Datasheet

NMT Series
Triple Output 3W DC/DC Converters
KDC_NMT.E04 Page 1 of 4
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SELECTION GUIDE
Order Code
Nominal
Input
Voltage
Output
Nominal
Output
Voltage
Output Current
1
Output Current
2
MTTF
3
Min. Load Full Load Min. Load Full Load
V V mA mA mA mA kHrs
NMT0572SC 5
-V
OUT1 -24 1.4 42 4.2 126
145-V
OUT2 -48 0.7 21 2.1 63
-V
OUT3 -72 0.5 14 1.4 42
NMT1272SC 12
-V
OUT1 -24 1.4 42 4.2 126
145
-V
OUT2 -48 0.7 21 2.1 63
-V
OUT3 -72 0.5 14 1.4 42
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
Voltage range
NMT0572SC 4.5 5.0 5.5
V
NMT1272SC 10.8 12 13.2
Ripple current (I
RIPPLE)
NMT0572SC 85
mA
NMT1272SC 66
Zero load input current
(I
CCZL)
NMT0572SC, 0% output load 50 80
mA
NMT1272SC, 0% output load 27.5 50
OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Total Rated Power (POUT) Total of all outputs or any single output 0.1 3.0 W
Single Channel Voltage Set
Point Accuracy
P
OUT = 100mW 0 10
%
P
OUT = 3W -7.5 2.5
Output Voltage - VOUT1
P
OUT = 100mW 24 26.4
V
P
OUT = 3W 22.2 24.6
Output Voltage - V
OUT2
P
OUT = 100mW 48 52.8
P
OUT = 3W 44.4 49.2
Output Voltage - VOUT3
P
OUT = 100mW 72 79.2
P
OUT = 3W 66.6 73.8
Line regulation V
IN = 90% to 110% of nominal 1.01 1.2
%
Load regulation P
OUT = 100mW to 3W 8 15
Ripple & Noise DC to 20MHz single channel (24V) 220 400 mV
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation test voltage Flash tested for 1 second 1000 VDC
Isolation Capacitance
NMT0572SC, 1MHz, 1V 65
pF
NMT1272SC, 1MHz, 1V 130
Insulation Resistance 1000VDC 1 10 GΩ
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
4
1 second
Lead temperature 1.5mm from case for 10 seconds 300°C
Input Voltage V
IN, NMT0572SC 7V
Input voltage V
IN, NMT1272SC 15V
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.
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
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.