converters offering a single regulated output over a
2:1 input voltage range. All parts deliver 3W output
power up to 85ºC without heatsinking, except the
4.5V to 9V input voltage range which should be
derated to 2W at the lower input voltage. A flyback
oscillator design with isolated feedback is used to
give regulation over the full operating range of 25%
to 100% of full load. It is strongly recommended
that external capacitors be used on input and
output to guarantee performance over full load and
input voltage range.
Voltage range
Reflected ripple current
2
mA p-p
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
Lead temperature 1.5mm from case for 10 seconds
Minimum load
Input voltage 05 types
Input voltage 12 types
Input voltage 24 types
Input voltage 48 types
Internal dissipation
Continuous
300°C
25% of rated load
10V
20V
40V
80V
1.7W
For full details go to
www.murata-ps.com/rohs
1. Refer to power derating graph.
2. Measured at full load with external input/output capacitors, refer to filter circuit 1.
3. Calculated using MIL-HDBK-217F with nominal input voltage at full load (ground benign) at 25°C.
All specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
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KDC_NDY.H01
Page 1 of 4
NDY Series
Isolated 3W Wide Input DC-DC Converters
OUTPUT CHARACTERISTICS
Parameter
Voltage set point accuracy
Line regulation
Load regulation
Ripple
1
Noise
1
Conditions
With external input/output capacitors
Low line to high line, 3.3V output with external input/output capacitors
Low line to high line, all other outputs with external input/output capacitors
25% load to 100% load, 3.3V output with external input/output capacitors
25% load to 100% load, all other outputs with external input/output capacitors
BW = 20Hz to 300kHz, 3.3V output with external input/output capacitors
BW = 20Hz to 300kHz, all other outputs with external input/output capacitors
BW = DC to 100MHz, 3.3V output with external input/output capacitors
BW = DC to 20MHz, all other outputs with external input/output capacitors
Min.
Typ.
±1
0.05
0.05
0.6
0.2
80
5
50
Max.
±5
0.25
0.5
1.0
0.5
120
10
180
100
Units
%
%
%
%
%
mV rms
mV p-p
GENERAL CHARACTERISTICS
Parameter
Conditions
Switching frequency
100% load V
IN
nominal 3.3V output
25% load V
IN
nominal 3.3V output
100% load V
IN
nominal, all other outputs
25% load V
IN
nominal, all other outputs
Min.
160
290
80
290
Typ.
Max.
220
560
220
560
Units
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Cooling
Conditions
Ambient temperature
Free air convection
Min.
-40
-50
Typ.
Max.
85
130
Units
ºC
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
Viso=500VDC
Min.
1000
1
Typ.
Max.
Units
VDC
GΩ
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 NDY 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?”
The NDY series has been recognized by Underwriters Laboratory for functional isolation. 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 NDY 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.
SAFETY APPROVAL
The NDY series has been recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation for a maximum case temperature limit of 130ºC (case temperature
measured on the face opposite the pins). File number E151252 applies.
Note: This series gained UL 60950 recognition for products manufactured on or after datecode G1123, any NDY parts manufactured before this date code should not be considered
UL 60950 recognized. Any NDY that is UL recognized will be printed with the UL logo.
1. For lower ripple refer to circuit for reduced ripple.
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KDC_NDY.H01
Page 2 of 4
NDY Series
Isolated 3W Wide Input DC-DC Converters
APPLICATION NOTES
Recommended input & output capacitors
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.
Input Voltage
5V, 12V
24V, 48V
C
IN
100μF, 25V (0.25Ω at 100KHz)
10μF, 100V (1.5Ω at 100KHz)
Output Voltage
3.3V
5V, 12V, 15V
C
OUT
100μF, 25V (0.25Ω at 100KHz)
L
OUT
MPS# - 24100C
Not required
Test circuit, 5V, 12V and 15V output
+ V
IN
+ V
OUT
C
IN
NDY
C
OUT
- V
IN
- V
OUT
Recommended circuit for reduced ripple 3.3V output
L
OUT
+ V
IN
+ V
OUT
C
IN
NDY
C
OUT
- V
IN
- V
OUT
Output load
The minimum rated load across the whole input voltage range is 25% of the full load output. It is important to take care that the load does not fall below this as the output ripple
will greatly increase. While this condition will not harm the device the resultant increase in output ripple could cause customers’ application to malfunction.
NDY05 POWER DERATING CURVE
5
RoHS COMPLIANCE INFORMATION
Output Power (W)
4
3
2
1
0
4.5 5
6
7
Input voltage (V)
8
9
For further information, please visit www.murata-ps.com/rohs
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 Bright Tin. The series
is backward compatible with Sn/Pb soldering
systems.
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KDC_NDY.H01
Page 3 of 4
NDY Series
Isolated 3W Wide Input DC-DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
32.26
(1.27)
PIN CONNECTIONS (TOP VIEW)
14.66
(0.577)
NDYXXXXC
XYYWW
7.00
(0.276)
5.00 (0.197)
4.00 (0.157)
0.84 (0.033)
0.54 (0.021)
27.94
(1.10)
2.54
(0.10)
RECOMMENDED FOOTPRINT DETAILS
1.45 (0.057)
Ø
1.30 (0.051)
2.54 (0.10)
0.30 (0.012)
0.20 (0.008)
16.35
(0.644) MAX
Weight: 6.2g (3.3V: 6.7g)
2.54
(0.10)
Unless otherwise stated all dimensions in mm ±0.5mm (inches ±0.01).
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.
TUBE OUTLINE DIMENSIONS
20.70±0.55 (0.815±0.022)
16.70±0.55 (0.657±0.022)
11.70±0.80 (0.461±0.031)
0.268±0.022 (6.80±0.55)
0.60±0.15 (0.024±0.006)
Unless otherwise stated all dimensions in mm ±0.5mm (inches ±0.01).
Tube length : 520mm ±2mm (20.47±0.079).
5.50±0.25 (0.217±0.010)
16.70±0.80 (0.657±0.031)
Tube Quantity : 15
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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