SELECTION GUIDE
FEATURES
s
Dual Output from a Single Input Rail
s
Industry Standard Pinout
s
Power Sharing on Output
s
1kVDC Isolation
s
Efficiency to 80%
s
Power Density 0.85W/cm
3
s
24V & 48V Input
s
5V, 9V, 12V and 15V Output
s
Footprint from 1.17cm
2
s
UL 94V-0 Package Material
s
No Heatsink Required
s
Internal SMD Construction
s
Toroidal Magnetics
s
Fully Encapsulated
s
No External Components Required
s
Custom Solutions Available
DESCRIPTION
The NMA series of DC-DC converters are the
standard building blocks for on-board
distributed power systems. They are ideally
suited to providing dual rail supplies on
primarily digital boards with the added
benefit of galvanic isolation to reduce
switching noise. All of the rated power may
be drawn from a single pin provided the total
load does not exceed 1 Watt.
Nominal
Input
Output
Output
Voltage
Voltage
Current
MTTF
1
Order Code
(V)
(V)
(mA)
(%)
(pF)
kHrs
NMA2405D
24
5
100
70
39
194
NMA2409D
24
9
55
80
50
166
DIP
NMA2412D
24
12
42
80
65
134
NMA2415D
24
15
33
80
95
101
NMA2405S
24
5
100
70
39
194
NMA2409S
24
9
55
80
50
166
SIP
NMA2412S
24
12
42
80
65
134
NMA2415S
24
15
33
80
95
101
NMA4805D
48
5
100
70
26
206
NMA4809D
48
9
55
80
38
174
DIP
NMA4812D
48
12
42
80
52
139
NMA4815D
48
15
33
80
56
104
NMA4805S
48
5
100
70
26
206
NMA4809S
48
9
55
80
38
174
SIP
NMA4812S
48
12
42
80
52
139
NMA4815S
48
15
33
80
56
104
When operated with additional external load capacitance the rise time of the input voltage will determine the
maximum external capacitance value for guaranteed start up. The slower the rise time of the input voltage the
greater the maximum value of the additional external capacitance for reliable start up.
Parameter
Conditions
MIN
TYP
MAX
Units
Continuous operation, 24V input types
21.6
24
26.4
Voltage Range
Continuous operation, 48V input types
43.2
48
52.8
V
Parameter
Conditions
MIN
TYP
MAX
Units
Rated Power
2
T
A
= 0C to 70C
1
W
Voltage Set
Point Accuracy
See tolerance envelope
Line Regulation High V
IN
to low V
IN
1.2
%/%
10% load to rated load, 5V output types
15
Load Regulation
10% load to rated load, all other output types
10
%
Ripple & Noise BW=DC to 20MHz, all input types
150
mV p-p
Short-circuit duration
3
1 second
Lead temperature 1.5mm from case for 10 seconds
300C
Input voltage V
IN
, NMA24 types
28V
Input voltage V
IN
, NMA48 types
54V
INPUT CHARACTERISTICS
OUTPUT CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
1 Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2 See derating curve
3 Supply voltage must be discontinued at the end of the short circuit duration.
All specifications typical at T
A
=25C, nominal input voltage and rated output current unless otherwise specified.
NMA 24V & 48V SERIES
Isolated 1W Dual Output DC-DC Converters
www.dc-dc.com
NMA 24V & 48V SERIES
Isolated 1W 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 (NCL), Inc.
5816 Creedmoor Road, Raleigh
NC 27612, USA
Tel: +1 (919) 571-9405
Fax: +1 (919) 571-9262
email: info@us.cdtechno-ncl.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.
C&D Technologies (NCL) Limited 2001
NDC NMA2.3
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
ISOLATION CHARACTERISTICS
PERFORMANCE CHARACTERISTICS
GENERAL CHARACTERISTICS
TEMPERATURE CHARACTERISTICS
PIN CONNECTIONS
Parameter
Conditions
MIN
TYP
MAX
Units
Isolation Test Voltage
Flash tested for 1 second
1000
VDC
Resistance
Viso=500VDC
1
G
Parameter
Conditions
MIN
TYP
MAX
Units
Switching Frequency
All input types
100
kHz
Parameter
Conditions
MIN
TYP
MAX
Units
Specification
All output types
0
70
C
Storage
55
150
C
Cooling
Free air convection
14 Pin DIP
PIN
1
GND
7
NC
8
0V
9
+V
11
V
14
V
IN
7 Pin SIP
PIN
1
V
IN
2
GND
4
V
5
0V
6
+V
tolerance envelope
+
10%
+5%
V nominal
+2.5%
-2.5%
-7.5%
10
50
100
Output Load Current (%)
19.50
9.80
MECHANICAL DIMENSIONS
6.80*
15.24
1.09
2.13
7.62
4.60
3.60
0.55
0.45
0.55
0.45
2.54
19.50
6.00**
10.0
2.00
1.25
12.70
4.60
3.60
2.54
* 7.70 for 48V variants
**7.50 for 48V variants
All dimensions in mm XX.XX 0.25mm. All pins on a
2.54mm pitch and within 0.25mm of true position.
14 Pin DIP
We i g h t : 2.3g (24V)
2.9g (48V)
7 Pin SIP
We i g h t : 2.3g (24V)
2.9g (48V)
NMA2405D
XYYWW
NMA2405S
XYYWW
1 2
5
6
4
0.30
0.20
8
9
11
14
7
1
0.30
0.20
0.55
0.45
temperature derating graph
2.0
1.5
1.0
0.5
0
50
0
50
70
100 125 150
Ambient Temperature (C)
Safe Operating Area
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