
Viso = 1kVDC
1000
1
Typ.
Max.
Units
VDC
GΩ
GENERAL CHARACTERISTICS1
Parameter
Conditions
Min.
Switching frequency
Control pin input
Typ.
100
Module on, pin unconnected or open collector ﬂoating
Module off
Max.
Units
400
kHz
0.8
V
1 Calculated using MIL-HDBK-217 FN2, parts stress method 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_NCS1.A02 Page 1 of 8
NCS1 Series
Isolated 1W 4:1 Input Single Output DC/DC Converters
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
Operation
Storage
Case temperature above ambient
Min.
Typ.
Max.
Units
°C
15
105
125
22
-40
-50
100% Load, Nom VIN, Still Air
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, NCS1 12V input types
Input voltage, NCS1 24V input types
Continuous
18V Max
260°C
25V
40V
APPLICATION NOTES
Start-up times
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.
Start-up times
ms
6
9
20
12
7
12
Part No.
NCS1S1203SC
NCS1S1205SC
NCS1S1212SC
NCS1S2403SC
NCS1S2405SC
NCS1S2412SC
Control Pin
The NCS1 converters have a shutdown feature which enables the user to put the converter into a low power state. The control pin connects directly to the base of an
internal transistor, and the switch off mechanism for the NCS1 works by forward biasing this NPN transistor. If the pin is left open (high impedance), the converter will be
ON (there is no allowed low state for this pin), but once a control voltage is applied with sufﬁcient drive current, the converter will be switched OFF. A suitable application
circuit is shown below.
D1 (e.g. 1N4003) is required to provide high impedence when the signal is low.
From the NCS1 speciﬁcation, the drive current to operate this function is recommended to be 3mA, and hence the value of R1 can be derived as follows:
NCS1
VIN
R2
VC
OV
-VIN
R1
www.murata-ps.com
D1
CTRL
Q1
R1 =
VC - VD - VQ
IC
Assuming VC=5V, VD=0.7V and VQ=1V:
R 1=
5 - 0.7 - 1.0
= 1100Ω
3 x 10-3
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KDC_NCS1.A02 Page 2 of 8
NCS1 Series
Isolated 1W 4:1 Input Single Output DC/DC Converters
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 NCS1 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1.0kVDC 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 NCS1 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 NCS1 series has a toroid 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.
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 Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The series is backward compatible with Sn/Pb soldering
systems.
CHARACTERISATION TEST METHODS
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_NCS1.A02 Page 3 of 8
NCS1 Series
Isolated 1W 4:1 Input Single Output DC/DC Converters
EFFICIENCY VS LOAD
NCS1S1203SC
NCS1S1205SC
90
80
80
70
70
60
60
40
4.5 Vin
5 Vin
12 Vin
30
18 Vin
Efficiency (%)
Efficiency (%)
50
50
4.5 Vin
40
5 Vin
12 Vin
18 Vin
30
20
20
10
10
0
0
0
10
20
30
40
50
60
70
80
90
0
100
10
20
30
40
Load (%)
50
60
70
80
90
100
Load (%)
NCS1S1212SC
NCS1S2403SC
90
90
80
80
70
70
60
Efficiency (%)
4.5 Vin
40
5 Vin
12 Vin
Efficiency (%)
60
50
18 Vin
30
50
9 Vin
12 Vin
40
24 Vin
36 Vin
30
20
20
10
10
0
0
0
10
20
30
40
50
60
70
80
90
0
100
10
20
30
40
50
60
70
80
90
100
Load (%)
Load (%)
NCS1S2405SC
NCS1S2412SC
90
90
80
80
70
70
60
9 Vin
12 Vin
40
24 Vin
36 Vin
Efficiency (%)
Efficiency (%)
60
50
50
9 Vin
12 Vin
40
24 Vin
30
30
20
20
10
10
36 Vin
0
0
0
10
20
30
40
50
Load (%)
www.murata-ps.com
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
Load (%)
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KDC_NCS1.A02 Page 4 of 8
NCS1 Series
Isolated 1W 4:1 Input Single Output DC/DC Converters
TEMPERATURE DERATING
NCS1S1203SC
NCS1S1205SC
100
100
90
95
80
90
70
85
Load (%)
Load (%)
60
50
40
80
75
30
70
20
65
10
60
0
25
75
95
25
100
85
105
Ambient Temperature OC
Ambient Temperature OC
NCS1S1212SC
NCS1S2403SC
100
100
95
90
90
85
80
80
75
70
70
65
60
Load (%)
Load (%)
60
50
40
55
50
45
40
35
30
30
25
20
20
15
10
10
5
0
25
85
95
0
105
25
Ambient Temperature OC
75
95
100
Ambient Temperature OC
NCS1S2405SC
NCS1S2412SC
100
100
95
90
90
85
80
80
75
70
70
65
60
Load (%)
Load (%)
60
55
50
45
50
40
40
35
30
30
25
20
20
15
10
10
5
0
0
25
75
Ambient Temperature OC
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105
25
85
95
105
Ambient Temperature OC
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KDC_NCS1.A02 Page 5 of 8
NCS1 Series
Isolated 1W 4:1 Input Single Output DC/DC Converters
EMC FILTERING AND SPECTRA
FILTERING
The module includes a basic level of ﬁltering, the following table shows the additional input capacitor and input inductor typically required to meet EN 55022 Curve A
Quasi-Peak EMC limit, as shown in the following plots.
