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NDY SERIES
Isolated 3W Wide Input DC/DC Converters
KDC_NDYC.5 Page 1 of 4
SELECTION GUIDE
Order Code
Nominal
Input
Voltage
Rated
Output
Voltage
Output Current
1Input
Current
Full load
Efficiency
2
(MIN.)
Isolation
Capacitance MTTF
3
MIN. Load Full Load
V (nom.) V mA mA mA % pF kHrs
NDY0505C 5 5 100-150 400-600 615 66 40 1939
NDY0509C 5 9 55-83 222-333 563 72 52 1926
NDY0512C 5 12 42-62 166-250 548 71 43 1907
NDY0515C 5 15 33-50 133-200 533 73 44 1924
NDY1205C 12 5 150 600 362 71 36 1928
NDY1209C 12 9 83 333 320 78 52 1916
NDY1212C 12 12 62 250 316 78 44 1897
NDY1215C 12 15 50 200 308 79 47 1914
NDY2403C 24 3.3 227 909 178 70 30 1671
NDY2405C 24 5 150 600 174 70 36 1673
NDY2409C 24 9 83 333 156 78 52 1663
NDY2412C 24 12 62 250 154 80 44 1644
NDY2415C 24 15 50 200 150 82 54 1657
NDY4803C 48 3.3 227 909 87 71 30 1676
NDY4805C 48 5 150 600 87 73 35 1668
NDY4809C 48 9 83 333 78 80 52 1663
NDY4812C 48 12 62 250 77 81 44 1648
NDY4815C 48 15 50 200 76 81 53 1661
INPUT CHARACTERISTICS
Parameter Conditions MIN. TYP. MAX. Units
Voltage range
All NDY05XX 4.5 5 9
VDC
All NDY12XX 9 12 18
All NDY24XX 18 24 36
All NDY48XX 36 48 72
Reflected ripple current
2
NDY2403 180 360
mA p-p
NDY4803 140 290
All NDY05XX 400 500
All NDY12XX 150 170
All other NDY24XX 290 360
All other NDY48XX 100 127
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection Continuous
Lead temperature 1.5mm from case for 10 seconds 300°C
Minimum load 25% of rated load
Input voltage 05 types 10V
Input voltage 12 types 20V
Input voltage 24 types 40V
Input voltage 48 types 80V
Internal dissipation 1.7W
1. Refer to power derating graph.
2. Measured at full load with external input/output capacitors, refer to filter circuit 1.
3. Calculated using MIL-HDBK-217F with nominal input voltage at full load (ground benign) at 25°C.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
FEATURES
nRoHS compliant
nIndustry standard footprint
nEfficiency to 82%
nPower density 0.90W/cm3
n2:1 wide input range
nSingle isolated output
nShort circuit protection
nLow profile 24 pin case
nUL 94V-0 package material
nOperating temperature range -40ºC to 85ºC
nNo heatsink required
nFootprint 4.73cm2
n5V, 12V, 24V & 48V input
n3.3V, 5V, 9V, 12V & 15V output
nInternal SMD construction
nFully encapsulated
DESCRIPTION
The NDY series is a range of low profile DC/DC
converters offering a single regulated output over a
2:1 input voltage range. All parts deliver 3W output
power up to 85ºC without heatsinking, except the
4.5V to 9V input voltage range which should be
derated to 2W at the lower input voltage. 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.
