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.
DESCRIPTION
The NMD series of DC-DC converters are ideally
suited to applications where a potential difference
exists between loads, e.g. motor control circuits.
The twin outputs offer cost and space savings
by consolidating two DC-DC converters into one
package. All of the rated power may be drawn
from a single output provided the total load does
not exceed 1 watt.
INPUT CHARACTERISTICS
Parameter
Voltage range
Conditions
Continuous operation, 5V input types
Min.
4.5
Typ.
5.0
Max.
5.5
Units
V
OUTPUT CHARACTERISTICS
Parameter
Rated power
Voltage set point accuracy
Line regulation
Load regulation
Ripple and noise
Conditions
T
A
=0°C to 125°C, see derating graph
See tolerance envelope
High V
IN
to Low V
IN
All output types
10% load to rated load, 5V output types
10% load to rated load, 12V output types
10% load to rated load, 15V output types
BW=DC to 20MHz, all output types
Min.
Typ.
Max.
1.0
Units
W
%/%
%
mV p-p
1.0
1.2
15
10
10
75
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
2
Lead temperature 1.5mm from case for 10 seconds
Input voltage V
IN
, NMD05 types
1 second
260°C
7V
For full details go to
www.murata-ps.com/rohs
1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2. 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.
www.murata-ps.com/support
KDC_NMD.F01
Page 1 of 4
NMD Series
Isolated 1W Twin Output DC-DC Converters
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
Viso= 500VDC
Min.
1000
1
Typ.
Max.
Units
VDC
GΩ
GENERAL CHARACTERISTICS
Parameter
Switching frequency
Conditions
All input types
Min.
Typ.
100
Max.
Units
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Cooling
Conditions
All output types
Free air convection
Min.
0
-55
Typ.
Max.
70
150
Units
ºC
TEMPERATURE DERATING GRAPH
1.5
TOLERANCE ENVELOPE
+10%
70°C
+5%
V
NOM
Output Power (W)
Typical
L
1.0
oad Line
+2.5%
-2.5%
-7.5%
0.5 Safe Operating Area
125ºC
0
0
50
100
Ambient Temperature (ºC)
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.
Murata Power Solutions NMD 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 NMD 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 NMD 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 recognised 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 260°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.murata-ps.com/rohs
www.murata-ps.com/support
KDC_NMD.F01
Page 2 of 4
NMD Series
Isolated 1W Twin Output DC-DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
DIP Package
19.50(0.77)
9.80
(0.385)
19.50
(0.77)
PIN CONNECTIONS - 14 PIN DIP
SIP Package
Pin
1
7
8
9
10
11
14
Function
-V
IN
NC
-V
OUT2
+V
OUT2
-V
OUT1
+V
OUT1
+V
IN
NMDXXXXXXDC
XYYWW
6.00
(0.236)
10.00
(0.394)
6.80
(0.268)
NMDXXXXXXSC
XYYWW
1
2
4 5 6 7
2.54 (0.1)
0.55(0.022 )
0.45 (0.0178)
4.60 (0.181)
3.60 (0.14)
0.55 (0.022)
0.45 (0.0178)
PIN CONNECTIONS - 7 PIN SIP
Pin
0.55(0.22 )
0.45 (0.0178)
0.30 (0.0118)
0.20 (0.0079)
2.54(0.1)
1.09
(0.043)
4.60 (0.181)
3.60 (0.141)
2.00
(0.079)
Function
+V
IN
-V
IN
+V
OUT1
-V
OUT1
+V
OUT2
-V
OUT2
1
7.62 (0.3)
14
2.13
(0.084)
7
11 10 9 8
15.24 (0.6)
0.30 (0.0118)
0.20 (0.0079)
1.25
(0.05)
12.70(0.5)
1
2
4
5
6
7
All dimensions in mm ±0.25mm (inches ±0.01). All pins on a 2.54 (0.1) pitch and within 0.25 (±0.01) of true position.
Weight: 2.3g (DIP & SIP)
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KDC_NMD.F01
Page 3 of 4
NMD Series
Isolated 1W Twin Output DC-DC Converters
PACKAGE SPECIFICATIONS (continued)
RECOMMENDED FOOTPRINT DETAILS
14 Pin DIP Package
1.15 (0.045)
Ø 1.00 (0.039)
7 HOLES
7 Pin SIP Package
1.15 (0.045)
Ø 1.00 (0.039)
6 HOLES
2.54 (0.1)
2.54 (0.1)
2.54 (0.1)
2.54 (0.1)
TUBE OUTLINE DIMENSIONS
14 Pin DIP Tube
12.0 [0.472]
7 Pin SIP Tube
9.3 [0.366]
12.43 [0.489]
14.5 [0.571]
18.0 [0.709]
5.07±0.80 [0.200±0.03]
5.05 [0.199]
5.0 [0.197]
Unless otherwise specified all dimensions in mm [inches] ±0.55mm [0.022].
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