are ideally suited for providing dual rail supplies
on single rail boards with the added benefit of
galvanic isolation to reduce circuit noise. All of
the rated power may be drawn from a single pin
provided the total load does not exceed 2 watts.
Pin compatibility with the NMA 1 watt series
ensures minimal effort in upgrading distributed
power systems.
When operated
with
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
Conditions
Continuous operation, 5V input types
Continuous operation, 12V input types
Continuous operation, 24V input types
Continuous operation, 48V input types
5V input types
12V input types
24V input types
48V input types
MIN.
4.5
10.8
21.6
43.2
TYP.
5
12
24
48
50
70
130
200
MAX.
5.5
13.2
26.4
52.8
Units
V
Reflected ripple current
mA p-p
1. 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.
For full details go to
www.cd4power.com/rohs
www.cd4power.com
KDC_NMHC.4
Page 1 of 4
NMH SERIES
Isolated 2W Dual Output DC/DC Converters
OUTPUT CHARACTERISTICS
Parameter
Rated Power
Voltage Set Point Accuracy
1
Conditions
T
A
=-40
°C
to 85
°C
NMH0505DC/SC
All other types
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
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
MIN.
-5
-5
TYP.
MAX.
2
7.5
5
1.2
10
10
200
150
150
150
Units
W
%
%/%
%
Line regulation
Load Regulation
1.0
5
3
150
100
80
70
Ripple and Noise
mV p-p
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
2
Lead temperature 1.5mm from case for 10 seconds
Internal power dissipation
Input voltage V
IN
, NMH05 types
Input voltage V
IN,
NMH12 types
Input voltage V
IN,
NMH24 types
Input voltage V
IN,
NMH48 types
1 second
300°C
300mW
7V
15V
28V
54V
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
Viso= 500V
MIN.
1000
1
TYP.
10
MAX.
Units
VDC
GΩ
GENERAL CHARACTERISTICS
Parameter
Switching frequency
Conditions
5V input types
12V input types
24V & 48V input types
MIN.
TYP.
95
90
80
MAX.
Units
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Case Temperature above ambient
Cooling
Conditions
All output types
5V output types
12V output types
Free air convection
MIN.
-40
-50
TYP.
MAX.
85
130
Units
°C
30
25
TEMPERATURE DERATING GRAPH
3
TOLERANCE ENVELOPE
+10%
+5%
V
NOM
Typical
L
Output Power (W)
Output Voltage
2
1
0
-40
85°C
oad Line
+2.5%
-2.5%
-7.5%
Safe Operating Area
100
50
0
Ambient Temperature (°C)
150
10
75
50
25
Output Load Current (%)
100
1. See derating graph.
2. Supply voltage must be discontinued at the end of the short circuit duration.
www.cd4power.com
KDC_NMHC.4
Page 2 of 4
NMH SERIES
Isolated 2W Dual 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 specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
C&D Technologies NMH 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 NMH 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 NMH 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.
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
PIN CONNECTIONS - 14 PIN DIP
DIP package
½½½½½½½½½½½½
SIP package
½½½½
½½½½½½½
Pin
1
7
8
9
11
14
½½½½½½½½½½½½½
½½½½½½½½½½½½½
Function
-V
IN
NC
OV
+V
OUT
-V
OUT
+V
IN
½½½½
½½½½½½
½½½½½½½½½
½½½½½½
½½½½½
½½½½½½
½½½½½
½½½½½½
½½½½
½½½½½½½
½½½½½½½½½
½½½½½½
PIN CONNECTIONS - 7 PIN SIP
Pin
1
½½½½½½½½½½½½
½½½½½½½½½½½½
½½½½½½½½½½½½
½½½½½½½½½½½½½
½
½
½ ½ ½
½½½½½½½½½½
½½½½½½½½½½½½
½½½½½½½½½½½½
½½½½½
½½½½½½
½½½½½½½½½½
½½½½½½½½½½½½½
½½½½½½½½½½½½½
Function
+V
IN
-V
IN
-V
OUT
OV
+V
OUT
½½½½½½
½½½½½½
½
½
½½
½ ½
2
4
5
6
½½½½½½½½½½
½½
½½½½½½½½½½½½½½
½½½½½½½½½½½½½
½½½½½½½½½½½½½½
½½½½½½½½½½½½½
½½½½
½½½½½½
½½½½½½½½½½½
½½½½½½
½½½½½½
½½½½½½½½½½½
Weight: 2.85g (DIP) 2.76g (SIP)
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.
www.cd4power.com
KDC_NMHC.4
Page 3 of 4
NMH SERIES
Isolated 2W Dual Output DC/DC Converters
PACKAGE SPECIFICATIONS (continued)
RECOMMENDED FOOTPRINT DETAILS
14 Pin DIP Package
½½½½½½½½½½½½
½
½½½½½½½½½½½½
½½½½½½½
½½½½½½½½½½½½½
7 Pin SIP Package
½½½½½½½½½½½½
½ ½½½½½½½½½½½½
½½½½½½½
½½½½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½½
TUBE OUTLINE DIMENSIONS
14 Pin DIP Tube
½½½½½½½½½½½½½
7 Pin SIP Tube
½½½½½½½½½½½½½
½½½½½½½½½½½½½
½½½½½½½½½½½½½½
½½½½½½½½½½½½½
½½½½½½½½½½½
Tube Quantity : 25
½½½½½½½½½½½½
½½½½½½½½½½½½
½½½½½½½½½½½½½
Unless otherwise stated all dimensions in inches (mm) ±0.5mm.
Tube length (14 Pin DIP) : 20.47 (520mm ±2mm).
Tube length (7 Pin SIP) : 20.47 (520mm ±2mm).
RoHS COMPLIANT 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
½½½½½½½½½½½½
C&D Technologies (NCL) Limited reserve the right to alter or improve the specification, internal design or manufacturing
process at any time, without notice. Please check with your supplier or visit our web site to ensure that you have the
current and complete specification for your product before use.
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