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ADDC02828SATV Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADDC02828SATV
Beschreibung 28 V/100 W DC/DC Converter with Integral EMI Filter
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADDC02828SATV Datasheet, Funktion
a
FEATURES
28 V dc Input, 28 V dc @ 3.6 A, 100 W Output
Integral EMI Filter Designed to Meet MIL-STD-461D
Low Weight: 80 Grams
NAVMAT Derated
Many Protection and System Features
APPLICATIONS
Commercial and Military Airborne Electronics
Missile Electronics
Space-Based Antennae and Vehicles
Mobile/Portable Ground Equipment
Distributed Power Architecture for Active Array Radar
28 V/100 W DC/DC Converter
with Integral EMI Filter
ADDC02828SA
FUNCTIONAL BLOCK DIAGRAM
– SENSE
+ SENSE
ADJUST
STATUS
VAUX
INHIBIT
SYNC
ISHARE
TEMP
–VIN
+VIN
OUTPUT SIDE
CONTROL
CIRCUIT
INPUT SIDE
CONTROL
CIRCUIT
EMI FILTER
FIXED
FREQUENCY
DUAL
INTERLEAVED
POWER TRAIN
OUTPUT
FILTER
RETURN
RETURN
SENSEREF
SENSEREF
+VOUT
+VOUT
ADDC02828SA
GENERAL DESCRIPTION
The ADDC02828SA hybrid dc/dc converter with integral EMI
filter offers the highest power density of any dc/dc converter
available today with its features and in its power range. The
converter with integral EMI filter is a fixed frequency, 1 MHz,
square wave switching dc/dc power supply. It is not a variable
frequency resonant converter. In addition to many protection
features, this converter has system level features that allow it to
be used as a component in larger systems as well as a stand-
alone power supply. The unit is designed for high reliability and
high performance applications where saving space and/or weight
is critical.
The ADDC02828SA is available in three screening grades; all
grades use a hermetically sealed, molybdenum based hybrid
package. Contact factory for MIL-STD-883 device availability.
PRODUCT HIGHLIGHTS
1. 60 W/cubic inch power density with an integral EMI filter
designed to meet all applicable requirements in MIL-STD-
461D when installed in a typical system setup.
2. Light weight: 80 grams
3. Operational and survivable over a wide range of input condi-
tions: 16 V–50 V dc; survives low line, high line and positive
and negative transients. See Input Voltage Range section.
4. High reliability; NAVMAT derated
5. Protection Features Include:
Output Overvoltage Protection
Output Short Circuit Current Protection
Thermal Monitor/Shutdown
Input Overvoltage Shutdown
Input Transient Protection
6. System Level Features Include:
Current Sharing for Parallel Operation
Inhibit Control
Output Status Signal
Synchronization for Multiple Units
Input Referenced Auxiliary Voltage Supply
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997






ADDC02828SATV Datasheet, Funktion
ADDC02828SA–Typical EMI Curves and Test Setup
130
CONDUCTED EMISSIONS CE–101
166
110 146
RE101 MIL–STD–461D
90 126
RE101–1
CE101–1 4.5 AMPS
70 106
50 86
30
0.0001
0.001
FREQUENCY – MHz
0.01
Figure 11. Conducted Emissions, MIL-STD-461D, CE101,
+28 V Hot Line 100 W Load
66
0.0001
0.001
0.01
FREQUENCY – MHz
0.1
Figure 13. Radiated Emissions, MIL-STD-461D, RE101,
100 W Load
130
CONDUCTED EMISSIONS CE–102
110
90
RADIATED EMISSIONS RE–102
70
90 50
70
LIMIT 28VDC
50
30 RE102–2
10
30
0.01
0.1 1
FREQUENCY – MHz
10
Figure 12. Conducted Emissions, MIL-STD-461D, CE102,
+28 V Hot Line 100 W Load
–30
0.01
0.1 1 10 100
FREQUENCY – MHz
1000
Figure 14. Radiated Emissions, MIL-STD-461D, RE102,
Vertical Polarity, 100 W Load
LISN
LISN
TWO METERS OF
TWISTED CABLE
1
100µF
2µF
82nF
+VIN
+VOUT
82nF
–VIN
RETURN
CASE
0.1µF
1/4
GROUND PLANE
NOTE: 100µF CAPACITOR AND 1RESISTOR PROVIDE STABILIZATION FOR 100µH DIFFERENTIAL SOURCE INDUCTANCE
INTRODUCED BY THE LISNs. REFER TO SECTION ON EMI CONSIDERATIONS FOR MORE INFORMATION.
Figure 15. Schematic of Test Setup for EMI Measurements
Note: Figures 11–15 were obtained from measurements on the ADDC02805SA, a single 5 V dc output converter. Since the con-
struction and topology of the ADDC02828SA is almost identical to the ADDC02805SA, and the component values of the EMI
differential and common-mode filter in the ADDC02828SA are identical to the ADDC02805SA, the subject figures are shown here
as typical of the ADDC02828SA.
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ADDC02828SATV pdf, datenblatt
ADDC02828SA
of 70% of its maximum current, but its junction temperature
can be higher than 110°C if the case temperature of the con-
verter, which is not controlled by the manufacturer, is allowed
to go higher. Since some users may choose to operate the power
supply at a case temperature higher than 90°C, it then becomes
important to know the temperature rise of the hottest semicon-
ductors. This is covered in the specification table in the section
entitled Thermal Characteristics.
