NDT SERIES
Isolated 3W Wide Input Dual Output DC-DC Converters
SELECTION GUIDE
1
Nominal Rated
Input
Output
Voltage Voltage
Output Current
Min Load
3
Full Load
Input
Current
Full Load
MTTF
4
Order Code
NDTD2412
NDTD2415
NDTD4812
NDTD4815
(V)
24
24
48
48
(V)
12
15
12
15
(mA)
±31
±25
±31
±25
(mA)
±125
±100
±125
±100
(mA)
156
155
77
77
(%)
79
80
81
81
(pF)
30
30
30
30
kHrs
2075
2080
2090
2045
INPUT CHARACTERISTICS
1
FEATURES
s
Industry Standard Footprint
s
1kVDC Isolation
s
Dual Isolated Output
s
Short Circuit Protection
s
Low Profile 24 Pin Case
s
Efficiency to 81%
s
Power Density 0.90W/cm
3
s
2:1 Wide Input Range
s
24V & 48V Input
s
12V & 15V Output
s
Footprint 4.73cm
2
s
UL 94V-0 Package Materials
s
Operating Temperature Range
–40°C to 85°C
s
Load and Line Regulation
<1% on Both Outputs
s
No Heatsink Required
s
Internal SMD Construction
s
Fully Encapsulated
s
Custom Solutions Available
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.
Parameter
Conditions
MIN
TYP
MAX
Units
24V input types
48V input types
24V input types with 10µF at input
Reflected Ripple
Current
48V input types with 10µF at input
Voltage Range
18
36
24
48
200
125
36
75
250
150
VDC
mA p-p
OUTPUT CHARACTERISTICS
1
Parameter
Conditions
MIN
TYP
MAX
Units
With external input/output capacitors,
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
BW = 20Hz to 300kHz
Ripple
With external input/output capacitors,
refer to recommended test circuit
BW = DC to 20MHz
Ripple & Noise With external input/output capacitors,
refer to recommended test circuit
% voltage change on negative output
Cross
when positive load varies from 12% to
Regulation
50% with negative load fixed at 50%
Rated Power
Voltage Set
Point Accuracy
3
±1
0.15
0.2
15
90
2.1
±5
0.5
0.5
30
150
3.0
W
%
%
%
mV rms
mV p-p
%
ABSOLUTE MAXIMUM RATINGS
Short circuit protection over temperature range and input voltage range
Input Voltage, 24V types
Input Voltage, 48V types
Lead temperature 1.5mm from case for 10 seconds
Minimum Load
continuous
40V
80V
300°C
25% of rated output
ISOLATION CHARACTERISTICS
1
Parameter
Conditions
MIN
TYP
MAX
Units
Isolation Test Voltage
Resistance
Flash tested for 1 second
Viso=1KVDC
1000
1
VDC
GΩ
GENERAL CHARACTERISTICS
1
Parameter
Conditions
MIN
TYP
MAX
Units
Switching Frequency
100% load V
IN
nominal
25% load V
IN
nominal
100
410
125
500
150
590
kHz
ENVIRONMENTAL
1
Parameter
Conditions
MIN
TYP
MAX
Units
Operation
Storage
Case Temperature Above Ambient 100% Load
– 40
– 50
28
85
130
°C
°C
°C
www.dc-dc.com
1 Specifications typical at T
A
=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.
NDT SERIES
Isolated 3W Wide Input Dual Output DC-DC Converters
TERMINOLOGY
LINE REGULATION
The percentage change in output voltage between low input voltage and high input voltage,
measured with fixed output load
ie. A 5V output 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 =
V
OUT
(Low Input V) –V
OUT
(High Input V)
x100%
V
OUT
(Nominal Input V)
PIN CONNECTIONS
24 Pin DIL (top view)
–V
IN
–V
IN
2
3
23
22
+V
IN
+V
IN
Where V
OUT
(Nominal Input V) is 5V.
Common
9
11
16
14
Common
+V
OUT
APPLICATION NOTES
EXTERNAL CAPACITANCE
Although these converters will work
without external capacitors, they ar e
necessary in order to guarantee the full
parametric performance over the
full line and load range. All parts have
been tested and characterised
using the following values and test circuit
Value
C
IN
10µF, 200V
C
OUT
47µF, 25V
TEST CIRCUIT
V
IN
+V
OUT
C
OUT
C
IN
–V
OUT
PACKAGING DETAILS
Order Code
Packaging Style
QTY
NDT
0V
C
OUT
NDTDXXXX
Tube
15
TUBE OUTLINE DIMENSIONS
0.657±0.022
(16.70±0.55)
0.815±0.022
(20.70±0.55)
GND
–V
OUT
MECHANICAL DIMENSIONS
1.270(32.26)
0.100(2.54)
0.200
(5.08)
0.657±0.031
(16.70±0.80)
0.217±0.001
(5.50±0.25)
0.268±0.022
6.80±0.55
0.577(14.66)
0.031±0.006
(0.80±0.15)
Tube Length: 20.472±0.079(520mm±2mm)
Tube Material: Antistatic coated clear pvc.
RECOMMENDED FOOTPRINT DETAILS
0.275(7.00)
0.185(4.70)
0.145(3.70)
0.185
(4.70)
Weight: 6.5g
0.033(0.84)
0.021(0.54)
0.900(22.86)
0.012(0.30)
0.008(0.20)
0.600(15.25)Max
0.057(1.45)
Ø
0.051(1.30)
0.100(2.54) 8 Holes
All pins on a 0.100(2.54) pitch
and within 0.010(0.25) of true position.
0.100
(2.54)
Ø0.1
Unless otherwise stated all dimensions in inches ±0.010 (mm ±0.25mm).
C&D Technologies (NCL) Limited reserve the right to alter or improve the
specification, internal design or manufacturing process at any time, without
notice. Please check with your supplier or visit our web site to ensure that
you have the current and complete specification for your product before use.
© C&D Technologies (NCL) Limited 2002
NDC NDT.1
No part of this publication may be copied, transmitted or stored in a
retrieval system or reproduced in any way including, but not limited to,
photography, photocopy, magnetic or other recording means, without prior
written permission from C&D Technologies (NCL) Limited.
Instructions for use are available from www.dc-dc.com
C&D Technologies (NCL) Ltd
Tanners Drive, Blakelands North
Milton Keynes MK14 5BU, England
Tel: +44 (0)1908 615232
Fax:+44 (0)1908 617545
email: info@cdtechno-ncl.com
www: http://www.dc-dc.com
C&D Technologies Inc.
3400 E Britannia Drive, Tucson,
Arizona 85706, USA
Tel: +1 (800) 547-2537
Fax: +1 (520) 741-4598
email: sales@cdtechno.com
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