Isolated 2W Wide Input Single Output DC/DC Converters
SELECTION GUIDE
Input
Voltage
V (nom.)
NDL0505SC
NDL0509SC
NDL0512SC
NDL0515SC
NDL1205SC
NDL1209SC
NDL1212SC
NDL1215SC
NDL2405SC
NDL2409SC
NDL2412SC
NDL2415SC
NDL4805SC
NDL4809SC
NDL4812SC
NDL4815SC
5
5
5
5
12
12
12
12
24
24
24
24
48
48
48
48
Order Code
Rated Output
Voltage
V
5
9
12
15
5
9
12
15
5
9
12
15
5
9
12
15
Output Current
1
Min Load
mA
100
55
42
33
100
55
42
33
100
55
42
33
100
55
42
33
3
Input Current
2
Full Load
mA
606
558
559
549
228
211
208
206
112
102
100
100
57
52
51
51
Isolation
Capacitance
pF
26
27
26
27
39
38
47
47
37
40
51
58
39
40
53
65
Efficiency
MTTF
4
kHrs
2015
1998
1980
1965
1994
1981
1961
1947
1722
1711
1696
1685
1719
1709
1694
1683
Full Load
mA
400
222
167
134
400
222
167
134
400
222
167
134
400
222
167
134
%
66
71
71
73
73
79
80
81
74
81
83
83
73
80
81
82
FEATURES
RoHS compliant
2:1 wide range voltage input
Continuous short circuit protection with
current foldback
Operating temperature range -40ºC to 85ºC
0.75% regulation
1kVDC Isolation
Efficiency to 83%
Power density 0.9W/cm
3
5V, 12V, 24V & 48V nominal input
5V, 9V, 12V & 15V output
No electrolytic capacitors
Fully encapsulated
External control
Low noise
Fully encapsulated
INPUT CHARACTERISTICS
Parameter
Voltage range
Conditions
All NDL05 types
All NDL12 types
All NDL24 types
All NDL48 types
All NDL05 types with 100μF at input
All NDL12 types with 100μF at input
All NDL24 types with 10μF at input
All NDL48 types with 10μF at input
Min.
4.5
9
18
36
Typ.
5
12
24
48
Max.
9
18
36
72
250
150
380
170
Units
VDC
Reflected ripple
current
300
140
mA p-p
ABSOLUTE MAXIMUM RATINGS
DESCRIPTION
The NDL series is a range of high performance
miniature DC/DC converters having regulated out-
puts over the wide temperature range of -40ºC to
85ºC. The input voltage range is 2:1 with the output
power at 2 watts and the input to output isola-
tion is 1kVDC. Continuous short circuit protection,
external control and extremely small SIP packaging
provide state of the art functionality. Nominal input
voltages of 5, 12, 24 and 48V with output voltages
of 5,9,12 and 15V are available as standard with
custom parts on request. The plastic case is rated
to UL94V-0 with encapsulant to UL94V-1.
Short-circuit protection
Lead temperature 1.5mm from case for 10 seconds
Control pin input current
Input voltage 05 types
Input voltage 12 types
Input voltage 24 types
Input voltage 48 types
Continuous
300°C
15mA
10V
20V
40V
80V
1. Refer to power derating graph for operating of 5V input types at 4.5 to 6V.
2. Measured at full load with external input/output capacitors.
3. Please refer to minimum load application notes section on page 3.
4. 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.murata-ps.com/rohs
www.murata-ps.com/support
KDC_NDL.F05
Page 1 of 4
NDL Series
Isolated 2W Wide Input Single Output DC/DC Converters
OUTPUT CHARACTERISTICS
Parameter
Voltage set point accuracy
Line regulation
Load regulation
Ripple
Noise
Shutdown power
Conditions
1
All NDL05/12 input types with external input/output capacitors
All NDL24/48 input types with external input/output capacitors
All NDL05/12 input types, low line to high line with external input/output capacitors
All NDL24/48 input types, low line to high line with external input/output capacitors
All NDL05/12 input types, minimum load to rated load with external input/output capacitors
All NDL24/48 input types, minimum load to rated load with external input/output capacitors
B/W = 20MHz to 300kHz with external input/output capacitors
All NDL05 input types, B/W =DC to 20MHz with external input/output capacitors
All NDL12 input types, B/W =DC to 20MHz with external input/output capacitors
All NDL24/48 input types, B/W =DC to 20MHz with external input/output capacitors
+V
IN
nominal
Typ.
