10 Watt NT Single Series DC/DC Converters
•
Fully Self Contained, No External Parts Required for
•
•
•
•
•
•
•
Operation
Low and Specified Input/Output Capacitance
Efficiencies to 85%
Overcurrent Protected for Long, Reliable Operation
Five-sided, Shielded, Low Thermal Gradient Copper
Case
Water Washable Case Design
5 Year Warranty
RoHS Compliant
Selection Chart
Model
Input Range
VDC
Min
2S3.2000NT
2S5.2000NT
2S2.900NT
2S5.700NT
*24S3.2000NT
24S5.2000NT
24S2.900NT
24S5.700NT
*48S3.2000NT
*48S5.2000NT
*48S2.900NT
*48S5.700NT
48S5.500NT
9
9
9
9
8
8
8
8
36
36
36
36
36
Max
8
8
8
8
36
36
36
36
72
72
72
72
60
Outputs
VDC
3.33
5
2
5
3.33
5
2
5
3.33
5
2
5
5
Outputs
mA
2000
2000
900
700
2000
2000
900
700
2000
2000
900
700
500
Features
Description
These 0 Watt DC/DC converters were designed for fast
integration with your system’s power needs. With no external
components or filtering necessary for all but the most critical
applications, these converters can provide power instantly.
This saves you costly engineering time required to design your
system around the power converter.
*Agency Approvals: CSA/UL 60950
**To order add “(RoHS)” to the part number. i.e 24S5.2000NT (RoHS)
10 Watt NT Single Series Block Diagram
240 Stanwell Drive, Concord Ca. 94520
Ph: 925-687-44
Fax: 925-687-3333
www.calex.com
Email: sales@calex.com
eco# 04007-,090309-, 00426-
10 Watt NT Single Series DC/DC Converters
Input Parameters (1)
Model
Voltage Range
Reflected Ripple, (2)
Input Current
Full Load
No Load
Efficiency
Switching Frequency
Maximum Input
Overvoltage,
00 ms Maximum
Turn-on Time, %
Output Error
Recommended Fuse
Model
Voltage Range
Reflected Ripple, (2)
Input Current
Full Load
No Load
Efficiency
Switching Frequency
Maximum Input
Overvoltage,
00 ms Maximum
Turn-on Time, %
Output Error
Recommended Fuse
Model
Voltage Range
Reflected Ripple, (2)
Input Current
Full Load
No Load
Efficiency
Switching Frequency
Maximum Input
Overvoltage,
00 ms Maximum
Turn-on Time, %
Output Error
Recommended Fuse
()
All parameters measured at T
c
=25ºC, nominal input voltage
and full rated load unless otherwise noted. Refer to the CALEX
Application Notes for the definition of terms, measurement
circuits and other information
Noise is measured per CALEX Application Notes. Measurement
bandwidth is 0-20 MHz for peak-peak measurements, 0 kHz
to MHz for RMS measurements. Output noise is measured
with a 0.0µF / 00V ceramic capacitor in parallel with a µF /
35V Tantalum capacitor, inch from the output pins to simulate
standard PCB decoupling capacitance.
240 Stanwell Drive, Concord Ca. 94520
Ph: 925-687-44
2
(3)
(4)
(5)
(6)
(7)
MIN
MAX
TYP
TYP
TYP
TYP
TYP
TYP
MAX
TYP
MIN
MAX
TYP
TYP
TYP
TYP
TYP
TYP
MAX
TYP
45
6
(3)
48S5.1500NT
20
60
30
40
200
6
78
220
72
6
(3)
530
0
85
24S12.900NT
8
36
20
70
50
0
86
0
35
70
6
80
220
85
260
6
8
24S15.700NT
48S3.2000NT
MIN
MAX
TYP
TYP
TYP
TYP
TYP
TYP
MAX
TYP
24
6
(3)
48S5.2000NT
36
72
50
50
270
6
83
260
6
84
48S12.900NT
48S15.700NT
280
90
70
7
78
070
7
78
12S3.2000NT
12S5.2000NT
9
8
440
45
00
2
82
220
45
060
5
83
40
45
340
7
82
12S12.900NT
12S15.700NT
24S3.2000NT
8
36
20
70
500
7
83
24S5.2000NT
Units
VDC
mA P-P
mA RMS
mA
%
kHz
VDC
ms
AMPS
Units
VDC
mA P-P
mA RMS
mA
%
kHz
VDC
ms
AMPS
Units
VDC
mA P-P
mA RMS
mA
%
kHz
VDC
ms
AMPS
(2)
To determine the correct fuse size, see CALEX Application Notes.
