A
1 Watt SIP Dual 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# 041007-1
Features
3000 VDC Isolation Voltage
Operating Range of 4.5 to 5.5 Volts
Semi-Regulated 1 Watt Outputs
5, 12, 15 and 7, 14, 17 Volt Outputs
Simple Five Terminal Operation
Small SIP Package, Fits in 0.19 sq.in.
of PCB Area
Low Noise Operation
5 Year Warranty
Description
The CALEX SIP Dual is specifically designed to provide
bipolar output voltages and 3000 VDC isolation for 5 volt
digital systems. The series provides semi-regulated outputs
of 5, 12 and 15 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 five 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.
1 Watt SIP Dual Series Block Diagram
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A
1 Watt SIP Dual 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# 041007-1
General Information
The 1 Watt SIP series provides isolated, semi-regulated
outputs of 5, 7, 12, 14, 15, and 17 VDC. The high efficiency
low noise push-pull design operates at 350 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 being assembled to your PC board.
Applying The Input
Figure 1 shows the recommended input connections for the
SIP Dual series. C1 may not be required when the power
source is less than 2" from the unit. The source impedance
should be less than 0.5 ohm over the frequency range of DC
to 350 kHz. A 10F/10V solid Tantalum capacitor will satisfy
the requirements for C1, and should be placed as close to the
converter as possible.
NOTES
*
All parameters measured at Tc=25 C case temperature,
nominal input voltage and full rated load unless otherwise
noted. Refer to the CALEX Application Notes for
definition of terms, measurement circuits and other
information.
(1)
Noise is measured per CALEX Applications notes. All noise
measurements are made with a 10uF/35V Tantalum capacitor
connected directly across the input and outputs. Measurement
bandwidth is 0-20 MHz.
(2)
Output voltage accuracy is measured at 75% of maximum load.
(3)
Output balance is the percent difference in voltage from the plus
to the minus output at 75% of maximum load.
(4)
Load regulation is measured relative to 75% maximum load.
Load regulation is specified with both outputs changing
simultaneously.
(5)
Cross regulation is measured relative to 75% maximum load.
Cross regulation is measured by operating the +output at 75%
of maximum load and varying the -output as specified. The
change in the +output is the cross regulation.
(6)
Line regulation is for a 1% change in the input voltage.
(7)
Current limiting must be accomplished by using a current limited
source or fuse in the input circuit.
(8)
The case thermal impedance is specified as the case temperature
rise over ambient per package watt dissipated.
(9)
Specifications subject to change without notice.
(10) 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.
Figure 1.
Typical input and output connections for the SIP Dual series.
C1 = 10 F if converter is more than 2" from the main power source.
C2 = 2.2F minimum, 10 F typical, may be spread around your board.
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A
1 Watt SIP Dual 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# 041007-1
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Mechanical tolerances unless otherwise noted:
X.XX dimensions: 0.020 inches
X.XXX dimensions: 0.010 inches
Operation With Changing Input Voltage
The output will change proportionally to a change in the input
voltage. The typical output voltage change is 1.3% 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 8 mV p-p over a 20 MHz bandwidth. Size
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.
Single Ended Loads
The Sip Dual series may be operated in a single ended mode
to get 10, 14, 24, 28, 30 or 34 volt outputs. The circuit of Figure
4 should be used for single ended operation. The CMN pin
should be left floating from your application ground.
Output Short Circuit Protection
This series is only protected for momentary output short
circuits to common so a fast acting fuse or input current
limiting is recommended to protect the converter. If output
shorts are possible then the protection circuit should not be
omitted as it serves to prevent unlimited current from flowing
in the case of an overcurrent at the load.
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 10 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
10 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 for proper operation of the outputs. C2 should
be at least 2.2F minimum and can be made up of the bypass
capacitors already used in your application. A low ESR 10F
Tantalum capacitor is recommended. Decreasing the ESR of
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
for more information.
Figure 3.
This circuit can reduce the output noise to below 8mV P-P over a 20
MHz bandwidth. Size L2 for the maximum expected load current.
Place as close as possible to the converter.
C2, C3 = . 2.2 F, 10 F TYPICAL
L2 = 1 H - 5 H
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1 Watt SIP Dual 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# 041007-1
0
10
20
30
40
50
60
70
80
90
100
LOAD (%)
50
55
60
65
70
75
80
EFFICIENCY (%)
EFFICIENCY Vs. LOAD
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (VDC)
0.00
0.05
0.10
0.15
0.20
0.25
0.30
INPUT CURRENT (AMPS)
INPUT CURRENT Vs. INPUT VOLTAGE
from ambient by knowing that the case temperature rise is
approximately 58C per package watt dissipated.
For example: If a 5D12.040SIP 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 1.2 watts. The internal power loss is 1.2 - .9 = 0.30
watts. The case temperature rise will be 0.30W x 58C/W=
17C. This number is subtracted from the maximum case
temperature rating of 85C to get 68C, 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
10
20
30
40
50
60
70
80
90
100
OUTPUT LOAD (%)
-6
-4
-2
0
2
4
6
8
10
NORMALIZED OUTPUT (%)
LOAD REGULATION
4.50
4.75
5.00
5.25
5.50
Input Voltage (VDC)
-15
-10
-5
0
5
10
15
Normalized Output (%)
Line Regulation
Typical Performance: (Tc=25C)
Figure 4.
Unipolar output voltages up to 34 volts may be generated by
operating the SIP Dual Series converters in a single ended mode.
The CMN pin should not be directly used in your application.
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.
Temperature Derating
The 1 Watt Output SIP series can be operated up to a +85C
case temperature. Case temperature can be roughly calculated
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