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參數(shù)資料
| 型號： | ADDC02828SATV |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 28 V/100 W DC/DC Converter with Integral EMI Filter |
| 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)： | 10/16頁 |
| 文件大?。?/td> | 204K |
| 代理商： | ADDC02828SATV |
ADDC02828SA
REV. 0
–10–
T he duration of this connection is 10
μ
s. T he pulse is repeated
every second for 30 minutes. T his test is repeated with the
connection of the 20
μ
F capacitor reversed to create a negative
pulse on the supply leads. (If continuous reverse voltage protec-
tion is required, a diode can be added externally in series at the
expense of lower efficiency for the power system.)
T he converter responds to this input transient voltage test by
shutting down due to its input overvoltage protection feature.
Once the pulse is over, the converter initiates a soft-start, which
is completed before the next pulse. No degradation of converter
performance occurs.
T HE RMAL CHARACT E RIST ICS
Junction and Case T emperatures:
It is important for the
user to know how hot the hottest semiconductor junctions
within the converter get and to understand the relationship
between junction, case and ambient temperatures. T he hottest
semiconductors in the 100 W product line of Analog Devices’
high density power supplies are the switching MOSFET s and
the output rectifiers. T here is an area inside the main power
transformers that is hotter than these semiconductors, but it is
within NAVMAT guidelines and well below the Curie tempera-
ture of the ferrite. (T he Curie temperature is the point at which
the ferrite begins to lose its magnetic properties.)
Since NAVMAT guidelines require that the maximum junction
temperature be 110
°
C, the power supply manufacturer must
specify the temperature rise above the case for the hottest semi-
conductors so the user can determine what case temperature
is required to meet NAVMAT guidelines. T he thermal charac-
teristics section of the specification table states the hottest junction
temperature for maximum output power at a specified case
temperature. T he unit can operate to higher case temperatures
than 90
°
C, but 90
°
C is the maximum temperature that permits
NAVMAT guidelines to be met.
Case and Ambient Temperatures:
It is the user’s responsibility
to properly heat sink the power supply in order to maintain the
appropriate case temperature and, in turn, the maximum junction
temperature. Maintaining the appropriate case temperature is a
function of the ambient temperature and the mechanical heat
removal system. T he static relationship of these variables is
established by the following formula:
T
C
=
T
A
+
(
P
D
×
R
θ
CA
)
where
T
C
= case temperature measured at the center of the pack-
age bottom,
= ambient temperature of the air available for cooling,
= the power, in watts, dissipated in the power supply,
R
θ
CA
= the thermal resistance from the center of the package
to free air, or case to ambient.
T he power dissipated in the power supply,
P
D
, can be calcu-
lated from the efficiency,
h
, given in the data sheets and the
actual output power,
P
O
, in the user’s application by the follow-
ing formula:
T
A
P
D
P
D
=
P
O
1
η
±1
For example, at 80 W of output power and 80% efficiency, the
power dissipated in the power supply is 20 W. If, under these
conditions, the user wants to maintain NAVMAT deratings
(i.e., a case temperature of approximately 90
°
C) with an ambi-
ent temperature of 75
°
C, the required thermal resistance, case
to ambient, can be calculated as
90 = 75 + (20
×
R
θ
CA
) or
R
θ
CA
= 0.75
°
C
/
W
T his thermal resistance, case to ambient, will determine what
kind of heat sink and whether convection cooling or forced air
cooling is required to meet the constraints of the system.
SY ST E M INST ABILIT Y CONSIDE RAT IONS
In a distributed power supply architecture, a power source
provides power to many “point-of-load” (POL) converters. At
low frequencies, the POL converters appear incrementally as
negative
resistance loads. T his negative resistance could cause
system instability problems.
Incremental Negative Resistance:
A POL converter is de-
signed to hold its output voltage constant no matter how its
input voltage varies. Given a constant load current, the power
drawn from the input bus is therefore also a constant. If the
input voltage increases by some factor, the input current must
decrease by the same factor to keep the power level constant.
In incremental terms, a positive incremental change in the
input voltage results in a negative incremental change in the
input current. T he POL converter therefore looks, incremen-
tally, as a negative resistor.
T he value of this negative resistor at a particular operating
point,
V
IN
,
I
IN
, is:
R
N
=
±
V
IN
I
IN
Note that this resistance is a function of the operating point. At
full load and low input line, the resistance is its smallest, while
at light load and high input line, it is its largest.
Potential System Instability:
T he preceding analysis assumes
dc voltages and currents. For ac waveforms the incremental
input model for the POL converter must also include the effects
of its input filter and control loop dynamics. When the POL
converter is connected to a power source, modeled as a voltage
source,
V
S,
in series with an inductor,
L
S
,
and some positive
resistor,
R
S
, the network of Figure 23 results.
L
P
C
P
–|R
N
|
ADI DC/DC CONVERTER
L
S
R
S
V
S
INPUT
TERMINALS
Figure 23. Model of Power Source and POL Converter
Connection
T he network shown in Figure 23 is second order and has the
following characteristic equation:
s
2
(
L
S
+
L
P
)
C
+
s
(
L
S
+
L
P
)
±|
R
N
|
+
R
S
C
P
+
1
=
0
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