The case is tied to the -input pin.
Short term stability is specified after a 30 minute warmup at full load ,
constant line, and recording the drift over a 24 hour period.
The Transient response is specified as the time required to settle from
a 50 to 75 % step load change (rise time of step = 2µSec) to a %
error band.
Dynamic response is the peak overshoot voltage during the transient
as defined in note 6 above.
www.calex.com
Email: sales@calex.com
eco# 04007-,090309-, 00426-
Fax: 925-687-3333
10 Watt NT Single Series DC/DC Converters
Output Parameters (1)
Model
Output Voltage
Output Voltage Accuracy
Rated Load Range
Load Regulation
25% Max Load - Max Load
Line Regulation
Vin = Min-Max VDC
Short Term Stability (5)
Long Term Stability
Transient Response (6)
Dynamic Response (7)
Input Ripple Rejection (8)
Noise, Peak - Peak (2)
RMS Noise
Temperature Coefficient
Short Circuit Protection to Common for all
Outputs
(8)
(9)
The input ripple rejection is specified for DC to 120 Hz ripple with
a modulation amplitude of % Vin.
The functional temperature range is intended to give a additional
data point for use in evaluating this power supply. At the low
functional temperature the power supply will function with no
side effects, however, sustained operation at the high functional
temperature will reduce expected operational life. The data sheet
specifications are no guaranteed over the functional temperature
range.
MIN
TYP
MAX
MIN
MAX
TYP
MAX
TYP
MAX
TYP
MAX
TYP
TYP
TYP
TYP
TYP
TYP
TYP
MAX
00
6
50
50
Continuous, Current Limit Protection
00
30
250
90
12S3.2000NT
24S3.2000NT
48S3.2000NT
3.33
3.30
3.33
3.36
0.2
2.0
0.
0.4
0.5
.0
12S5.2000NT
24S5.2000NT
48S5.2000NT
5
4.95
5.00
5.05
0.0
2.0
0.
0.4
0.0
0.2
12S12.900NT
24S12.900NT
48S12.900NT
2
.90
2.00
2.0
0.0
0.9
0.2
0.4
0.2
0.8
<0.05
<0.
250
250
>40
75
5
400
350
500
25
12S15.700NT
24S15.700NT
48S15.700NT
5
4.90
5.00
5.0
0.0
0.7
0.2
0.4
0.2
0.8
48S5.1500NT
5
4.95
5.00
5.05
0.0
.5
0.
0.3
0.0
0.2
Units
VDC
VDC
A
%
%
%/24 Hrs
%/kHrs
µs
mV peak
dB
mV P-P
mV RMS
ppm/ºC
General Specifications
All Models
Isolation (4)
Isolation Voltage
Input-Output 2S, 24S
Input-Output 48S
0µA Leakage
Input to Output
Capacitance
Environmental
Case Operating Range
No Derating
Case Functional Range (9)
Storage Range
Thermal Impedance (0)
General
Unit Weight
Mounting Kits
TYP
.0
oz
MS6, MS8 & MS5
MIN
MAX
MIN
MAX
MIN
MAX
TYP
-40
90
-50
00
-55
05
5
ºC
ºC
ºC
ºC/Watt
MIN
MIN
TYP
700
544
400
VDC
pF
Units
(10) The case thermal impedance is specified as the case temperature
rise over ambient per package watt dissipated.
