55 Watt K Triple Series DC/DC Converters
Features
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Description
The 55 Watt Triple Series consists of separate power sections
for the single and dual outputs. These power sections are
operated in anti-phase to each other to reduce the ripple
current stress on the input components and the reflected input
ripple. The main benefit of two separate power sections is the
excellent regulation achieved by all outputs. An order of
magnitude regulation improvement is obtained over
competitive designs. There is no cross regulation between +5
output and the dual outputs. This means that the dual output
voltages are independent of the +5 Volt loading and visa
versa.
Excellent noise performance is attained by using a 0.040
inch thick aluminum case, pot core and toroidal magnetics,
double shielded transformers and both normal mode and
common mode input filtering.
The input and outputs are protected from overvoltage by
transient voltage suppressor diodes. The outputs are protected
from faults with pulse by pulse digital current limiting.
Very Low Noise, < 50 mV P-P Maximum
PCB Mounting with Optional Heat Sink or
Chassis Mount Versions
Efficiencies to 87%
Common and Differential Mode Input Filtering
Remote Sense On +5 Volt Output
Single and Dual Outputs are Isolated From
Each Other
No derating to 80°C Case Temperature
Five Year Warranty
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Selection Chart
Model
12T5.12K
12T5.15K
24T5.12K
24T5.15K
48T5.12K
48T5.15K
Input Range
VDC
Min
Max
9.0
9.0
18.0
18.0
36.0
36.0
18.0
18.0
36.0
36.0
72.0
72.0
Outputs
VDC
5, ±12
5, ±15
5, ±12
5, ±15
5, ±12
5, ±15
Outputs
mA
5000, ±1250
5000, ±1000
5000, ±1250
5000, ±1000
5000, ±1250
5000, ±1000
55 Watt Triple Series Block Diagram
DOUBLE SHIELDED
ISOLATION TRANSFORMER
THERMAL SHUTDOWN
SINGLE SECTION
10 +5V OUTPUT
A
+ INPUT 4
+ INPUT 5
COMMON &
DIFFERENTIAL
MODE INPUT
FILTER
ANTI-PHASE
DUAL PWM
CONTROLLER
9 +5 CMN
11 +5V SENSE
- INPUT 2
- INPUT 3
ON/OFF 6
ISOLATION
BARRIER
8 +5V CMN SENSE
14 +DUAL OUTPUT
13 DUAL CMN
1.5M || 0.01µF
CASE 7
SHIELDED, LOW THERMAL GRADIENT
ALUMINUM CASE
12 -DUAL OUTPUT
DUAL SECTION
Manufacturing Company, Inc.
• Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
1
55 Watt K Triple Series DC/DC Converters
Input Parameters*
Model
Voltage Range
Reflected Ripple (2), 0-20MHz bw
Input Current Full Load
No Load
Efficiency
Switching Frequency
Maximum Input Overvoltage, 100ms
No Damage
Turn-on Time, 1% Output Error
Recommended Fuse
MIN
MAX
TYP
MAX
TYP
TYP
TYP
TYP
MAX
TYP
23
12T5.12K
12T5.15K
24T5.12K
9.0
18.0
110
250
5630
50
81
24T5.15K
18.0
36.0
60
150
2715
35
85
80
45
70
(3)
85
38T5.12K
48T5.15K
36.0
72.0
35
80
1325
30
87
Units
VDC
mA P-P
mA
%
kHz
VDC
ms
AMPS
Output Parameters*
Model
Output Voltage
Rated Current (4)
Voltage Range
100% Load (5)
Output Balance
(Plus to Minus Output, Full Load)
Load Regulation 25%-100%
1-100%
Cross Regulation (6)
Line Regulation
Vin = Min-Max VDC
Short Term Stability (7)
Long Term Stability
Transient Response (8)
Dynamic Response (9)
Input Ripple Rejection (10)
Noise, 0-20MHz bw
Temperature Coefficient
Overvoltage Clamp (11)
Short Circuit Protection to
Common for all Outputs
MIN
MAX
MIN
TYP
MAX
TYP
MAX
TYP
MAX
TYP
MAX
TYP
MAX
TYP
MAX
TYP
TYP
TYP
TYP
TYP
TYP
MAX
TYP
MAX
TYP
12T5.12K
24T5.12K
48T5.12K
12T5.15K