±1
±2
0.05
0.04
0.2
0.2
5
50
110
50
2.8
Max.
±3
±5
0.5
0.4
0.75
0.75
10
100
170
100
Units
%
%
%
mV rms
mV p-p
mW
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
V
ISO
= 1000V
DC
Min.
1000
1
Typ.
Max.
Units
V
DC
GΩ
GENERAL CHARACTERISTICS
Parameter
Control pin (CTRL) input current
Switching frequency
Conditions
Please refer to control pin application note
Max. rated load to Min. rated load, V
IN
Min. to V
IN
. Max.
Min.
6
100
Typ.
10
Max.
15
600
Units
mA
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Cooling
Conditions
Min.
-40
-50
Typ.
Max.
85
130
Units
ºC
Free air convection
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 NDL 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 NDL 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 NDL series has an EI 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 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.
1. Refer to recommended test circuit for external input/output capacitors.
www.murata-ps.com/support
KDC_NDL.F05
Page 2 of 4
NDL Series
Isolated 2W Wide Input Single Output DC/DC Converters
APPLICATION NOTES
External capacitance
Although these converters will work without external capacitors, they are necessary
in order to guarantee the full parametric performance over the full line and load
range. All parts have been tested and characterized using the following values and
test circuit.
Test circuit
+ V
OUT
Supply + V
IN
+ V
IN
Value
Input Voltage (V)
5 & 12
24 & 48
C
IN
100μF, 25V
10μF, 200V
C
OUT
100μF, 25V
100μF, 25V
C
IN
Supply - V
IN
- V
IN
NDL
C
OUT
- V
OUT
Control Pin
The NDL 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 NDL 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.
D
1
(e.g. 1N4001) is required to provide high impedence when the signal is
low. From the NDL specification, the drive current to operate this function
NDL
V
IN
is recommended to be 10mA, and hence the value of R
1
can be derived as
follows:
R
2
V -V -V
R
1
V
C
D
1
R
1
=
C D Q
CTRL
I
C
Q
1
OV
-V
IN
Assuming V
C
=5V, V
D
=0.7V and V
Q
=1V:
R
1
= 5 - 0.7 - 1.0 = 330Ω
10 x 10
-3
Pin 8 (C
S
)
This pin provides a connection point to the main reservoir capacitor. Additional capacitance can be added from this pin to pin 7. Any lower ESR capacitor will remove ripple
and noise to some degree. The benefit of this access point over simple additional output capacitance is that it precedes the output filter inductor. Maximum values of external
capacitance will be dependent on the output voltage, the loading of the converter and the desired ripple figure. Values can be up to 100μF.
Minimum load
The minimum load for correct operation is 25% of the full rated load across the specified input voltage range. Lower loads may cause a significant increase in output ripple
and may cause the output voltage to exceed its specification transiently during power-down when the input voltage also falls below its rated minimum.
RoHS COMPLIANT INFORMATION
NDL05 POWER DERATING CURVE
2.5
This series is compatible with RoHS soldering
systems with a peak wave solder temperature of
300ºC 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.
Output Power (W)
2.0
1.75
1.5
1.0
0.5
0
4.5 5
6
7
Isolation voltage (V)
8
9
For further information, please visit www.murata-ps.com/rohs
www.murata-ps.com/support
KDC_NDL.F05
Page 3 of 4
NDL Series
Isolated 2W Wide Input Single Output DC/DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
0.858
(21.80)
PIN CONNECTIONS
Pin
1
2
3
5*
6
7
8
Function
-V
IN
+V
IN
CTRL
IC
+V
OUT
-V
OUT
C
S
0.362
(9.20)
0.437
(11.10)
1 2
0.181 (4.60)
0.142 (3.60)
NDL4805SC
XYYWW
3
5
6
7
8
0.022 (0.55)
0.0178 (0.45)
* This pin is internally connected, and must have no external
connection and is used for mechanical reasons. External
connection to anything will result in converter failure.
0.1 (2.54)
0.022 (0.55)
0.0178 (0.45)
0.0118 (0.30)
0.0079 (0.20)
RECOMMENDED FOOTPRINT DETAILS
0.126 (3.20)
0.079±0.02
(2.01±0.50)
Weight: 5.0g
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.
All dimensions in inches ±0.01 (mm ±0.5mm).
TUBE OUTLINE DIMENSIONS
All dimensions in inches ±0.01 (mm ±0.5mm).
Tube length : 20.47±0.079 (520mm ±2mm).
Tube Quantity : 23
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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
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Embedded System
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