(11) Specifications subject to change without notice.
(2) Water Washability - Calex DC/DC converters are designed
to withstand most solder/wash processes. Careful attention
should be used when assessing the applicability in your specific
manufacturing process.
Converters are not hermetically
sealed.
(3) RoHS Compliance -
See Calex website www.calex.com/RoHS.html for the complete
RoHS compliance statement.
The RoHS marking is as follows.
TOLERANCE: ALL DIMENSIONS ARE TYPICAL IN
INCHES UNLESS OTHERWISE NOTED:
X.XX
X.XXX
±0.020
±0.005
Pin
2
3
4
Function
+INPUT
-INPUT
+OUTPUT
CMN
240 Stanwell Drive, Concord Ca. 94520
Ph: 925-687-44
3
Fax: 925-687-3333
www.calex.com
Email: sales@calex.com
eco# 04007-,090309-, 00426-
10 Watt NT Single Series DC/DC Converters
Application Information
General Information
Adequate heat sinking and full filtering on both the input and
output are included in he 0 Watt NT Single Series, preventing
the need for additional components and head sinking in most
applications.
Full overload protection is provided by independent pulse-by-
pulse current limiting. These protection freatures assure you
that our 0 Watt Single will provide zero failure rate operation.
A fully five-sided shielded, sealed, water washable case is
standard along with specified operation over the full industrial
temperature range of -40 to +90 ºC.
Applying the Input
Figure shows the recommended connections for the 0 Watt
NT Single DC/DC converter. A fuse is recommended to protect
the input circuit and should not be omitted. The fuse serves an
important purpose in preventing unlimited current from flowing
in the case of a catastrophic system failure. See our application
note on input fuse selection for more information.
No external capacitance on the input is required for normal
operation in fact, it can degrade the converter’s performance.
If extra filtering is desired on the input, see the low noise input
circuit in Figure 2.
Extremely low ESR capacitors (<0.25 ohms) should not be used
at the input. This will cause peaking of the input filter’s transfer
function and actually degrade the filter’s performance.
If desired, extra transient overvoltage protection may be added
directly at the converter’s input pins as shown in Figure .
No external capacitance on the output is required for normal
operation. In fact, it can degrade the converter’s performance.
See our application note “Understanding DC/DC Converters
Output Impedance” and the low noise circuits for more
information. The usual to 0 µF aluminum or tantalum and
0. to 0.00 µF bypasses may be used around your PCB as
required without harm.
Extra transient overvoltage protection may be added directly
at the converter’s output pins as shown in Figure .
½
½
½
½
Figure 2.
For very low noise applications the circuits shown above can be
used. The input current ripple will be reduced approximately 30
dB of the original value while the output noise will be reduced
to below 0 mV P-P. Do not use the biggest ESR capacitors
that you can find in these circuits. Large capacitors can cause
severe peaking in the filter’s transfer function and may actually
make the conducted noise worse.
Isolation - Case Grounding
The input and output sections are fully floating from each other.
They may be operated fully floating or with a common ground.
If the input and output sections are connected either directly
at the converter or at some remote location from the converter
it is suggested that a to 0 µF, 0.5 to 5 ohm ESR capacitor
be used directly at the converter output pins. This capacitor
prevents any common mode switching currents from showing
up at the converter’s output as normal mode output noise. Do
not use the lowest ESR, Biggest value capacitor that you can
find! This can only lead to reduced system performance or
oscillation.
The case serves not only as a head sink but also as an EMI
shield. The 0.06 inch thick copper provides >25 dB of
absorption loss to both electromagnetic and electric fields at
200 kHz, while at the same time providing about 30% more
effective heat sinking than competitive 0.0 inch thick steel
cases.
The case shield is tied to the -input pin. This connection is
shown on the block diagram. The case is floating from output,
coupled only by the 400 pF of isolation capacitance. This low
capacitance insures that any AC common mode noise on the
inputs is not transferred to your output circuits.
