NDT SERIES
Isolated 3W Wide Input Dual Output DC-DC Converters
1
SELECTION GUIDE
Input
Nominal Rated
Input Output
Output Current
Current
3
4
Voltage Voltage Min Load
Full Load
(mA)
Full Load
(mA)
156
155
77
MTTF
Order Code
NDTD2412
NDTD2415
NDTD4812
NDTD4815
(V)
24
24
48
48
(V)
12
15
12
15
(mA)
31
(%)
79
80
81
81
(pF)
30
30
30
kHrs
2075
2080
2090
125
25
100
31
125
25
100
77
30 2045
1
INPUT CHARACTERISTICS
FEATURES
■ Industry Standard Footprint
■ 1kVDC Isolation
■ Dual Isolated Output
■ Short Circuit Protection
■ Low Profile 24 Pin Case
■ Efficiency to 81%
■ Power Density 0.90W/cm
■ 2:1 Wide Input Range
■ 24V & 48V Input
■ 12V & 15V Output
■ Footprint 4.73cm
Parameter
Conditions
MIN
18
36
TYP
24
48
200
125
MAX
Units
24V input types
48V input types
24V input types with 10µF at input
48V input types with 10µF at input
36
75
250
150
Voltage Range
VDC
Reflected Ripple
Current
mA p-p
1
OUTPUT CHARACTERISTICS
Parameter
Rated Power
Voltage Set
Conditions
MIN
TYP
MAX
3
Units
W
3
With external input/output capacitors,
1
5
%
Point Accuracy refer to recommended test circuit
Low line to high line,
Line Regulation with external input/output capacitors,
refer to recommended test circuit
25% load to 100% load,
Load Regulation with external input/output capacitors,
refer to recommended test circuit
0.15
0.5
%
2
0.2
15
0.5
30
%
■ UL 94V-0 Package Materials
BW = 20Hz to 300kHz
Ripple
With external input/output capacitors,
refer to recommended test circuit
mV rms
mV p-p
%
■ Operating Temperature Range
–40°C to 85°C
BW = DC to 20MHz
■ Load and Line Regulation
Ripple & Noise With external input/output capacitors,
refer to recommended test circuit
90
150
3.0
<1% on Both Outputs
% voltage change on negative output
Cross
■ No Heatsink Required
■ Internal SMD Construction
■ Fully Encapsulated
when positive load varies from 12% to
Regulation
2.1
50% with negative load fixed at 50%
ABSOLUTE MAXIMUM RATINGS
Short circuit protection over temperature range and input voltage range continuous
■ Custom Solutions Available
Input Voltage, 24V types
40V
Input Voltage, 48V types
Lead temperature 1.5mm from case for 10 seconds
Minimum Load
80V
300°C
25% of rated output
DESCRIPTION
The NDT 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 85°C 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 UL
94V-0 and encapsulant to UL 94V-1and the
connection pins are formed from a tin plated
alloy 42 leadframe.
1
ISOLATION CHARACTERISTICS
Parameter
Conditions
MIN
1000
1
TYP
MAX Units
VDC
Isolation Test Voltage
Resistance
Flash tested for 1 second
Viso=1KVDC
GW
1
GENERAL CHARACTERISTICS
Parameter
Conditions
MIN
100
410
TYP
125
500
MAX Units
100% load VIN nominal
25% load VIN nominal
150
kHz
Switching Frequency
590
1
ENVIRONMENTAL
Parameter
Operation
Storage
Conditions
MIN
–40
–50
TYP
MAX Units
85
130
°C
°C
°C
Case Temperature Above Ambient 100% Load
28
1 Specifications typical at TA =25°C, nominal input voltage and rated output current unless otherwise specified.
2 Measured at full load with external input/output capacitors, refer to test circuit.
3 A lower load is entirely safe but higher levels of output ripple will be experienced.
4 Calculated using MIL-HDBK-217F with nominal input voltage at full load.
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