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參數(shù)資料
| 型號(hào)： | ADDC02828SA |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 28 V/100 W DC/DC Converter with Integral EMI Filter |
| 中文描述： | 中西區(qū)區(qū)議會(huì)28 V/100 /直流轉(zhuǎn)換器積分EMI濾波器 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | ADDC02828SA |
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ADDC02828SA
REV. 0
–12–
ripple voltages will be smaller than if the load is grounded. T he
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. T he 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.
CE 101:
T his test measures emissions on the input leads in the
frequency range between 30 Hz and 10 kHz. T he 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. T here are several CE101
limit curves in MIL -ST D-461D. T he 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). T he components at
60 Hz and its harmonics are a result of ripple in the output of
the power source used to supply the converter.
CE 102:
T his test measures emissions in the frequency range
between 10 kHz and 10 MHz. T he measurements are made on
both of the input leads of the converter which are connected to
the power source through LISNs. T he 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 +V
IN
line. While the measurement taken from the
input return line is slightly different, both comfortably meet the
MIL-ST D-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:
T his test measures the ability of the converter to reject
low frequency differential signals, 30 Hz to 50 kHz, injected on
the dc inputs. T he measurement is taken on the output power
leads. T he 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-ST D-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. T he curve of the injected signal should be multiplied
by the audio susceptibility curve to determine the output ripple
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. T his is covered in the specification table in the section
entitled T hermal Characteristics.
E MI CONSIDE RAT IONS
T he ADDC02828SA has an integral differential- and common-
mode EMI filter that is designed to meet all applicable require-
ments in MIL-ST D-461D when the power converter is installed
in a typical system setup (described below). T he converter also
contains transient protection circuitry that permits the unit to
survive short, high voltage transients across its input power
leads. T he purpose of this section is to describe the various
MIL-ST D-461D tests and the converter’s corresponding perfor-
mance. Consult factory for additional information.
T he 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-ST D-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. T he 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
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