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PDF ADDC02815DATV Data sheet ( Hoja de datos )
| Número de pieza | ADDC02815DATV | |
| Descripción | 28 V/100 W DC/DC Converters with Integral EMI Filter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
28 V dc Input, ؎12 V dc @ 8.34 A, 100 W Output
(ADDC02812DA)
28 V dc Input, ؎15 V dc @ 6.68 A, 100 W Output
(ADDC02815DA)
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
28 V/100 W DC/DC Converters
with Integral EMI Filter
ADDC02812DA/ADDC02815DA
FUNCTIONAL BLOCK DIAGRAM
–SENSE
+SENSE
ADJUST
STATUS
VAUX
INHIBIT
SYNC
ISHARE
TEMP
–VIN
+VIN
OUTPUT SIDE
CONTROL
CIRCUIT
INPUT SIDE
CONTROL
CIRCUIT
EMI FILTER
ADDC02812DA/ADDC02815DA
FIXED
FREQUENCY
DUAL
INTERLEAVED
POWER TRAIN
OUTPUT
FILTER
–VOUT
–VOUT
VCOM
VCOM
+VOUT
+VOUT
GENERAL DESCRIPTION
The ADDC02812DA and ADDC02815DA hybrid military dc/
dc converters with integral EMI filter offer the highest power
density of any dc/dc power converters with their features and in
their power range available today. The converters with integral
EMI filter are a fixed frequency, 1 MHz, square wave switching
dc/dc power supply. They are not variable frequency resonant
converters. In addition to many protection features, these con-
verters have system level features that allow them to be used as a
component in larger systems as well as a stand-alone power
supply. The units are designed for high reliability and high
performance applications where saving space and/or weight are
critical.
The ADDC02812DA and ADDC02815DA are available in a
hermetically sealed, molybdenum based hybrid package and are
easily heatsink mountable. Three screening levels are available,
including military SMD.
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
conditions: 16 V–50 V dc; survives low line, high line, and
positive and negative transients
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
REV. A
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: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1997
1 page  
Typical Performance Curves
86
28V
84
40V 18V
82
80
78 VIN = 28V
VO = +12V
76 TC = +25؇C
74
72
70
10 20 30 40 50 60 70 80 90 100
OUTPUT POWER – Watts
Figure 1. Efficiency vs. Line and Load at +25°C
(ADDC02812DA)
88
86
18V
84
28V
82
80 40V
78
76
VIN = 28V
VO = ؎ 15V
TC = +25؇C
74
72
7010 20 30 40 50 60 70 80 90 100
OUTPUT POWER – Watts
Figure 2. Efficiency vs. Line and Load at +25°C
(ADDC02815DA)
87
86
85
84
83
–55 –45 –35 –15 –5
5 25 45 65 85 90
TCASE – ؇C
Figure 3. Efficiency vs. Case Temperature (°C)
(at Nominal VIN, 75% Max Load, ADDC02812DA)
ADDC02812DA/ADDC02815DA
14.4
14.2
14.0
13.8
13.6
13.4
13.2
13.0
50
60 70 80 90
OUTPUT POWER – Watts
100
Figure 4. Low Line Dropout vs. Load at 90°C Case
Temperature
1.00
0.50
0.00
–0.50
–1.00
–55 –35 –15
5
25 55 75 90
TCASE – ؇C
Figure 5. Normalized Output Voltage vs. Case
Temperature (°C)
2V
/DIV
VO
VINHIBIT
1ms
Figure 6. Output Voltage Transient During Turn-On
with Minimum Load Displaying Soft Start When Supply
Is Enabled
REV. A
–5–
5 Page 
ADDC02812DA/ADDC02815DA
Input Voltage Transient Protection: The converters have a
transient voltage suppressor connected across their input leads
to protect the units against high voltage pulses (both positive
and negative) of short duration. With the power supply con-
nected in the typical system setup shown in Figure 17, a tran-
sient voltage pulse is created across the converter in the
following manner. A 20 µF capacitor is first charged to 400 V.
It is then connected directly across the converter’s end of the
two meter power lead cable through a 2 Ω on-state resistance
MOSFET. The duration of this connection is 10 µs. The pulse
is repeated every second for 30 minutes. This test is repeated
with the connection of the 20 µF capacitor reversed to create a
negative pulse on the supply leads. (If continuous reverse volt-
age protection is required, a diode can be added externally in
series at the expense of lower efficiency for the power system.)
The 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.
THERMAL CHARACTERISTICS
Junction and Case Temperatures: 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. The hottest
semiconductors in the 100 W product line of Analog Devices’
high density power supplies are the switching MOSFETs and
the output rectifiers. There 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. (The 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. The thermal charac-
teristics section of the specification table states the hottest junc-
tion temperature for maximum output power at a specified case
temperature. The 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 responsi-
bility 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 tem-
perature is a function of the ambient temperature and the
mechanical heat removal system. The static relationship of
these variables is established by the following formula:
where
TC = TA + (PD × RθCA)
TC = case temperature measured at the center of the package
bottom,
TA = ambient temperature of the air available for cooling,
PD = the power, in watts, dissipated in the power supply,
RθCA = the thermal resistance from the center of the package
to free air, or case to ambient.
The power dissipated in the power supply, PD, can be calculated
from the efficiency, h, given in the data sheets and the actual
output power, PO, in the user’s application by the following
formula:
PD
=
PO
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 × RθCA) or RθCA = 0.75°C/W
This 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.
SYSTEM INSTABILITY CONSIDERATIONS
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. This negative resistance could cause
system instability problems.
REV. A
–11–
11 Page | ||
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| PDF Descargar | [ Datasheet ADDC02815DATV.PDF ] | |
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