27 to 30 Watt LE Triple Series DC/DC Converters
Features
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Triple Output
Wide 4:1 Input Voltage Range
(9-36 or 18-72 VDC)
High Efficiency, up to 85%
No Derating to 85°C Case Temperature
LC Input Filter, Dual Section Output Filters
PCB Mounting With Optional Heat Sink and
Chassis Mounting Kit
Five Year Warranty
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Description
The 4:1 input range of the LE Triple Series makes them ideal
for a wide variety of power requirements including battery and
unregulated input applications. Each converter’s +5V is
tightly regulated and useful for driving standard logic circuits.
These 27-30 Watt converters have dual output filters. They
provide a low output noise of 50 mV P-P typical and are fully
specified and tested to the maximum specifications. Input
filtering significantly reduces the reflected ripple noise.
Unlike comparable converters, all inputs and outputs are
protected from transient overvoltage conditions. Overload
protection is provided by current sensing of the primary
switching current and an independent thermal sensor. The
27-30 Watt Triple Series, like all CALEX converters, carries
the full 5 Year CALEX Warranty.
27-30 Watt Triple Series Block Diagram
Selection Chart
Model
12T5.12LE
12T5.15LE
48T5.12LE
48T5.15LE
Input Range
VDC
Min
Max
9
9
18
18
36
36
72
72
Outputs
VDC
5, ±12
5, ±15
5, ±12
5, ±15
Outputs
mA
3000, ±500
3000, ±400
3000, ±625
3000, ±500
A
2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
1
3/2001
27 to 30 Watt LE 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
Recommended Fuse
MIN
MAX
TYP
TYP
TYP
TYP
TYP
MAX
TYP
45
60
(3)
12T5.12LE
9.0
36.0
200
2715
12
83
100
85
45
12T5.15LE
48T5.12LE
18.0
72.0
165
735
14
85
48T5.15LE
Units
VDC
mA P-P
mA
%
kHz
VDC
mSec
AMPS
Output Parameters*
Model
Output Voltage
Rated Load (4)
Voltage Range
100% Load
Output Balance
(Plus to Minus Output, Full Load)
Load Regulation Min-Max (5)
Cross Regulation (6)
Line Regulation
Vin = Min-Max VDC
Short Term Stability (7)
Long Term Stability
Transient Response (8)
Dynamic Response (9)
Noise, 0-20MHz bw (10)
Temperature Coefficient
Overvoltage Clamp (11)
Short Circuit Protection to
CMN for all Outputs
MIN
MAX
MIN
TYP
MAX
TYP
TYP
MAX
TYP
TYP
MAX
TYP
TYP
TYP
TYP
TYP
MAX
TYP
MAX
TYP
12T5.12LE
48T5.12LE
12T5.15LE
48T5.15LE
12T5.12LE
48T5.12LE
12T5.15LE
48T5.15LE
Units
VDC
125
500
14.500
15.000
15.500
0.3
1.1
3.0
3.1
0.3
1.0
< 0.1
< 0.3
Never Exceeds 1%
mA
VDC
%
%
%
%
%
%/kHrs
µSec
mV peak
mV P-P
ppm/°C
VDC
+5
750
3000
4.950
5.000
5.050
N/A
1.2
2.0
0.3
0.1
0.5
< 0.02
< 0.2
350
130
50
100
50
150
6.8
±12
125
500
11.600
12.000
12.400
0.3
1.5
3.0
3.1
0.3
1.0
< 0.1
< 0.3
Never Exceeds 1%
160
625
100
400
±15
60
60
35
35
70
70
50
50
200
200
15
18
Provides continuous protection with current limiting and
thermal overload techniques
(7)
(8)
NOTES
*
All parameters measured at Tc=25°C, 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.
(2) Noise is measured per CALEX Application Notes found in the
CALEX Power Conversion Design Guide & Catalog.
Measurement bandwidth is 0 - 20 MHz. See the applications
section of this note for more information. Input reflected ripple is
measured with a 3.3 to 33µF, 0.5 to 5 ohm ESR, 100 Volt
aluminum electrolytic capacitor connected directly across the
input pins.
(3) Refer to the CALEX Application Notes for information on fusing.
(4) Optimum performance is obtained when this power supply is
operated within the minimum to maximum load specifications.
With other load currents the output voltage may be outside of the
specification limits. Tests should be run for the specific
application.
(5) Dual output regulation is specified by simultaneously changing
both ±12V or ±15V outputs from minimum to maximum load and
noting the change in each output.
(6) Cross regulation is defined as the change in one output when
only one of the other outputs is changed from maximum to
minimum load.
(9)
(10)
(11)
(12)
(13)
(14)
Short term stability is specified after a 30 minute warm up at full
load, constant line, load and ambient conditions.
Transient response is defined as the time for the output to settle
from a 50 to 75% step load change to a 1% error band (rise time
of step = 2µs).
Dynamic response is defined as the peak overshoot during a
transient as defined in note 8 above.
A 1µF 35V Tantalum capacitor is connected from each output
pin to the CMN pin, directly at the converter. Noise is measured
per CALEX application notes. Measurement bandwidth is 0 -
20MHz.
500 Watt peak pulse power transient suppression diodes used.
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. Sustained operation at the high functional
temperature will reduce the expected operational life. The data
sheet specifications are not guaranteed over the functional
temperature range.
The case thermal impedance is specified as the case temperature
rise over ambient per package watt dissipated.
Specifications subject to change without notice.