24T5.15K
48T5.15K
12T5.12K 24T5.12K
48T5.12K
±12
310
1250
11.925
12.000
12.075
0.5
0.7
0.8
1.2
2.0
4.0
0.8
1.2
0.02
0.2
0.02
12T5.15K 24T5.15K
48T5.15K
±15
250
1000
14.925
15.000
15.075
0.5
0.7
0.7
1.2
2.0
4.0
0.7
1.2
Units
VDC
mA
A
%
+5
50
5000
4.950
5.000
5.050
N/A
0.02
0.2
0.02
0.2
N/A
N/A
%
%
%
%
0.2
%/kHrs
500
400
400
µs
250
250
200
mV peak
25
15
15
dB
15
mV P-P
50
50
50
50
ppm/°C
100
200
200
6.8
15
18
VDC
Provides minimum of 8 hours continuous protection with current limiting and
thermal overload techniques
A
NOTES
measured at Tc = 25 °C, nominal input
*
All parameters rated load unless otherwise noted. Refer to
voltage and full
the CALEX Application Notes for the definition of terms,
measurement circuits and other information.
(2) Noise is measured per CALEX Application Notes. Measurement
bandwidth is 0 - 20 MHz.
(3) Determine the correct fuse size by calculating the maximum DC
current drain at low line input, maximum load and then adding
20 to 25% to get the desired fuse size. A slow blow type fuse is
recommended. For reverse voltage protection on the input this
fuse must be used.
(4) Minimum load is required for rated regulation only, no module
damage will occur if the output is run at less than minimum load.
Maximum output power on the dual section is 30 Watts (i.e. one
output can draw 30 Watts and the other 0 Watts). Regulation
degrades with substantial loading unbalance.
The remote sense pins must be connected to their respective
output pins for proper output voltage and regulation. The combined
drop on each output line to it’s respective remote sense pin must
be less than 0.3 volts or 0.6 volts for both sense lines combined.
(6) Cross regulation is defined as the change in one output when the
other output is changed from minimum to maximum load.
(7) Short term stability is specified after a 30 minute warm-up at full
load, constant line, load and ambient conditions.
(8) Transient response is defined as the time for the output to settle
from a 50 to 75% step load change to a 2% error band (rise time
of step = 2µ Sec).
(9) Dynamic response is defined as the peak overshoot during a
transient as defined in note 8 above.
(10) The input ripple rejection is specified for DC to 120 Hz ripple with
a modulation amplitude of 1% of Vin.
(5)
Manufacturing Company, Inc.
• Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
2
55 Watt K Triple Series DC/DC Converters
General Specifications*
All Models
ON/OFF Function (12)
ON Logic Level
MIN
or Leave Pin Open
OFF Logic Level
MAX
Input Resistance
TYP
Converter Idle Current,
TYP
ON/OFF Pin Low
Isolation
Isolation Voltage
Input to Either Output
MIN
Single to Dual Output
MIN
Input-Case
MIN
Either Output to Case
MIN
10µA Leakage
Input to Output Capacitance
Input to Single Output
TYP
Input to Dual Output
TYP
Single to Dual Output
TYP
Environmental
Case Operating Range
MIN
No Derating
MAX
MIN
Case Funtional Range (13)
MAX
MIN
Storage Range
MAX
Thermal Impedance (14)
Pin Mount Version
TYP
Option -HS (Heat Sink)
TYP
Option -CM (Chassis
Mount)
Thermal Shutdown
TYP
Case Temperature
General
Unit Weight
Mounting Kits
Units
Heat Sink Option (-HS suffix)
4.5
1.2
2
25
VDC
VDC
k ohms
mA
1544
700
250
1544
VDC
100
150
75
-25
80
-40
90
-40
100
2.7
1.8
(14)
90
BOTTOM VIEW
pF
°C
°C
°C
Chassis Mount Option (-CM suffix)
°C/Watt
°C
14
See Case Options
oz.
