A
1 Watt SLC Single Series DC/DC Converters
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, eco# 011007-1
1 Watt SLC Series Block Diagram
Description
The CALEX SLC is specifically designed to provide
nonstandard output voltages and isolation for 5 volt digital
systems. The series provides semi-regulated outputs of 5, 6,
12, 15, and 24 volts for directly driving your circuits or 7, 14 and
17 volt outputs for driving three terminal regulators.
The high efficiency operation of typically 74% for a 12 volt
output means efficient use of your system power.
Easy four terminal operation makes using the converter a
snap. Just plug it in and you are ready to solve those nasty
analog problems that arise when only 5 volt digital power is
available in your system.
Features
Low Cost
Operating Range of 4.5 to 5.5 Volts
Semi-Regulated 1 Watt Outputs
5, 12, 15 and 6, 7, 14, 17, 24 Volt Outputs
Simple Four Terminal Operation
Small SLC package, Fits in 0.19 sq.in. of PCB Area
Low Noise Operation
5 Year Warranty
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A
1 Watt SLC Single Series DC/DC Converters
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, eco# 011007-1
NOTES
*
All parameters measured at Tc = 25C, 5.00V input voltage,
full rated load and a 10F solid tantalum capacitor connected
across the input and output pins, unless otherwise noted.
Refer to the CALEX Application Notes for the definition of
terms, measurement and other information.
(1)
Noise is measured per CALEX Application Notes. Measurement
bandwidth is 20 MHz. Input Reflected Ripple and output noise
are measured with a 10F tantalum capacitor connected across
the input and output pins.
(2)
Output Voltage Accuracy measured at 75% of maximum Rated
Load.
(3)
Load Regulations measured relative to 75% of maximum Rated
Load Current. See Output Voltage vs. Output Load Curves.
(4)
Line Regulation is for a 1.0% change in Input Voltage.
(5)
Use input fuse for protection. See Applying the Input.
(6)
The case Thermal Impedance is specified as the case
temperature rise over ambient per package watt dissipated.
(7)
Specifications subject to change without notice.
(8)
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.
General Information
The 1 Watt SLC series provides isolated semi-regulated
outputs of 5, 6, 7, 12, 14, 15, 17, and 24 VDC. The high
efficiency low noise push-pull design operates at 165 kHz
which reduces to a minimum your external filter requirements.
The converter is packaged in a non-conductive plastic case
and can be water washed after assembled to your main PC
board.
Applying The Input
Figure 1 shows the recommended input connections for the 1
Watt Output SLC series. This series is only protected for
momentary output short circuits to common so a fast acting
fuse is recommended to protect the input circuit. It should not
be omitted as it serves to prevent unlimited current from
flowing in the case of an overcurrent at the load.
C1 may not be required when the power source is less than
2" from the unit. The source impedance should be less than
Figure 1. 1 Watt SLC Series Typical Application
0.5 ohm over the frequency range of DC to 165 kHz. A 10F
solid tantalum capacitor will satisfy the requirements for C1,
and should be within 2" of the converter.
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1 Watt SLC Single Series DC/DC Converters
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, eco# 011007-1
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inductor L2 appropriately for the maximum expected load
current. All the ground connections must be as short as
possible back to the CMN pin. The filter should be placed as
close as possible to the converter, even if your load is at some
distance.
Figure 3.
This circuit can reduce the output noise to below 4mV P-P over a 20
MHz bw. Size L2 for the maximum expected load current. Place as
close as possible to the converter.
Negative Outputs
A negative output voltage is obtained by connecting the
+Output pin to the low side of the load, and taking the negative
output from the CMN pin of the converter.
Grounding
The input and output sections are fully floating and isolated
from each other. They may be operated fully floating or with
a common connection between the input and output.
Mechanical tolerances unless otherwise noted:
X.XX dimensions: 0.020 inches
X.XXX dimensions: 0.010 inches
Very Low Noise Input Circuit
Figure 2 shows a very low noise input circuit that may be used
with the converters. This circuit will reduce the input reflected
ripple current to less than 5 mA peak to peak. L1 should be
sized to handle the maximum DC current of your application.
C1 must be used if L1 is required in the circuit.
Figure 2.
This circuit will reduce the input reflected ripple current to less than
5 mA peak to peak. See the discussion in the text for selecting C1
and L1.