A
2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
2
3/2001
27 to 30 Watt LE Triple Series DC/DC Converters
General Specifications*
All Models
Isolation
Isolation Voltage
Input to Output 12T
Input to Output 48T
10µA Leakage
Input to Output Capacitance
Environmental
Case Operating Range
No Derating
MIN
MIN
TYP
700
1544
350
-25
85
-40
90
-40
105
4.4
95
VDC
pF
Units
MIN
MAX
MIN
Case Functional Range (12)
MAX
MIN
Storage Range
MAX
Thermal Impedance (13)
TYP
Thermal Shutdown
TYP
Case Temperature
General
°C
°C
°C
°C/Watt
°C
BOTTOM VIEW
SIDE VIEW
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.
Pin
1
2
3
4
5
6
Function
+INPUT
-INPUT
+12/15V
CMN
-12/15V
+5V
Unit Weight
Mounting Options
MS9
- I Suffix on Part Number
- HS
7
oz
Chassis Mounting Kit
Inserts In Case
Heat Sink Option
Heat Sink Option
The 27-30 Watt Triple can be ordered with a “-I” configuration
which provides 3 inserts on the top surface of the case for
attaching a heat sink. When ordered with an “-HS”
configuration, CALEX will ship the converter with the heat sink
attached. The CALEX heat sink was specially developed for
this model and will reduce the case temperature rise to below
3.3°C/W with natural convection and even lower with moving
air.
Customer installed heat sinks may also be used. It is
recommended that only liquid heat sink compound be used on
the heat sink interface. Avoid so called “Dry” pad heat sink
materials. In our experience these materials are actually
worse than using no compound at all.
Chassis Mounting Kit - MS9
The MS9 chassis mounting kit allows for direct wire connection
through two barrier strips. The MS9 may be conveniently
attached to a chassis by using the 4-0.156 inch diameter
mounting holes provided in each corner.
Although the MS9 comes with solderless sockets, it is
recommended that the converter be soldered to the mounting
kit for improved reliability under severe environmental or
vibration conditions.
A
C1-C3=1µF/35V, TANTALUM
Typical Application
Figure 1 shows the recommended connections for the 27-30
Watt Triple DC/DC converter.
A fuse is recommended to prevent unlimited current flow in
the event of a system failure and to protect the DC/DC
converter input circuit.
2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
3
3/2001
27 to 30 Watt LE Triple Series DC/DC Converters
Figure 3.
Low Noise Input Filter Circuit
Case Grounding
L1-L3 =5µH
C1-C3 =1µF/35V, TANTALUM
C4-C6 =10µF/35V, TANTALUM
C7-C9 = 0.01µF, CERAMIC
Figure 2.
Low Noise Output Filter Circuit
The case serves not only as a heat sink but also as an EMI
shield. The case/header shield is tied to the +Input pin as
shown in the block diagram.
Temperature Derating / Mounting Options
The LE Triple Series can operate up to 85°C case temperature
without derating. The case temperature may be roughly
calculated from ambient by knowing that the LE Triple’s case
temperature rise is 4.4°C per package Watt dissipated. For
example, if the converter was functioning at an output of 30
Watts, at what ambient could it expect to run with no moving
air and no additional heat sinks?
Efficiency is approximately 85% which calculates to an
input power of 35 Watts. 35 - 30 = 5 Watts dissipated
internally in the package. The case temperature rise would be
5 Watts x 4.4 = 22°C. The 22°C is subtracted from the
maximum case temperature of 85°C so, in this example, the
unit can operate up to a 63°C ambient.
This is a rough approximation of the maximum ambient
temperature. Because of the difficulty of defining ambient and
the possibility that the load’s dissipation may actually increase
the local ambient temperature significantly, these calculations
should be verified by actual measurement before committing
to a production design.
12 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
5
Extra output filtering can be added to further reduce the
noise. The optional circuit shown in Figure 2 can reduce the
+5V noise to less than 10 mV P-P, and the ±V output noise to
less than 15 mV P-P. Use an inductor for L1 that is rated for
3 Amps DC minimum, and 650 mA DC minimum for L2 and L3.
Low Noise Input Filtering Circuit
The circuit of Fig 3 can be added to reduce the input reflected
ripple current to less than 50 mA P-P (12V models) and less
than 30 mA P-P (48V models). For L4, use a 5µH-4 Amp DC
inductor for 12V models, and a 20µH-2 Amp DC inductor for
48V models. C10 and C11 are 10µF/100V and can be nearly
any 105°C rated capacitor. To prevent input filter peaking the
ESR should be in range of 0.5 to 2 ohms. Do not use a low ESR
capacitor for this part as peaking of the filter’s transfer
function may occur and render the filter ineffective.
Typical Performance (Tc=25°C, Vin=Nom VDC, Rated Load).
12 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
90
90
12 VOLT EFFICIENCY Vs. LOAD
INPUT CURRENT(AMPS)
LINE = 12VDC
4
EFFICIENCY(%)
EFFICIENCY(%)
50% LOAD
85
LINE = 9VDC
3
A
100% LOAD
50% LOAD
85
100% LOAD
LINE = 36VDC
80
2
1
80
5
10
15
20
25
30
35
40
75
0
10
20
30
40
50
60
70
80
90
100
0
0
5
10
15
20
25
30
35
40
LINE INPUT(VOLTS)
LOAD(%)
LINE INPUT(VOLTS)
48 VOLT EFFICIENCY Vs. LINE INPUT VOLTAGE
90
48 VOLT EFFICIENCY Vs. LOAD
90
3
48 VOLT INPUT CURRENT Vs. LINE INPUT VOLTAGE
85
85
INPUT CURRENT(AMPS)
50% LOAD
EFFICIENCY(%)
EFFICIENCY(%)
100% LOAD
LINE = 18VDC
2
100% LOAD
1
80
80
50% LOAD
LINE = 48VDC
75
20
30
40
50
60
70
80
LINE = 72VDC
0
75
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
LINE INPUT(VOLTS)
LOAD(%)
LINE INPUT(VOLTS)
2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
4
3/2001
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