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參數(shù)資料
| 型號： | ADDC02828SAKV |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | JT 7C 7#20 PIN GRND PLUG |
| 中文描述： | 2-OUTPUT 100 W DC-DC UNREG PWR SUPPLY MODULE |
| 封裝： | HERMETIC SEALED, HYBRID PACKAGE-17 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 204K |
| 代理商： | ADDC02828SAKV |
ADDC02828SA
REV. 0
–13–
at any frequency. When this is done, the worst case output
ripple at the frequency of the input ripple occurs at 5 kHz, at
which point there is typically a 25 mV peak-to-peak output
ripple.
It should be noted that MIL-ST D-704 has a more relaxed require-
ment for rejection of low frequency differential signals injected on
the dc inputs than MIL-ST D-461D. MIL-ST D-704 calls for a
lower amplitude ripple to be injected on the input in a narrower
frequency band, 10 Hz to 20 kHz.
CS114:
T his test measures the ability of the converter to oper-
ate correctly during and after being subjected to currents in-
jected into bulk cables in the 10 kHz to 400 MHz range. Its
purpose is to simulate currents that would be developed in these
cables due to electromagnetic fields generated by antenna trans-
missions. T he converter is designed to meet the requirements
of this test when the current is injected on the input power leads
cable. Consult factory for more information.
CS115:
T his test measures the ability of the converter to oper-
ate correctly during and after being subjected to 30 ns long
pulses of current injected into bulk cables. Its purpose is to
simulate transients caused by lightning or electromagnetic
pulses. T he converter is designed to meet this requirement
when applied to its input power leads cable. Consult factory for
more information.
CS116:
T his test measures the ability of the converter to oper-
ate correctly during and after being subjected to damped sinu-
soid transients in the 10 kHz to 100 MHz range. Its purpose is
to simulate current and voltage waveforms that would occur
when natural resonances in the system are excited. T he con-
verter is designed to meet this requirement when applied to its
input power leads cable. Consult factory for more information.
RE 101:
T his requirement limits the strength of the magnetic
field created by the converter in order to avoid interference with
sensitive equipment located nearby. T he measurement is made
from 30 Hz to 100 kHz. T he most stringent requirement is for
the Navy. Figure 13 shows the test results when the pickup coil
is held 7 cm above the converter. As can be seen, the converter
easily meets this requirement.
RE 102:
T his requirements limits the strength of the electric
field emissions from the power converter to protect sensitive
receivers from interference. T he measurement is made from
10 kHz to 18 GHz with the antenna oriented in the vertical
plane. For the 30 MHz and above range, the standard calls for
the measurement to be made with the antenna oriented in the
horizontal plane as well.
In a typical power converter system setup, the radiated emis-
sions can come from two sources: 1) the input power leads as
they extend over the two meter distance between the LISNs and
the converter, as required for this test, and 2) the converter
output leads and load. T he latter is likely to create significant
emissions if left uncovered since minimal EMI filtering is
provided at the converter’s output. It is typical, however,
that the power supply and its load would be contained in a
conductive enclosure in applications where this test is applicable.
A metal screen enclosure was therefore used to cover the con-
verter and its load for this test.
Figure 14 shows test results for the vertical measurement and
compares them against the most stringent RE102 requirement;
the horizontal measurement (30 MHz and above) was similar.
As can be seen, the emissions just meet the standard in the
18 MHz–28 MHz range. T his component of the emissions is
due to common-mode currents flowing through the input power
leads. As mentioned in the section on CE102 above, the level
of common-mode current that flows is dependent on how the
load is connected. T his measurement is therefore a good indi-
cation of how well the converter will perform in the final con-
figuration, but the user should confirm RE102 testing in the
final system. (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.)
RS101:
T his requirement is specialized and is intended to check
for sensitivity to low frequency magnetic fields in the 30 Hz to
50 kHz range. T he converter is designed to meet this require-
ment. Consult factory for more information.
RS103:
T his test calls for correct operation during and after the
unit under test is subjected to radiated electric fields in the 10 kHz
to 40 GHz range. T he intent is to simulate electromagnetic
fields generated by antenna transmissions. T he converter is
designed to meet this requirement. Consult factory for more
information.
Circuit Setup for E MI T est
Figure 15 shows a schematic of the test setup used for the EMI
measurements discussed above. T he output of the converter is
connected to a resistive load designed to draw full power. T here
is a 0.1
μ
F capacitor placed across this resistor that typifies by-
pass capacitance normally used in this application. At the input
of the converter there are two differential capacitors (the larger
one having a series resistance) and two small common-mode
capacitors connected to case ground. T he case itself was con-
nected to the metal ground plane in the test chamber. For the
RE102 test, a metal screen box was used to cover both the con-
verter and its load (but not the two meters of input power lead
cables). T his box was also electrically connected to the metal
ground plane.
With regard to the components added to the input power lines,
the 100
μ
F capacitor with its 1
series resistance is required to
achieve system stability when the unit is powered through the
L ISNs, as the MIL -ST D-461D standard requires. T hese
LISNs have a series inductance of 50
μ
H at low frequencies,
giving a total differential inductance of 100
μ
H. As explained
earlier in the System Instability section, such a large series
source inductance will cause an instability as it interacts with the
converter’s negative incremental input resistance unless some
corrective action is taken. T he 100
μ
F capacitor and 1
resis-
tor provide the stabilization required.
It should be noted that the values of these stabilization components
are appropriate for a single converter load. If the system makes
use of several converters, the values of the components will need
to be changed slightly, but not such that they are repeated for
every converter. It should also be noted that most system appli-
cations will not have a source inductance as large as the 100
μ
H
built into the LISNs. For those systems, a much smaller input
capacitor could be used.
Increasing Margin Between Specification Limit and Measured
Results
With regard to the 2
μ
F differential-mode capacitor and the two
82 nF common-mode capacitors, these components were in-
cluded in the test setup to augment the performance of the
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