Applying The Output
Figure 1 shows the typical output connection for the converter.
C2 is required to filter the output. It must be 10F minimum
and can be made up of from the bypass capacitors already
used in your application. Increasing C2 will lower the output
noise.
Operation With Light Loads
This converter uses a semi-regulated design. The output
voltage will vary as the load is changed, increasing as the load
is decreased. See the Output Voltage vs. Output Load curve.
Operation With Changing Input Voltage
The output will change proportionally to a change in the input
voltage. The typical output voltage change is 1.2% per %
change in input voltage.
Low Noise Output Circuit
The circuit shown in Figure 3 can be used to reduce the output
noise to below 4 mV p-p over a 20 MHz bandwidth. Size
L1 = 5H
C1 = 10F
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1 Watt SLC Single Series DC/DC Converters
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, eco# 011007-1
0
20
40
60
80
OUTPUT LOAD (mA)
14.10
14.70
15.30
15.90
16.50
OUTPUT VOLTAGE (VOLTS)
0
20
40
60
80
OUTPUT LOAD (mA)
16.00
16.50
17.00
17.50
18.00
18.50
OUTPUT VOLTAGE (VOLTS)
0
20
40
60
80
100
% OF RATED LOAD (%)
0
20
40
60
80
EFFIECIENCY (%)
5-7 VOLT OUTPUT
12-17 VOLT OUTPUT
0
10
20
30
40
50
OUTPUT LOAD (mA)
23.50
24.00
24.50
25.00
25.50
26.00
26.50
OUTPUT VOLTAGE (VOLTS)
0
20
40
60
80
OUTPUT LOAD (mA)
13.40
13.80
14.20
14.60
15.00
15.40
OUTPUT VOLTAGE (VOLTS)
Temperature Derating
The 1 Watt Output SLC series can be operated up to a +85C
case temperature. Case temperature can be roughly calculated
from ambient by knowing that the case temperature rise is
approximately 58C per package watt dissipated.
For example: If a 5S12.080SLC is delivering 0.9 watts at 5V
input, at what ambient could it expect to run with no additional
cooling such as moving air?
Efficiency is approximately 73% which leads to an input
power of 1.23 watts. The internal power loss is 1.23 - .9 = 0.33
watts. The case temperature rise will be 0.33W x 58C/
W=19.1C. This number is subtracted from the maximum
case temperature rating of 85C to get 65.9C, which is the
maximum ambient operating temperature.
This example calculation is for an application with no extra
air flow for cooling. Extra cooling air will greatly effect the
maximum ambient temperature. Exact internal power loss
depends upon the efficiency, input voltage, and load in the
application.
The above example is a rough approximation to the
maximum ambient temperature. Because of the difficulty of
defining ambient temperature, these calculations should be
verified by actual measurement before committing to a
production design.
0
30
60
90
OUTPUT LOAD (mA)
11.50
12.00
12.50
13.00
13.50
OUTPUT VOLTAGE (VOLTS)
0
40
80
120
160
OUTPUT LOAD (mA)
4.60
4.80
5.00
5.20
5.40
5.60
5.80
OUTPUT VOLTAGE (VOLTS)
0
40
80
120
160
OUTPUT LOAD (mA)
6.40
6.70
7.00
7.30
7.60
7.90
OUTPUT VOLTAGE (VOLTS)
Typical Performance: (Tc=25C)
20
40
60
80
100
120
140
160
OUTPUT LOAD (mA)
5.50
6.00
6.50
7.00
7.50
OUTPUT VOLTAGE (VOLTS)
OUTPUT VOLTAGE Vs. OUTPUT LOAD
5S5.150SLC
OUTPUT VOLTAGE Vs. OUTPUT LOAD
5S6.145SLC
OUTPUT VOLTAGE Vs. OUTPUT LOAD
5S7.140SLC
OUTPUT VOLTAGE Vs. OUTPUT LOAD
5S12.080SLC
OUTPUT VOLTAGE Vs. OUTPUT LOAD
5S14.070SLC
OUTPUT VOLTAGE Vs. OUTPUT LOAD
5S15.065SLC
OUTPUT VOLTAGE Vs. OUTPUT LOAD
5S17.060SLC
EFFICIENCY Vs. OUTPUT LOAD
OUTPUT VOLTAGE Vs. OUTPUT LOAD
5S24.040SLC
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