NMT Datasheet, PDF (1/2 Pages) C&D Technologies – Triple Output 3W DC-DC Converters

NMT SERIES
Triple Output 3W DC-DC Converters
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/cm³
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.
www.dc-dc.com
SELECTION GUIDE
Nominal
Input
Voltage
Order Code (V)
Output
VO1
Rated
Output
Voltage
V
–24
Output Current²
MIN
Load
Full
Load
(mA)
(mA)
1.4
42
Output Current³
MIN
Load
Full
Load
(mA)
(mA)
4.2
126
MTTF¹
kHrs
NMT0572S
5
VO2
–48
0.7
21
2.1
63 145
VO3
–72
0.5
14
1.4
42
VO1
–24
1.4
42
4.2
126
NMT1272S
12
VO2
–48
0.7
21
2.1
63 145
VO3
–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
Voltage Range
(V_IN )
Ripple Current
(I_RIPPLE)
Zero Load Input
Current (I_CCZL)
Conditions
NMT0572S
NMT1272S
NMT0572S
NMT1272S
NMT0572S, 0% output load
NMT1272S, 0% output load
MIN
4.5
10.8
TYP
5.0
12
85
66
50
27.5
MAX
5.5
13.2
80
50
Units
V
mA
mA
OUTPUT CHARACTERISTICS
Parameter
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
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
VIN = 90% to 110%
of nominal
P_OUT = 100mW to 3W
DC to 20MHz single
channel (24V)
MIN
0.1
0
–7.5
24.0
22.2
48.0
44.4
72.0
66.6
0
TYP
1.01
8
220
MAX
3.0
10
2.5
26.4
24.6
52.8
49.2
79.2
73.8
1.2
15
400
Units
W
%
V
V
V
%
%
mV
ABSOLUTE MAXIMUM RATINGS
Short-circuit duration⁴
Lead temperature 1.5mm from case for 10 seconds
Input voltage VIN, NMT0572S
Input voltage VIN, NMT1272S
1 second
300°C
7V
15V
ISOLATION CHARACTERISTICS
Parameter
Isolation Voltage (V_ISOL)
Isolation Capacitance (C_ISOL)
Insulation Resistance
Conditions
Flash tested for 1 second
NMT0572S, 1MHz, 1V
NMT1272S, 1MHz, 1V
1000VDC test
MIN TYP MAX Units
1000
VDC
65
pF
130
1
10
GΩ
GENERAL CHARACTERISTICS
Parameter
Conditions
MIN TYP MAX Units
Efficiency
All channels or any single channel 75 85
%
Switching Frequency (f_OSC)
85
kHz
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.