(11) For module protection only, see also note 3.
(12) The ON/OFF pin is Open Collector TTL, CMOS, and relay
compatible. The input to this pin is referenced to -Input (pin 2).
(13) The functional temperature range is intended to give an 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 not guaranteed over the functional
temperature range.
(14) The case thermal impedance is specified as the case temperature
rise over ambient per package watt dissipated. The thermal
resistance of the Chassis Mount version depends on the mounting
surface. If the mounting surface is a poor thermal conductor the
thermal resistance can be as high as 2.7° C/watt. If the mounting
surface is an excellent thermal conductor the thermal resistance
can be below 1°C/watt.
A
Mechanical tolerances unless otherwise noted:
X.XX dimensions: ±0.020 inches
X.XXX dimensions: ±0.005 inches
Seal around terminals is not hermetic. Do not immerse units in any
liquid.
Mounting Configuration Options
To order the optional heat sink on the pin mount version place
a “-HS” suffix on the part number. To order the chassis mount
version place a “-CM” suffix on the part number. The heat sink
and chassis mount options cannot be used together.
Pin
1
2
3
4
5
6
7
Function
NO PIN
-INPUT
-INPUT
+INPUT
+INPUT
ON/OFF
CASE
Pin
8
9
10
11
12
13
14
Function
+5V CMN SENSE
+5V CMN
+5V OUTPUT
+5V SENSE
-DUAL OUTPUT
DUAL CMN
+DUAL OUTPUT
Manufacturing Company, Inc.
• Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
3
55 Watt K Triple Series DC/DC Converters
Application Guidelines
Inputs
The input should be fused as per note number 3. The case is
connected to the -INPUT pins through 1.5 Megohms in
parallel with 0.01µF. The case may be left floating in most
applications. The noise performance of the converter may
improve or degrade with the case connected to other inputs or
outputs depending on your system grounding.
The remote ON/OFF pin may be left floating if it is not used.
See “Understanding the Remote ON/OFF Function” application
note for more information on this feature.
The dual input pins (2,3 and 4,5) should be paralleled to
share the input current. Figure 1 shows the recommended
input connections.
FUSE
4
+INPUT
5
SOURCE
2
-INPUT
3
DUAL CMN 13
-LOAD
-DUAL OUTPUT 12
+DUAL OUTPUT 14
+LOAD
Dual Output
The dual outputs are cross regulated to each other but
independent of the loading on the single output. The dual
output uses a cross regulation scheme where the plus and
minus output voltage is regulated as an average voltage. This
allows improved regulation on both outputs. If the outputs are
loaded equally and the regulation is checked, then the apparent
regulation is much closer to 0.5%. This data shows the worst
case result of changing each output independently. The
output common on the dual section is electrically isolated from
the +5 volt section to aid in proper system grounding. If 24
volts or 30 volts are required, then the appropriate output can
be connected to the system ground and the output current can
be taken from the other output. In this situation the dual
section’s common pin (Pin 13) should be left unconnected.
Full output power (30 watts) is available in this configuration.
Figure 3 shows the dual output connections.
Figure 1.
Parallel both + and -INPUT pins. Fusing the input is recommended.
Single Output
The single output is independent of the loading on the dual
output section. The single output also features provisions for
remote sense connections. These allow the power supply to
correct for line drops of up to 0.3 volts per leg or 0.6 volts total.