Compare this isolation capacitance vale to the 600 to 2000 pF
found on competitive designs and you’ll see that with CALEX
you are getting the best DC and AC isolation available. After
all, you are buying an isolated DC/DC converter to cut ground
loops. Don’t let the isolation capacitance add them back in.
Fax: 925-687-3333
4
www.calex.com
Email: sales@calex.com
eco# 04007-,090309-, 00426-
Figure 1.
Standard connections for the 0 Watt NT Single. The input fuse
should not be omitted. The overvoltage diodes D and D2 may be
added to the circuit directly at the converter to provide transient
protection to your circuit.
Applying the Output
The output is simply connected to your application circuit and
away you go! If extra low output noise is required for your
application the circuit shown in Figure 2 may be used to reduce
the output noise to below 0 mV P-P.
240 Stanwell Drive, Concord Ca. 94520
Ph: 925-687-44
10 Watt NT Single Series DC/DC Converters
Temperature Derating
The NT Single series can operate up to 90ºC case temperature
with derating. Case temperature may be roughly calculated
from ambient by knowing that the 0 Watt NT Singles case
temperature rise is approximately 0ºC per package watt
dissipated.
For example: if a 24 Volt input converter was delivering 7 Watts
at 24 Volts input, at what ambient could it expect to run with no
moving air and no extra sinking.
Efficiency for the NT Single is approximately 84%. Check the
product curves for exact information. This leads to an input
power of about 8.3 Watts. There fore, the case dissipation is
8.3 Watts (input power) minus 7 Watts (output power) or .3
Watts. The case temperature rise would be .3 Watts x 5 =
20 ºC. This number is subtracted from the maximum case
temperature of 90ºC to get 70ºC.
This is a rough approximation of the maximum ambient
temperature. Because of the difficulty of defining ambient
temperature and the possibility that the load’s dissipation may
actually increase the local ambient temperature significantly or
the convection cooling is suppressed by physical placement
of the module, these calculations should be verified by actual
measurement of operating temperature and your circuit’s exact
efficiency (efficiency depends on both line input and load value
before committing to a production design.
Typical Performance (Tc=25ºC, Vin=Nom VDC, Rated Load).
Data for 12 Volt Input Models
24 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
0.8
12 VOLT EFFICIENCY Vs. LOAD
85
85
12 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
INPUT CURRENT (AMPS)
0.6
80
LINE =
9VDC
50% FULL LOAD
84
100% LOAD
0.4
EFFICIENCY (%)
EFFICIENCY(%)
83
75
100% FULL LOAD
82
50% LOAD
0.2
LINE =
12VDC
70
81
LINE =
18VDC
0.0
4
8
12
16
20
24
28
32
36
65
0
10
20
30
40
50
60
70
80
90
100
80
9
10
11
12
13
14
15
16
17
18
LINE INPUT (VOLTS)
LOAD (%)
LINE INPUT(VOLTS)
Data for 24 Volt Input Models
12 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
1.5
24 VOLT EFFICIENCY Vs. LOAD
90
88
24 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
INPUT CURRENT (AMPS)
85
EFFICIENCY (%)
1.0
80
EFFICIENCY(%)
100% LOAD
LINE =
18VDC
86
100% FULL LOAD
75
84
0.5
50% LOAD
70
LINE =
24VDC
LINE =
36VDC
0
10
20
30
40
50
60
70
80
90
100
50% FULL LOAD
82
65
0.0
4
6
8
10
12
14
16
18
60
80
18
20
22
24
26
28
30
32
34
36
LINE INPUT (VOLTS)
LOAD (%)
LINE INPUT(VOLTS)
240 Stanwell Drive, Concord Ca. 94520
Ph: 925-687-44
5
Fax: 925-687-3333
www.calex.com
Email: sales@calex.com
eco# 04007-,090309-, 00426-
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