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NDTD Series
Isolated 3W Wide Input Dual Output DC/DC Converters
SELECTION GUIDE
Order code
NDTD0503C NDTD0505C NDTD0512C NDTD0515C NDTD1203C NDTD1205C NDTD1212C NDTD1215C NDTD2403C NDTD2405C NDTD2412C NDTD2415C NDTD4803C NDTD4805C NDTD4812C NDTD4815C
Input voltage V (Nom.)
5 5 5 5 12 12 12 12 24 24 24 24 48 48 48 48
Output current Rated output voltage Min. Load 1 Full load 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 Efficiency 2 Isolation current MTTF 3 (Min.) capacitance full load mA % pF kHrs
890 804 764 773 343 321 311 310 170 156 148 146 86 79 76 75 67 72 76 75 73 75 78 78 73 78 82 82 72 76 80 81 30 31 36 34 30 29 32 36 30 30 35 41 30 30 35 36 1644 1640 1625 1609 1668 1665 1650 1633 1671 1675 2075 2080 1667 1669 2090 2045
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 -40C to 85C 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
INPUT CHARACTERISTICS
Parameter
Voltage range
Conditions
5V input types 12V input types 24V input types 48V input types 5V input types 12V, 24V & 48V input types
Min.
4.5 9 18 36
Typ.
5 12 24 48 40 30
Max.
9 18 36 75 90 40
Units
VDC
Reflected ripple current 4
mA p-p
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 300C 25% of rated output 10V 20V 40V 80V 10mm Min. around component
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 85C without heatsinking. 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 (see application notes for guidance). The plastic case is rated to UL94V-0 and encapsulant to UL94V-1 and the connection pins are formed from a tin plated alloy 42 leadframe.
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 25C. 4. Please refer to reflected ripple current measurement circuit on page 3. All specifications typical at TA=25C, nominal input voltage and rated output current unless otherwise specified.
For full details go to www.murata-ps.com/rohs
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Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
KDC_NDTD_E03 Page 1 of 7
NDTD Series
Isolated 3W Wide Input Dual Output DC/DC Converters
OUTPUT CHARACTERISTICS
Parameter
Voltage set point accuracy Line regulation Load regulation Ripple Ripple & noise
Conditions
With external input/output capacitors 3.3V & 5V outputs 12V & 15V outputs
Min.
Typ.
2 1 0.15 0.5 0.2 15 90
Max.
5 3 0.5 1.0 0.5 40 150
Units
% % % % mV rms mV p-p
Low line to high line with external input/output capacitors 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 NDTD05XXC, NDTD1203C, NDTD1205C, NDTD2403C, NDTD2405C, NDTD4803C, NDTD4805C NDTD1212C, NDTD1215C, NDTD2412C, NDTD2415C, NDTD4812C, NDTD4815C
Cross regulation
% voltage change on negative output when positive load varies from 12% to 50% of 3W rating, with negative load fixed at 50%
5.0 % 2.1 3.0
Short circuit protection
Continuous
GENERAL CHARACTERISTICS Parameter Conditions
Switching frequency 100% to 25% load, VIN min to max
Min.
60
Typ.
Max.
620
Units
kHz
TEMPERATURE CHARACTERISTICS Parameter Conditions
Operation Storage NDTD0503 NDTD1203C, NDTD2403C, NDTD4803C NDTD0505C, NDTD0512C, NDTD1205C, NDTD2405C, NDTD4805C NDTD0515C, NDTD1212C, NDTD1215C, NDTD2412C, NDTD4812C, NDTD2415C, NDTD4815C
Min.
-40 -50
Typ.
Max.
85 130
Units
Case temperature rise above ambient in still air
54 40 35 28
C
ISOLATION CHARACTERISTICS
Parameter
Isolation voltage Resistance
Conditions
Flash tested for 1 second Viso=1KVDC
Min.
1000 1
Typ.
Max.
