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Murata Manufacturing Electronic Components Datasheet

NDTD2403C Datasheet

Isolated 3W Wide Input Dual Output DC/DC Converters

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NDTD2403C pdf
www.murata-ps.com
NDTD Series
Isolated 3W Wide Input Dual Output DC/DC Converters
FEATURES
„RoHS compliant
„Industry standard footprint
„Power density 0.90W/cm3
„2:1 Input range, 3W output power, minimum
3:1 input range with power derating to 2W
„Dual isolated output
„Short circuit protection
„Operating temperature range -40ºC to 85ºC
„Load and line regulation <1% on both
outputs
„No heatsink required
„1kVDC isolation
„5V, 12V, 24V & 48V Input
„3.3V, 5V, 12V & 15V Output
„Internal SMD construction
„Fully encapsulated
DESCRIPTION
The NDTD series is a range of low profile DC/DC
converters offering dual outputs over a 2:1 input
voltage range. All parts deliver 3W output power
up to 85ºC without heatsinking. A flyback oscilla-
tor 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 (see application notes for guidance).
The plastic case is rated to UL94V-0 and encap-
sulant to UL94V-1 and the connection pins are
formed from a tin plated alloy 42 leadframe.
SELECTION GUIDE
Order code
Input Rated output
Output current
voltage voltage Min. Load 1 Full load
NDTD0503C
NDTD0505C
NDTD0512C
NDTD0515C
NDTD1203C
NDTD1205C
NDTD1212C
NDTD1215C
NDTD2403C
NDTD2405C
NDTD2412C
NDTD2415C
NDTD4803C
NDTD4805C
NDTD4812C
NDTD4815C
V (Nom.)
5
5
5
5
12
12
12
12
24
24
24
24
48
48
48
48
V
±3.3
±5
±12
±15
±3.3
±5
±12
±15
±3.3
±5
±12
±15
±3.3
±5
±12
±15
mA
±113
±75
±31
±25
±113
±75
±31
±25
±113
±75
±31
±25
±113
±75
±31
±25
mA
±454
±300
±125
±100
±454
±300
±125
±100
±454
±300
±125
±100
±454
±300
±125
±100
Input
current
full load
Efficiency 2
(Min.)
Isolation
capacitance
MTTF 3
mA %
pF kHrs
890 67
30 1644
804 72
31 1640
764 76
36 1625
773 75
34 1609
343 73
30 1668
321 75
29 1665
311 78
32 1650
310 78
36 1633
170 73
30 1671
156 78
30 1675
148 82
35 2075
146 82
41 2080
86 72
30 1667
79 76
30 1669
76 80
35 2090
75 81
36 2045
INPUT CHARACTERISTICS
Parameter
Conditions
5V input types
Voltage range
12V input types
24V input types
48V input types
5V input types
Reflected ripple current 4
12V, 24V & 48V input types
Min. Typ. Max. Units
4.5 5
9
9 12 18
VDC
18 24 36
36 48 75
40 90
mA p-p
30 40
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
Lead temperature 1.5mm from case for 10 seconds
Minimum output load for specification1
Input voltage 5V types
Input voltage 12V types
Input voltage 24V types
Input voltage 48V types
Free air space
8 hours
300°C
25% of rated output
10V
20V
40V
80V
10mm Min. around component
1. Please refer to minimum load application note section on page 4.
2. Measured at full load with external input/output capacitors, refer to test circuit.
3. Calculated using MIL-HDBK-217F with nominal input voltage at full load (ground benign) at 25°C.
4. Please refer to reflected ripple current measurement circuit on page 3.
All specifications typical at TA=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_NDTD.E05 Page 1 of 7


Murata Manufacturing Electronic Components Datasheet

NDTD2403C Datasheet

Isolated 3W Wide Input Dual Output DC/DC Converters

No Preview Available !

NDTD2403C pdf
NDTD Series
Isolated 3W Wide Input Dual Output DC/DC Converters
OUTPUT CHARACTERISTICS
Parameter
Conditions
Voltage set point accuracy
With external input/output capacitors
3.3V & 5V outputs
12V & 15V outputs
Line regulation
Low line to high line with external input/output capacitors
Load regulation
Ripple
Ripple & noise
Cross regulation
Short circuit protection
25% load to 100% load with external input/output 3.3V & 5V outputs
capacitors with balanced load
12V & 15V outputs
BW = 20Hz to 300kHz with external input/output capacitors
BW = DC to 20MHz with external input/output capacitors
% voltage change on negative output when
positive load varies from 12% to 50% of 3W rating,
with negative load fixed at 50%
NDTD05XXC, NDTD1203C,
NDTD1205C, NDTD2403C,
NDTD2405C, NDTD4803C,
NDTD4805C
NDTD1212C, NDTD1215C,
NDTD2412C, NDTD2415C,
NDTD4812C, NDTD4815C
Min. Typ. Max. Units
±2 ±5
%
±1 ±3
0.15 0.5
%
0.5 1.0
%
0.2 0.5
%
15 40 mV rms
90 150 mV p-p
5.0
2.1 3.0
Continuous
%
GENERAL CHARACTERISTICS
Parameter
Conditions
Switching frequency
100% to 25% load, VIN min to max
Min. Typ. Max. Units
60 620 kHz
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
Operation
Storage
NDTD0503
Case temperature rise above
ambient in still air
NDTD1203C, NDTD2403C, NDTD4803C
NDTD0505C, NDTD0512C, NDTD1205C, NDTD2405C, NDTD4805C
NDTD0515C, NDTD1212C, NDTD1215C, NDTD2412C, NDTD4812C, NDTD2415C,
NDTD4815C
Min. Typ. Max. Units
-40 85
-50 130
54
40 ºC
35
28
ISOLATION CHARACTERISTICS
Parameter
Conditions
Isolation voltage
Flash tested for 1 second
Resistance
Viso=1KVDC
Min. Typ. Max. Units
1000 VDC
1 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 NDTD 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 NDTD 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 NDTD 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.
www.murata-ps.com/support
KDC_NDTD.E05 Page 2 of 7


Part Number NDTD2403C
Description Isolated 3W Wide Input Dual Output DC/DC Converters
Maker muRata
Total Page 7 Pages
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