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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 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.
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
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KDC_NDTD.E05 Page 1 of 7
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 V.