NMT SERIES
Triple Output 3W DC-DC Converters
SELECTION GUIDE
Nominal
Input
Voltage
Output
Rated
Output
Voltage
Output Current
2
MIN
Full
Load
Load
Output Current
3
MIN
Full
Load
Load
MTTF
1
Order Code
(V)
VO1
V
–24
–48
–72
–24
–48
–72
(mA)
1.4
0.7
0.5
1.4
0.7
0.5
(mA)
42
21
14
42
21
14
(mA)
4.2
2.1
1.4
4.2
2.1
1.4
(mA)
126
63
42
126
63
42
kHrs
NMT0572S
5
VO2
VO3
VO1
145
NMT1272S
12
VO2
VO3
145
FEATURES
s
Triple Outputs (–24V, –48V & –72V)
s
Toroidal Magnetics
s
Input/Output Isolation 1kVDC
s
Power Sharing on Outputs
s
Internal SMD Construction
s
Industrial Temperature Range
s
No External Components Required
s
Power Density 1.41W/cm
3
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.
INPUT CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
s
UL 94V-0 Package Material
DESCRIPTION
The NMT series is a range of DC-DC
converters offering three output voltages of
–24V, –48V and –72V from a single isolated
5V or 12V input voltage. The product is
designed for use with telecommunications
circuits requiring an on board supply for the
–72V RING-TIP connection service generated
from a nominal 5V or 12V DC input supply
rail. The device also offers battery level
voltages of –24V and –48V for access
control and data pump IC's. The product is
packaged in an 8 pin SIP case for minimum
PCB footprint. The rated power may be
shared or drawn from any one output
providing the total output load does not
exceed 3W.
NMT0572S
NMT1272S
Ripple Current NMT0572S
(I
RIPPLE
)
NMT1272S
Zero Load Input NMT0572S, 0% output load
Current (I
CCZL
)
NMT1272S, 0% output load
Voltage Range
(V
IN
)
4.5
10.8
5.0
12
85
66
50
27.5
5.5
13.2
V
mA
80
50
mA
OUTPUT CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Total Rated Power (P
OUT
)
Single Channel Voltage
Setpoint Accuracy
Output Voltage - VO1 (V
OUT
)
Output Voltage - VO2 (V
OUT
)
Output Voltage - VO3 (V
OUT
)
Line Regulation
Load Regulation
Ripple & Noise
Total of all outputs or any
single output
P
OUT
= 100mW
P
OUT
= 3W
P
OUT
= 100mW
P
OUT
= 3W
P
OUT
= 100mW
P
OUT
= 3W
P
OUT
= 100mW
P
OUT
= 3W
VIN = 90% to 110%
of nominal
P
OUT
= 100mW to 3W
DC to 20MHz single
channel (24V)
0.1
0
–7.5
24.0
22.2
48.0
44.4
72.0
66.6
1.01
8
0
220
3.0
10
2.5
26.4
24.6
52.8
49.2
79.2
73.8
1.2
15
400
W
%
V
V
V
%
%
mV
ABSOLUTE MAXIMUM RATINGS
Short-circuit duration
4
Lead temperature 1.5mm from case for 10 seconds
Input voltage V
IN
, NMT0572S
Input voltage V
IN
, NMT1272S
1 second
300°C
7V
15V
ISOLATION CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Isolation Voltage (V
ISOL
)
Isolation Capacitance (C
ISOL
)
Insulation Resistance
Flash tested for 1 second
NMT0572S, 1MHz, 1V
NMT1272S, 1MHz, 1V
1000VDC test
1000
65
130
10
VDC
pF
GΩ
1
GENERAL CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Efficiency
All channels or any single channel
Switching Frequency (f
OSC
)
75
85
85
%
kHz
www.dc-dc.com
1 Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2 Assuming all 3 channels are equally loaded.
3 Assuming only 1 channel is loaded.
4 Supply voltage must be discontinued at the end of the short circuit duration.
All specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
NMT SERIES
Triple Output 3W DC-DC Converters
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
PIN CONNECTIONS
-40
-50
85
125
27
°C
°C
°C
PIN
1
V
IN
2 GND
5
0V
6
V01
7
V02
8
V03
Operating Temperature (T
A
)
Storage
Case Temperature Rise
Above Ambient
1 litre static air chamber
OUTPUT VOLTAGE CONFIGURATION
Although the output is described for negative rails, the input and output circuits are internally
isolated hence positive rails can also be generated, or a mixture of positive and negative.
The output 0V rail reference can be taken from any of the output terminals to give the range
of outputs as described in
Output Voltage Configurations
table below.
Channel Name
Standard Ref
Option 1
Option 2
Option 3
POWER SHARING
The 3W total power delivery can be taken from
either a single channel, or from any combination of
all three channels. This allows an enormous amount
of flexibility, especially when combined with the
selectable output 0V reference. For example, using
the option 2 output configuration; –24V at 0.5W,
+24V at 1W and +48V at 1.5W power supplies
are available from a single NMT device.
0V
V01
V02
V03
0V
–24V
–48V
–72V
+24V
0V
–24V
–48V
+48V
+24V
0V
–24V
+72V
+48V
+24V
0V
PERFORMANCE CHARACTERISTICS
NMT0572S – Channel V01 (24V NOM)
100
80
60
40
20
0
0
0.5
1.0 1.5 2.0 2.5
Output Power (W)
3.0
40
36
32
28
24
20
0
0.5
1.0 1.5 2.0 2.5
Output Power (W)
3.0
100
80
60
40
20
0
0
0.5
1.0 1.5 2.0 2.5
Output Power (W)
3.0
NMT1272S – Channel V01 (24V NOM)
40
36
32
28
24
20
0
0.5
1.0 1.5 2.0 2.5
Output Power (W)
3.0
NMT0572S – Channel V02 (48V NOM)
100
80
60
40
20
0
0
0.5
1.0 1.5 2.0 2.5
Output Power (W)
3.0
80
72
64
56
48
40
0
0.5
1.0 1.5 2.0 2.5
Output Power (W)
3.0
100
80
60
40
20
0
0
0.5
NMT1272S – Channel V02 (48V NOM)
80
72
64
56
48
40
1.0 1.5 2.0 2.5
Output Power (W)
3.0
0
0.5
1.0 1.5 2.0 2.5
Output Power (W)
3.0
NMT0572S – Channel V03 (72V NOM)
100
80
60
40
20
0
0
0.5
1.0 1.5 2.0 2.5
Output Power (W)
3.0
120
108
96
84
72
60
0
0.5
1.0 1.5 2.0 2.5
Output Power (W)
3.0
100
80
60
40
20
0
0
0.5
NMT1272S – Channel V03 (72V NOM)
120
108
96
84
72
60
1.0 1.5 2.0 2.5
Output Power (W)
3.0
0
0.5
1.0 1.5 2.0 2.5
Output Power (W)
3.0
MECHANICAL DIMENSIONS
7.50
11.10
NMT0572S
XYYWW
21.80
1.17
0.30
0.20
2.54
2.10
0.55
0.45
0.55
0.45
Weight: 3.85g
4.60
3.60
1 2
5
6
7
8
All dimensions in mm XX.XX ±0.25mm.
All pins on a 2.54mm pitch and within ±0.25mm of true position.
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 NMT.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
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
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