EMI CONSIDERATIONS
The ADDC02828SA has an integral differential- and common-
mode EMI filter that is designed to meet all applicable require-
ments in MIL-STD-461D when the power converter is installed
in a typical system setup (described below). The converter also
contains transient protection circuitry that permits the unit to
survive short, high voltage transients across its input power
leads. The purpose of this section is to describe the various
MIL-STD-461D tests and the converter’s corresponding perfor-
mance. Consult factory for additional information.
The figures and tests referenced herein were obtained from
measurements on the ADDC02805SA, a single 5 V dc output
converter. Since the construction and topology of the 28 V dc
output converter is almost identical to the 5 V dc output converter,
and the component values of the EMI differential- and common-
mode filter in the 28 V dc output converter are identical to the
5 V output converter, the text references these figures and tests
as typical of the ADDC02828SA converter as well.
Electromagnetic interference (EMI) is governed by MIL-STD-461D,
which establishes design requirements, and MIL-STD-462D,
which defines test methods. EMI requirements are categorized
as follows (xxx designates a three digit number):
CExxx: Conducted Emissions (EMI produced internal to the
power supply, which is conducted externally through its input
power leads)
CSxxx: Conducted Susceptibility (EMI produced external to
the power supply, which is conducted internally through the
input power leads and may interfere with the supply’s op-
eration)
RExxx: Radiated Emissions (EMI produced internal to the
power supply, which is radiated into the surrounding space)
RSxxx: Radiated Susceptibility (EMI produced external to
the power supply, which radiates into or through the power
supply and may interfere with its proper operation)
It should be noted that there are several areas of ambiguity, with
respect to CE102 measurements, that may concern the systems
engineer. One is the nature of the load. If it is constant, the
ripple voltage on the converter’s input leads is due only to the
operation of the converter. If, on the other hand, the load is
changing over time, this variation causes an additional input
current and voltage ripple to be drawn at the same frequency. If
the frequency is high enough, the converter’s filter will help
attenuate this second source of ripple, but if it is below approxi-
mately 100 kHz, it will not. The system may then not meet the
CE102 requirement, even though the converter is not the source
of the EMI. If this is the case, additional capacitance may be
needed across the load or across the input to the converter.
Another ambiguity in the CE102 measurement concerns common-
mode voltage. If the load is left unconnected from the ground
plane (even though the case is grounded), the common-mode
ripple voltages will be smaller than if the load is grounded. The
test specifications do not state which procedure should be used.
However, in neither case (load grounded or floating) will the
typical EMI test setup described below be exactly representative
of the final system configuration EMI test. For the following
reasons, the same is true if separately packaged EMI filters are
used.
In almost all systems the output ground of the converter is ulti-
mately connected to the input ground of the system. The para-
sitic capacitances and inductances in this connection will affect
the common-mode voltage and the CE102 measurement. In
addition, the inductive impedance of this ground connection
can cause resonances, thereby affecting the performance of the
common-mode filter in the power supply.
In response to these ambiguities, the Analog Devices’ converter
has been tested for CE102 under a constant load and with the
output ground floating. While these measurements are a good
indication of how the converter will operate in the final system
configuration, the user should confirm CE102 testing in the
final system configuration.
CE101: This test measures emissions on the input leads in the
frequency range between 30 Hz and 10 kHz. The intent of this
requirement is to ensure that the dc/dc converter does not cor-
rupt the power quality (allowable voltage distortion) on the
power buses present on the platform. There are several CE101
limit curves in MIL-STD-461D. The most stringent one app-
licable for the converter is that for submarine applications.
Figure 11 shows that the converter easily meets this requirement
(the return line measurement is similar). The components at
60 Hz and its harmonics are a result of ripple in the output of
the power source used to supply the converter.
CE102: This test measures emissions in the frequency range
between 10 kHz and 10 MHz. The measurements are made on
both of the input leads of the converter which are connected to
the power source through LISNs. The intent of this requirement
in the lower frequency portion of the requirement is to ensure
that the dc/dc converter does not corrupt the power quality
(allowable voltage distortion) on the power buses present on the
platform. At higher frequencies, the intent is to serve as a sepa-
rate control from RE102 on potential radiation from power
leads, which may couple into sensitive electronic equipment.
Figure 12 shows the CE102 limit and the measurement taken
from the +VIN line. While the measurement taken from the
input return line is slightly different, both comfortably meet the
MIL-STD-461D, CE102 limit. (Reference the last section of
EMI Considerations for how to adjust the external components
in the test setup circuit to increase the margin between the
specification limit and the measured results.)
CS101: This test measures the ability of the converter to reject
low frequency differential signals, 30 Hz to 50 kHz, injected on
the dc inputs. The measurement is taken on the output power
leads. The intent is to ensure that equipment performance is
not degraded from ripple voltages associated with allowable
distortion of power source voltage waveforms. Figure 7 shows a
typical audio susceptibility graph. Note that according to the
MIL-STD-461D test requirements, the injected signal between
30 Hz and 5 kHz has an amplitude of 2 V rms and from 5 kHz
to 50 kHz the amplitude decreases inversely with frequency to
0.2 V rms. The curve of the injected signal should be multiplied
by the audio susceptibility curve to determine the output ripple
–12–
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