NMT Series
Triple Output 3W DC/DC Converters
SELECTION GUIDE
Order Code
Nominal
Input
Voltage
V
5
Output
-V
OUT1
-V
OUT2
-V
OUT3
-V
OUT1
-V
OUT2
-V
OUT3
Rated
Output
Current
V
-24
-48
-72
-24
-48
-72
Output Current
1
Output Current
2
MTTF
3
kHrs
145
Min. Load Full Load Min. Load Full Load
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
NMT0572SC
NMT1272SC
12
145
FEATURES
RoHS compliant
Triple outputs (-24V, -48V & -72V)
Input/output isolation 1kVDC
Power sharing on outputs
Industrial temperature range
UL 94V-0 package material
Internal SMD construction
Toroidal magnetics
No external components required
Power density 1.65W/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
Voltage range
Ripple current (I
RIPPLE
)
Zero load input current
(I
CCZL
)
Conditions
NMT0572SC
NMT1272SC
NMT0572SC
NMT1272SC
NMT0572SC, 0% output load
NMT1272SC, 0% output load
Min.
4.5
10.8
Typ.
5.0
12
85
66
50
27.5
Max.
5.5
13.2
Units
V
mA
80
50
mA
OUTPUT CHARACTERISTICS
Parameter
Total Rated Power (P
OUT
)
Single Channel Voltage Set
Point Accuracy
Output Voltage - V
OUT
1
Output Voltage - V
OUT
2
Output Voltage - V
OUT
3
Line regulation
Load regulation
Ripple & Noise
Conditions
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
V
IN
= 90% to 110% of nominal
P
OUT
= 100mW to 3W
DC to 20MHz single channel (24V)
Min.
0.1
0
-7.5
24
22.2
48
44.4
72
66.6
Typ.
Max.
3.0
10
2.5
26.4
24.6
52.8
49.2
79.2
73.8
1.2
15
400
Units
W
%
DESCRIPTION
The NMT series is a range of DC/DC convert-
ers 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.
V
1.01
8
220
%
mV
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Isolation Capacitance
Insulation Resistance
Conditions
Flash tested for 1 second
NMT0572SC, 1MHz, 1V
NMT1272SC, 1MHz, 1V
1000VDC
Min.
1000
Typ.
65
130
10
Max.
Units
VDC
pF
GΩ
1
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
4
Lead temperature 1.5mm from case for 10 seconds
Input Voltage V
IN
, NMT0572SC
Input voltage V
IN
, NMT1272SC
1 second
300°C
7V
15V
For full details go to
www.murata-ps.com/rohs
1. Assuming all 3 channels are equally loaded.
2. Assuming only 1 channel is loaded.
3. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
4. Supply voltage must be disconnected 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.
www.murata-ps.com
Technical enquiries
-
email:
mk@murata-ps.com,
tel:
+44 (0)1908 615232
KDC_NMTC.E02
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MURATA [ MURATA MANUFACTURING CO., LTD. ]