Part Number
Capacitor
Inductor
NCS1S1203SC
NCS1S1205SC
NCS1S1212SC
NCS1S2403SC
NCS1S2405SC
NCS1S2412SC
330nF
330nF
2.2μF
330nF
330nF
330nF
500μH
500μH
2.2mH
500μH
500μH
500μH
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Common Mode Choke
700μH
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KDC_NCS1.A02 Page 6 of 8
NCS1 Series
Isolated 1W 4:1 Input Single Output DC/DC Converters
EMC FILTERING AND SPECTRA
80
70
60
50
40
30
20
10
0
1.00E+05
NCS1S1205SC
dBuV
dBuV
NCS1S1203SC
1.00E+06
1.00E+07
1.00E+08
80
70
60
50
40
30
20
10
0
1.00E+05
1.00E+06
1.00E+07
1.00E+08
80
70
60
50
40
30
20
10
0
1.00E+05
Frequency (Hz)
1.00E+06
1.00E+07
1.00E+08
NCS1S2412SC
dBuV
dBuV
1.00E+08
Frequency (Hz)
NCS1S2405SC
80
70
60
50
40
30
20
10
0
1.00E+05
1.00E+07
NCS1S2403SC
dBuV
dBuV
NCS1S1212SC
80
70
60
50
40
30
20
10
0
1.00E+05
1.00E+06
Frequency (Hz)
Frequency (Hz)
1.00E+06
1.00E+07
Frequency (Hz)
www.murata-ps.com
1.00E+08
80
70
60
50
40
30
20
10
0
1.00E+05
1.00E+06
1.00E+07
1.00E+08
Frequency (Hz)
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KDC_NCS1.A02 Page 7 of 8
NCS1 Series
Isolated 1W 4:1 Input Single Output DC/DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
PIN CONNECTIONS
21.87 [0.861] MAX
8.2 [0.323] MAX
Pin
Function
Single
1
2
3
6
7
-VIN
+VIN
Control
+VOUT
-VOUT
TUBE OUTLINE DIMENSIONS
0.50 (0.0197)
NCS1S1205SC
11.30 [0.445] MAX
XYYWW
12.30 (0.484)
0.40 [0.016] MIN
4.10±0.50
[0.161±0.020]
1 2 3
0.75 (0.0295)
±0.20 (0.0079)
6 7
0.50±0.05
[0.020±0.002]
2.54 [0.100]
5.00 (0.1969)
2.00 (0.0787)
2.00 (0.0787)
8.20
(0.3228)
15.24 [0.600]
All dimensions in millimetres ±0.5 (inches ±0.01).
Tube length: 520±2 (20.47 inches ±0.079).
3.52
2.87
0.25±0.05 [0
0.113 ]
[0.139
RECOMMENDED FOOTPRINT DETAILS
.010±0.002]
2.62
1.92
Quantity: 23
2.54 [0.100]
0.076 ]
[0.103
x6 HOLES
Ø 0.045
0.039
Ø 1.15
1.00
2.54 [0.100]
All dimensions in millimetres (inches) ± 0.5 (0.020) except pin to pin tolerance ±0.25 (0.010).
All pins on a 2.54 (0.100) pitch and within 0.25 (0.010) of true position.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansﬁeld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
www.murata-ps.com/support
Weight: 3.3g
[
]
0.1
All dimensions in mm (inches) ±0.25 (± 0.010).
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.
© 2014 Murata Power Solutions, Inc.
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KDC_NCS1.A02 Page 8 of 8
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有率は０．１％以下のものをご使用ください。
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お願い
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に実装された状態で必ず評価、確認をして下さい。
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