NDTD2412 - C&D Technologies, Inc.

SELECTION GUIDE1

FEATURES

■Industry Standard Footprint

■1kVDC Isolation

■Dual Isolated Output

■Short Circuit Protection

■Low Profile 24 Pin Case

■Efficiency to 81%

■Power Density 0.90W/cm3

■2:1 Wide Input Range

■24V & 48V Input

■12V & 15V Output

■Footprint 4.73cm2

■UL 94V-0 Package Materials

■Operating Temperature Range

–40°C to 85°C

■Load and Line Regulation

<1% on Both Outputs

■No Heatsink Required

■Internal SMD Construction

■Fully Encapsulated

■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.

Nominal Rated Input

Input Output Output Current Current

Voltage Voltage Min Load3Full Load Full Load MTTF4

Order Code (V) (V) (mA) (mA) (mA) (%) (pF) kHrs

NDTD2412 24 12 ±31 ±125 156 79 30 2075

NDTD2415 24 15 ±25 ±100 155 80 30 2080

NDTD4812 48 12 ±31 ±125 77 81 30 2090

NDTD4815 48 15 ±25 ±100 77 81 30 2045

Parameter Conditions MIN TYP MAX Units

Voltage Range 24V input types 18 24 36 VDC

48V input types 36 48 75

Reflected Ripple 24V input types with 10µF at input 200 250 mA p-p

Current 48V input types with 10µF at input 125 150

Short circuit protection over temperature range and input voltage range continuous

Input Voltage, 24V types 40V

Input Voltage, 48V types 80V

Lead temperature 1.5mm from case for 10 seconds 300°C

Minimum Load 25% of rated output

INPUT CHARACTERISTICS1

OUTPUT CHARACTERISTICS1

ABSOLUTE MAXIMUM RATINGS

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.

4Calculated using MIL-HDBK-217F with nominal input voltage at full load.

NDT SERIES

Isolated 3W Wide Input Dual Output DC-DC Converters

www.dc-dc.com

ISOLATION CHARACTERISTICS1

GENERAL CHARACTERISTICS1

ENVIRONMENTAL1

Parameter Conditions MIN TYP MAX Units

Isolation Test Voltage Flash tested for 1 second 1000 VDC

Resistance Viso=1KVDC 1 GΩ

Parameter Conditions MIN TYP MAX Units

Switching Frequency 100% load VIN nominal 100 125 150 kHz

25% load VIN nominal 410 500 590

Parameter Conditions MIN TYP MAX Units

Operation –40 85 °C

Storage –50 130 °C

Case Temperature Above Ambient 100% Load 28 °C

Parameter Conditions MIN TYP MAX Units

Rated Power 3 W

Voltage Set 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, 0.15 0.5 %

refer to recommended test circuit

25% load to 100% load,

Load Regulation with external input/output capacitors, 0.2 0.5 %

refer to recommended test circuit

BW = 20Hz to 300kHz

Ripple With external input/output capacitors, 15 30 mV rms

refer to recommended test circuit

BW = DC to 20MHz

Ripple & Noise With external input/output capacitors, 90 150 mV p-p

refer to recommended test circuit

Cross % voltage change on negative output

Regulation when positive load varies from 12% to 2.1 3.0 %

50% with negative load fixed at 50%

NDT SERIES

Isolated 3W Wide Input Dual Output DC-DC Converters

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

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.

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

APPLICATION NOTES

TERMINOLOGY

Weight: 6.5g Unless otherwise stated all dimensions in inches ±0.010 (mm ±0.25mm).

1.270(32.26)

0.577(14.66)

0.275(7.00)

0.185(4.70)

0.145(3.70)

0.033(0.84)

0.021(0.54)

0.012(0.30)

0.008(0.20)

0.900(22.86) 0.600(15.25)Max

MECHANICAL DIMENSIONS

0.100(2.54)

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) –VOUT (High Input V) x100%

VOUT (Nominal Input V)

Where VOUT (Nominal Input V) is 5V.

PIN CONNECTIONS

TUBE OUTLINE DIMENSIONS

EXTERNAL CAPACITANCE

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 characterised

using the following values and test circuit

TEST CIRCUIT

Value

CIN COUT

10µF, 200V 47µF, 25V

COUT

CIN

VIN

+VOUT

GND

–VOUT

NDT

0.185

(4.70)

0.200

(5.08)

2 23

3 22

9 16

11 14

–VIN

Common

–VOUT

+VIN

Common

+VOUT

24 Pin DIL (top view)

PACKAGING DETAILS

Order Code Packaging Style QTY

NDTDXXXX Tube 15

0.815±0.022

(20.70±0.55)

0.268±0.022

6.80±0.55

0.031±0.006

(0.80±0.15)

Tube Length: 20.472±0.079(520mm±2mm)

Tube Material: Antistatic coated clear pvc.

0.657±0.022

(16.70±0.55)

0.217±0.001

(5.50±0.25)

0.657±0.031

(16.70±0.80)

RECOMMENDED FOOTPRINT DETAILS

0.100(2.54)

Ø0.057(1.45)

0.051(1.30)

8 Holes

0.100

(2.54)

Ø0.1

All pins on a 0.100(2.54) pitch

and within 0.010(0.25) of true position.