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ADDC02828SAKV 데이터시트 PDF




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부품번호 ADDC02828SAKV 기능
기능 28 V/100 W DC/DC Converter with Integral EMI Filter
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ADDC02828SAKV 데이터시트, 핀배열, 회로
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




ADDC02828SAKV pdf, 반도체, 판매, 대치품
ADDC02828SA–Typical Performance Curves
88
86 VO = 28V
T = +25؇C
84
18V
82
40V
80
78 28V
76
74
72
70
68
10 20 30 40 50 60 70
OUTPUT POWER – Volts
80
90 100
1.00
0.50
28VIN
75WATTS
0.00
–0.50
–1.00
–55 –45 –35 –25 –15 –5
5 15 25 35 45 55 65 75 85
TCASE °C
Figure 1. Efficiency vs. Line and Load at +25°C
Figure 4. Output Voltage vs. Case Temperature (°C)
87
28VIN
75W PEAK
86
85
84
83
82
–55 –45 –35 –25 –15 –5
5 15 25 35 45 55 65 75 85
TCASE °C
Figure 2. Efficiency vs. Case Temperature (°C)
(at Nominal VIN, 75% Max Load)
VOUT
10V
VINHIBIT
10V 5ms
Figure 5. Output Voltage Transient During Turn-On with
Minimum Load Displaying Soft Start When Supply Is
Enabled
14.0
13.9
13.8
13.7
13.6
13.5
13.4
13.3
13.2
13.1
13.0
75
80 85 90
95
OUTPUT POWER – Watts
100
Figure 3. Low Line Dropout vs. Load at 90°C Case
Temperature
500mV/Div
50µs
Figure 6. Output Voltage Transient Response to
a 1.8 A to 3.6 A Step Change in Load with Zero Load
Capacitance
–4– REV. 0

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ADDC02828SAKV 전자부품, 판매, 대치품
ADDC02828SA
BASIC OPERATION
The ADDC02828SA converter uses a flyback topology with
dual interleaved power trains operating 180° out of phase. Each
power train switches at a fixed frequency of 500 kHz, resulting
in a 1 MHz fixed switching frequency as seen at the input and
output of the converter. In a flyback topology, energy is stored
in the inductor during one half portion of the switching cycle
and is then transferred to the output filter during the next half
portion. With two interleaved power trains, energy is transferred
to the output filter during both halves of the switching cycle,
resulting in smaller filters to meet the required ripple.
A five pole differential input EMI filter, along with a common-
mode EMI capacitor and careful attention to layout parasitics, is
designed to meet all applicable requirements in MIL-STD-461D
when installed in a typical system setup. A more detailed dis-
cussion of CE102 and other EMI issues is included in the sec-
tion entitled EMI Considerations.
The converter uses current mode control and employs a high
performance opto-isolator in its feedback path to maintain isola-
tion between input and output. The control circuit is designed
to give a nearly constant output current as the output voltage
drops from VO nom to VSC during a short circuit condition. It
does not let the current fold back below the maximum rated
output current. The output overvoltage protection circuitry,
which is independent from the normal feedback loop, protects
the load against a break in the remote sense leads. Remote
sense connections, which can be made at the load, can adjust
for voltage drops of as much as 0.25 V dc between the converter
and the load, thereby maintaining an accurate voltage level at
the load.
An input overvoltage protection feature shuts down the con-
verter when the input voltage exceeds (nominally) 52.5 V dc.
An internal temperature sensor shuts down the unit and pre-
vents it from becoming too hot if the heat removal system fails.
The temperature sensed is the case temperature and is factory
set to trip at a nominal case temperature of 110°C to 115°C.
The shut-down temperature setting can be raised externally or
disabled by the user.
Each unit has an INHIBIT pin that can be used to turn off the
converter. This feature can be used to sequence the turn-on of
multiple converters and to reduce input power draw during
extended time in a no load condition.
A SYNC pin, referenced to the input return line (Pin 10), is
available to synchronize multiple units to one switching fre-
quency. This feature is particularly useful in eliminating beat
frequencies that may cause increased output ripple on paralleled
units. A current share pin (ISHARE) is available that permits
paralleled units to share current, typically within 5% at full load.
A low level dc auxiliary voltage supply referenced to the input
return line is provided for miscellaneous system use.
PIN CONNECTIONS
Pins 1 and 2 (؎SENSE)
Pins 1 and 2 must always be connected for proper operation,
although failure to make these connections will not be catastrophic
to the converter under normal operating conditions. If no load
is present on the converter, failure to make these connections
could result in damage to the device. If the ADDC02828SA is
used to provide a +28 V dc output, Pin 1 must always be con-
nected to the output sense reference (Pins 14 and 15) and Pin 2
must always be connected to +VOUT (Pins 12 and 13). If the
ADDC02828SA is used to provide a –28 V dc output, Pin 1
must always be connected to RETURN (Pins 16 and 17) and
Pin 2 must always be connected to the output sense reference
(Pins 14 and 15). The connections to +VOUT (for a +28 V dc
output) and RETURN (for a –28 V dc output) can be made at
any one of the output pins of the converter, or remotely at the
load. A remote connection at the load can adjust for voltage
drops of as much as 0.25 V dc between the converter and the
load.
Long remote sense leads can affect converter stability, although
this condition is rare. The impedance of the long power leads
between the converter and the remote sense point could affect
the converter’s unity gain crossover frequency and phase mar-
gin. Consult factory if long remote sense leads are to be used.
Pin 3 (ADJUST)
An adjustment pin is provided so the user can change the nomi-
nal output voltage during the prototype stage. Since very low
temperature coefficient resistors are used to set the output volt-
age and maintain tight regulation over temperature, using stan-
dard external resistors to adjust the output voltage will loosen
output regulation over temperature. Furthermore, since the
status trip point is not changed when the output voltage is ad-
justed using external resistors, the status line will no longer trip
at the standard levels of the newly adjusted output voltage. If
necessary, modified standard units can be ordered with the
necessary changes made inside the package at the factory. The
ADJUST function is sensitive to noise, and care should be taken
in the routing of connections.
To make the output voltage higher, place a resistor from ADJUST
(Pin 3) to –SENSE (Pin 1). To make the output voltage lower,
place a resistor from ADJUST (Pin 3) to +SENSE (Pin 2).
Figures 16 and 17 show resistor values for a ± 5% change in
output voltage:
8
7
6
5
4
3
2
1
99 98 97 96 95
OUTPUT VOLTAGE – %
REV. 0
Figure 16. External Resistor Value for Reducing Output
Voltage
–7–

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부품번호상세설명 및 기능제조사
ADDC02828SAKV

28 V/100 W DC/DC Converter with Integral EMI Filter

Analog Devices
Analog Devices

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