Units
VDC G
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
Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
KDC_NDTD_E03 Page 2 of 7
NDTD Series
Isolated 3W Wide Input Dual Output DC/DC Converters
TERMINOLOGY
LINE REGULATION The percentage change in output voltage between low intput voltage and high intput voltage, measured with fixed output load i.e. a 5V part with an output voltage of 5.05V @ high input voltage and 5.03V @ low input voltage would have a line regulation of 0.4%. Line regulation = VOUT (Low Input V) - VOUT (High Input V) VOUT (Nominal Input V) Where VOUT (Nominal Input V) is 5V. x100%
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 CIN 100F, 25V (0.25 at 100kHz) 10F, 100V (1.5 at 100kHz) Output Voltage 3.3V, 5V 12V, 15V COUT 100F, 25V (0.25 at 100kHz) 47F, 25V (0.4 at 100kHz)
Test circuit
+ VOUT Supply + VIN + VIN COUT
CIN
Supply - VIN - VIN
NDTD
OV COUT
- VOUT
Reflected Ripple Current Measurement
12H Supply +VIN
Current Probe
+VIN
+VOUT COUT Load
C1
CIN
NDTD
OV COUT Load
Supply -VIN C1 = 220F, ESR < 0.1 at 100kHz
-VIN
-VOUT
Cross Regulation
Load regulation is at its best when the positive and negative loads are balanced. When the loads are asymmetric, the negative output is not as tightly regulated as the positive output. To meet ripple specification a total minimum load of 25% full load is required, however, the NDTD can be used with much lighter loading at the expense of increased ripple. A small load is required on the negative output of 150mW to ensure the maximum negative output voltage is not exceeded.
www.murata-ps.com
Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
KDC_NDTD_E03 Page 3 of 7
NDTD Series
Isolated 3W Wide Input Dual Output DC/DC Converters
APPLICATION NOTES (continued)
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. The following graphs show the typical required minimum load required for stable operation in mA verses input voltage. Some variants are not included as they do not typically require a minimum load for stable operation: NDTD0512C, NDTD0515C, NDTD1212C, and NDTD1215C.
NDTD05XXC
45 40 35 0503 30 Minimum Load (mA) 25 20 15 10 5 0 6 7 Input Voltage (V) 8 9 0505
NDTD12XXC
50 45 40 35 Minimum Load (mA) 30 25 20 15 10 5 0 6 8 10 12 Input Voltage (V) 14 16 18 1205
1203
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KDC_NDTD_E03 Page 4 of 7
NDTD Series
Isolated 3W Wide Input Dual Output DC/DC Converters
APPLICATION NOTES (continued) NDTD24XXC
70
60
50 Minimum Load (mA)
40 2403 30
20
2405 2415
10 2412 0 11 12 16 20 24 Input Voltage (V) 28 32 36
NDTD48XXC
45 40 35 4803 30 Minimum Load (mA) 25 4805 20 15 10 5 0 32 40 48 Input Voltage (V) 56 64 72 4812 4815
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Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
KDC_NDTD_E03 Page 5 of 7
NDTD Series
Isolated 3W Wide Input Dual Output DC/DC Converters
APPLICATION NOTES (continued)
NDTD Power Derating
The NDTD series will operate from a wider input range than specified in the input characteristics datasheet table with output power derating.
NDTD05XXC 5
Output Power (W)
NDTD12XXC 5
Output Power (W)
4 3 2 1 0 3 4.5 Input voltage (V) 9
4 3 2 1 0 5 9 Input voltage (V) 18
NDTD24XXC 5
Output Power (W)
NDTD48XXC 5
Output Power (W)
4 3 2 1 0 11 18 Input voltage (V) 36
4 3 2 1 0 20 36 Input voltage (V) 75
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300C for 10 seconds. The pin termination finish on this product series is Tin. The series is backward compatible with Sn/Pb soldering systems. For further information, please visit www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
KDC_NDTD_E03 Page 6 of 7
NDTD Series
Isolated 3W Wide Input Dual Output DC/DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
1.270 (32.26)
PIN CONNECTIONS Pin
2 3 9 11 14 16 22 23
Function
-VIN -VIN OV -VOUT +VOUT OV +VIN +VIN
NDTD2412C
XYYWW
0.577 (14.66)
0.100 (2.54)
0.200 (5.08)
0.27 (7.00)
0.185 (4.70) 0.145 (3.70)
RECOMMENDED FOOTPRINT DETAILS
0.029 (0.73) 0.025 (0.63) 0.185 (4.70) 0.900 (22.86)
0.012 (0.30) 0.008 (0.20) 0.600 (15.25) MAX
Weight: 6.0g 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 0.25mm). All pins on a 0.1 (2.54) pitch and within 0.01 (0.25) of true position.
TUBE OUTLINE DIMENSIONS
All dimensions in inches 0.01 (mm) 0.5mm. Tube length : 20.470.079 (520mm 2mm).
Tube Quantity : 15
USA: Canada: UK:
Mansfield (MA), Tel: (508) 339 3000, email: sales@murata-ps.com Toronto, Tel: (866) 740 1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 & ISO 14001 REGISTERED
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 notice. (c) 2008 Murata Power Solutions, Inc.
France: Japan: China:
Germany: Munchen, Tel: +49 (0)89-544334-0, email: ped.munich@murata-ps.com
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
www.murata-ps.com
Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
KDC_NDTD_E03 Page 7 of 7

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