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NDY SERIES
Isolated 3W Wide Input DC/DC Converters
KDC_NDYC.5 Page 2 of 4
OUTPUT CHARACTERISTICS
Parameter Conditions MIN. TYP. MAX. Units
Voltage set point accuracy With external input/output capacitors ±1 ±5 %
Line regulation Low line to high line, 3.3V output with external input/output capacitors 0.05 0.25 %
Low line to high line, all other outputs with external input/output capacitors 0.05 0.5 %
Load regulation 25% load to 100% load, 3.3V output with external input/output capacitors 0.6 1.0 %
25% load to 100% load, all other outputs with external input/output capacitors 0.2 0.5 %
Ripple1BW = 20Hz to 300kHz, 3.3V output with external input/output capacitors 80 120 mV rms
BW = 20Hz to 300kHz, all other outputs with external input/output capacitors 5 10
Noise1BW = DC to 100MHz, 3.3V output with external input/output capacitors 180 mV p-p
BW = DC to 20MHz, all other outputs with external input/output capacitors 50 100
GENERAL CHARACTERISTICS
Parameter Conditions MIN. TYP. MAX. Units
Switching frequency
100% load VIN nominal 3.3V output 160 220
kHz
25% load VIN nominal 3.3V output 290 560
100% load VIN nominal, all other outputs 80 220
25% load VIN nominal, all other outputs 290 560
TEMPERATURE CHARACTERISTICS
Parameter Conditions MIN. TYP. MAX. Units
Operation -40 85 ºC
Storage -50 130
Cooling Free air convection
ISOLATION CHARACTERISTICS
Parameter Conditions MIN. TYP. MAX. Units
Isolation test voltage Flash tested for 1 second 1000 VDC
Resistance Viso=500VDC 1 GΩ
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.
C&D Technologies NDY 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 NDY 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 NDY 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.
1. For lower ripple refer to circuit for reduced ripple.
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NDY SERIES
Isolated 3W Wide Input DC/DC Converters
KDC_NDYC.5 Page 3 of 4
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering
systems with a peak wave solder temperature of
300ºC for 10 seconds. The pin termination finish
on this product series is Bright Tin. The series
is backward compatible with Sn/Pb soldering
systems.
For further information, please visit www.cd4power.com/rohs
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.
Value
CIN COUT LOUT
10µF, 200V
good low esr capacitor
100µF, 25V
good low esr capacitor
C&D Technologies
Part No. 24100C
Test circuit, 5V, 12V and 15V output
Recommended circuit for reduced ripple 3.3V output
Output load
The minimum rated load across the whole input voltage range is 25% of the full load output. It is important to take care that the load does not fall below this as the output ripple
will greatly increase. While this condition will not harm the device the resultant increase in output ripple could cause customers’ application to malfunction.
NDY COUT
CIN
- VIN
+ VIN + VOUT
- VOUT
NDY COUT
CIN
- VIN
+ VIN + VOUT
- VOUT
LOUT
NDY05 POWER DERATING CURVE
4.5
2
3
4
5
Isolation voltage (V)
Output Power (W)
1
05 6 7 8 9
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NDY SERIES
Isolated 3W Wide Input DC/DC Converters
KDC_NDYC.5 Page 4 of 4
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS PIN CONNECTIONS (TOP VIEW)
RECOMMENDED FOOTPRINT DETAILS
TUBE OUTLINE DIMENSIONS
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 website to ensure that you have the current
and complete specification for your product before use.
© C&D Technologies (NCL) Limited 2006 KDC_NDYC.5
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.cd4power.com.
C&D Technologies (NCL) Ltd
Tanners Drive, Blakelands North
Milton Keynes, MK14 5BU, UK
Tel: +44 (0)1908 615232
Fax: +44 (0)1908 617545
email: mk@cdtechno.com
C&D Technologies, Inc.
11 Cabot Boulevard, Mansfield,
MA 02048-1151, USA
Tel: +1 (508) 339-3000
Fax: +1 (800) 233-2765
email: sales@cdtechno.com
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.
Weight: 6.2g (3.3V: 6.7g)
."9
/%:$
9::88
Unless otherwise stated all dimensions in inches ±0.01 (mm) ±0.5mm.
Tube length : 20.47±0.079 (520mm ±2mm). Tube Quantity : 15
Unless otherwise stated all dimensions in inches ±0.01 (mm ±0.5mm).
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