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NDT SERIES
Isolated 3W Wide Input Dual Output DC-DC Converters
SELECTION GUIDE 1
Nominal Rated Input Output Voltage Voltage
Output Current Min Load3 Full Load
Input Current Full Load MTTF4
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 4.73cm2 s UL 94V-0 Package Materials s Operating Temperature Range -40C to 85C 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 DCDC 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 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 Voltage Range 48V input types Reflected Ripple 24V input types with 10F at input Current 48V input types with 10F at input
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 300C 25% of rated output
ISOLATION CHARACTERISTICS1
Parameter Conditions MIN TYP MAX Units
Isolation Test Voltage Resistance
Flash tested for 1 second Viso=1KVDC
1000 1
VDC G
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
ENVIRONMENTAL1
Parameter Conditions MIN TYP MAX Units
Operation Storage Case Temperature Above Ambient 100% Load
- 40 - 50 28
85 130
C C C
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1 Specifications typical at T A =25C, 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 = VOUT (Low Input V) -V OUT (High Input V) x100% VOUT (Nominal Input V)
PIN CONNECTIONS
24 Pin DIL (top view)
-V IN -V IN
2 3
23 22
+VIN +VIN
Where VOUT (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 CIN 10F, 200V COUT 47F, 25V
TEST CIRCUIT
VIN +VOUT COUT CIN
-VOUT
PACKAGING DETAILS
Order Code Packaging Style QTY
NDT
0V COUT
NDTDXXXX
Tube
15
TUBE OUTLINE DIMENSIONS
0.6570.022 (16.700.55) 0.8150.022 (20.700.55)
GND
-VOUT
MECHANICAL DIMENSIONS
1.270(32.26) 0.100(2.54) 0.200 (5.08)
0.6570.031 (16.700.80) 0.2170.001 (5.500.25) 0.2680.022 6.800.55 0.0310.006 (0.800.15) Tube Length: 20.4720.079(520mm2mm) Tube Material: Antistatic coated clear pvc.
0.577(14.66)
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) O 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) O0.1
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) 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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