additional external load capacitance the rise time of the input voltage will determine the maximum external
capacitance value for guaranteed start up. The slower the rise time of the input voltage the greater the maximum value of the
additional external capacitance for reliable start up.
INPUT CHARACTERISTICS
Parameter
Voltage range
Reflected ripple current
Conditions
Continuous operation, 5V input types
Continuous operation, 12V input types
Min.
4.5
10.8
Typ.
5.0
12.0
26
Max.
5.5
13.2
48
Units
V
mA p-p
OUTPUT CHARACTERISTICS
Parameter
Rated Power
Voltage Set Point Accuracy
Line regulation
2
Conditions
T
A
=-40°C to 120°C
See tolerance envelope
High V
IN
to low V
IN
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
10% load to rated load, 24V output types
BW=DC to 20MHz, 5V output types
BW=DC to 20MHz, 9V output types
BW=DC to 20MHz, 12V output types
BW=DC to 20MHz, 15V output types
BW=DC to 20MHz, 24V output types
Min.
Typ.
Max.
1.0
Units
W
%/%
DESCRIPTION
The NME series of DC/DC Converters is particular-
ly 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 1 watt output at 85°C. For lower ripple,
refer to output ripple reduction section.
Load Regulation
2
Ripple and Noise
1.0
14
9
7.5
7.0
5.5
85
60
50
40
140
1.2
15
10
9.5
8.5
7.5
110
75
65
55
180
%
mV p-p
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
3
Lead temperature 1.5mm from case for 10 seconds
Internal power dissipation
Input voltage V
IN
, NME05 types
Input voltage V
IN
, NME12 types
1 second
300°C
450mW
7V
15V
1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2. See derating curve.
3. Supply voltage must be disconnected at the end of the short circuit duration.
All specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
For full details go to
www.cd4power.com/rohs
D C / D C
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email: mk@cdtechno.com, tel:
+44 (0)1908 615232
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KDC_NMEC.E02
Page 1 of 5
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POWER ELECTRONICS DIVISION
NME 5V & 12V SERIES
Isolated 1W Single Output DC/DC Converters
Min.
1000
10
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
Viso= 1000VDC
Typ.
Max.
Units
VDC
GΩ
GENERAL CHARACTERISTICS
Parameter
Switching frequency
Conditions
5V input types
12V input types
Min.
Typ.
110
145
Max.
Units
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Case Temperature above ambient
Cooling
Conditions
All output types
5V output types
All other output types
Free air convection
Min.
-40
-50
Typ.
Max.
85
130
41
32
Units
°C
TEMPERATURE DERATING GRAPH
1.5
TOLERANCE ENVELOPE
+10%
85°C
+5%
V
NOM
Output Power (W)
Typical
L
1.0
0.5
0
-40
oad Line
+2.5%
-2.5%
-7.5%
Safe Operating Area
120°C
100
50
0
Ambient Temperature (°C)
150
Output Voltage
10
75
50
25
Output Load Current (%)
100
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.
C&D Technologies NME 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 NME 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 NME 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.
D C / D C
C O N V E R T E R S
KDC_NMEC.E02
Page 2 of 5
www.cd4power.com
Technical enquiries
email: mk@cdtechno.com, tel:
+44 (0)1908 615232
POWER ELECTRONICS DIVISION
NME 5V & 12V SERIES
Isolated 1W Single Output DC/DC Converters
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: Ceramic chip capacitors are recommended. It is required that the ESR (Equivalent Series Resistance) should be as low as possible, X7R 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
Power
Source
DC
DC
Inductor
Through Hole
22R103C
22R473C
22R683C
22R104C
C
Load
5V output types
9V output types
12V output types
15V output types
L, µH
10
47
68
100
SMD
82103C
82473C
82683C
82104C
C, µF
4.70
1.00
0.47
0.47
Capacitor
Size
1206
1206
0805
0805
V rating, V
10
25
25
25
SMD option 8200 Inductor Series Mechanical Dimensions
2.0 (0.080)
±0.3 (0.012)
2.5 (0.098)
±0.2 (0.008)
Through hole option 2200R Inductor Series Mechanical Dimensions
0.283±0.020
(7.2±0.50)
3.81 (0.15)
1.52
(0.060)
332C
3.2 (0.126)
±0.3 (0.012)
2.5 (0.0984)
±0.2 (0.008)
0.7
(0.028)
Min.
103C
3.05 (0.120)
0.335±0.020
(8.5±0.50)
Recommended pad layout
1.75 (0.069)
Direction of unreeling
3.81 (0.15)
1.52
(0.060)
1.5
(0.0
4.0
(0.157)
5.50
(0.217)
12.0 (0.472)
1.614±0.130
(41.00±3.30)
59)
332
C
332
C
332
C
0.413 (10.50) Max.
3.05 (0.120)
0.6 (0.024)
2.4 (0.095)
0.024±0.002
(0.60±0.05)
Recommended footprint
Ø0.047
+0.006
+0.15
Ø1.20
-0.000
-0.00
4)
95)
All dimensions in inches (mm).
All dimensions in inches (mm).
0.118(3.00)
For more information please visit www.cd4power.com
D C / D C
C O N V E R T E R S
KDC_NMEC.E02
Page 3 of 5
www.cd4power.com
Technical enquiries
email: mk@cdtechno.com, tel:
+44 (0)1908 615232
1.772±0.130
(45.00±3.30)
POWER ELECTRONICS DIVISION
NME 5V & 12V SERIES
Isolated 1W Single Output DC/DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
DIP Package
SIP Package
PIN CONNECTIONS - 8 PIN DIP
Pin
1
4
5
7
Function
-V
IN
+V
IN
+V
OUT
-V
OUT
PIN CONNECTIONS - 4 PIN SIP
Pin
1
2
3
4
Function
-V
IN
+V
IN
-V
OUT
+V
OUT
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: 1.30g (SIP) 1.48g (DIP)
D C / D C
C O N V E R T E R S
KDC_NMEC.E02
Page 4 of 5
www.cd4power.com
Technical enquiries
email: mk@cdtechno.com, tel:
+44 (0)1908 615232
POWER ELECTRONICS DIVISION
NME 5V & 12V SERIES
Isolated 1W Single Output DC/DC Converters
PACKAGE SPECIFICATIONS (continued)
RECOMMENDED FOOTPRINT DETAILS
8 Pin DIP Package
4 Pin SIP Package
TUBE OUTLINE DIMENSIONS
8 Pin DIP Tube
4 Pin SIP Tube
Unless otherwise stated all dimensions in inches (mm) ±0.5mm.
Tube length (8 Pin DIP) : 20.47 (520mm ±2mm).
Tube length (4 Pin SIP) : 20.47 (520mm ±2mm).
Tube Quantity : 35
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300°C for 10 seconds. The pin
termination finish on the SIP package type is Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The DIP types are Matte
Tin over Nickel Preplate. Both types in this series are backward compatible with Sn/Pb soldering systems.
For further information, please visit www.cd4power.com/rohs
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