The remote sense connections should be made with twisted
pair wire or closely coupled PCB traces. There is approximately
2mA of current flowing in the remote sense lines. If the remote
sense is not to be used, these pins must be connected to their
respective output pins for proper output voltage accuracy and
regulation. See “Applying the Remote Sense and Trim
Functions On DC/DC Converters” application note for more
information. The output common on the single section is
electrically isolated from the dual section to aid in proper
system grounding. Figure 2 shows the single output
connections with remote sense.
+5V OUTPUT 10
+5V SENSE 11
LOAD
+5V CMN SENSE 8
+5V CMN 9
Figure 3.
The dual outputs can also be used with substantial unbalance and
as single-ended outputs by leaving Pin 13 unconnected.
Mounting Guidelines
The 55 Watt Triple Series can be supplied in either a pin mount
version or a chassis mount (screw terminal) version. It is
suggested that when using the pin mount version, the 4-40
hold down screws provided in the bottom of the case be used
to secure the unit to the PCB. These screws should be
tightened before soldering to avoid solder joint stress.
The chassis mount version can be mounted on its back
with the four 4-40 hold down screws provided. The mounting
surface should be flat to within 0.01 inches to prevent warping
the case. The mounting can then serve as additional heat
sinking. For optimum heat sinking, silicone grease is
recommended over the so called “dry pads.” Additional heat
sinking will lower internal temperatures and increase the
expected life. When chassis mounting remember that the
case is connected to the - INPUT pins through 1.5 Megohms
in parallel with 0.01µF. The breakthrough voltage of this
connection is greater than 250VDC.
A
Figure 2.
The remote sense pins must be connected to their respective
outputs. If the remote sense feature is not used, connect the sense
pins to their outputs directly at the converter.
The “-HS” heat sink option lowers the thermal resistance
from 2.7 to 1.8°C/Watt dissipated. It also increases the heat
removing efficiency of any cooling air flow. If the 55 Watt Triple
is to be placed in a small enclosure where the power delivered
to the load or the power dissipated in the 55 Watt Triple
converter can raise the ambient temperature then care must
be taken to insure that the case temperature does not exceed
the 80°C limit for proper operation.
Manufacturing Company, Inc.
• Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
4
55 Watt K Triple Series DC/DC Converters
Typical Performance (Tc=25°C, Vin=48 VDC, Rated Load).
12T5.XXK EFFICIENCY Vs. LOAD
86
84
82
12T5.XXK EFFICIENCY Vs. LINE INPUT
85
84
83
82
LINE = 12VDC
50% FULL LOAD
EFFICIENCY (%)
80
LINE =
78
76
74
72
70
10
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
LINE =
18VDC
9VDC
100% FULL LOAD
81
80
79
78
9
10
11
12
13
14
15
16
17
18
LOAD (%)
LINE INPUT (VOLTS)
12T5.XXK INPUT CURRENT Vs. LINE INPUT VOLTAGE
9
8
90
24T5.XXK EFFICIENCY Vs. LOAD
LINE = 24VDC
LINE = 18VDC
85
INPUT CURRENT (AMPS)
7
6
5
4
3
2
1
0
6
8
10
12
14
16
18
100% FULL LOAD
EFFICIENCY (%)
80
50% FULL LOAD
75
LINE = 36VDC
70
65
10
20
30
40
50
60
70
80
90
100
LINE INPUT (VOLTS)
LOAD (%)
24T5.XXK EFFICIENCY Vs. LINE INPUT
87
4.0
24T5.XXK INPUT CURRENT Vs. LINE INPUT VOLTAGE
50% FULL LOAD
86
INPUT CURRENT (AMPS)
3.0
EFFICIENCY (%)
A
50% FULL LOAD
100% FULL LOAD
85
2.0
100% FULL LOAD
84
1.0
83
18
20
22
24
26
28
30
32
34
36
0.0
5
10
15
20
25
30
35
40
LINE INPUT (VOLTS)
LINE INPUT (VOLTS)
Manufacturing Company, Inc.
• Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
5
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