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PDF ( 数据手册 , 数据表 ) ADDC02803SCTV

零件编号 ADDC02803SCTV
描述 28 V/66 W/100 W DC/DC Converters with Integral EMI Filter
制造商 Analog Devices
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ADDC02803SCTV 数据手册, 描述, 功能
a
28 V/66 W/100 W DC/DC Converters
with Integral EMI Filter
FEATURES
28 V dc Input, 5 V dc @ 20 A, 100 W Output
(ADDC02805SA)
28 V dc Input, 3.3 V dc @ 20 A, 66 W Output
(ADDC02803SC)
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
ADDC02803SC/ADDC02805SA
FUNCTIONAL BLOCK DIAGRAM
– SENSE
+ SENSE
ADJUST
STATUS
VAUX
INHIBIT
SYNC
ISHARE
TEMP
–VIN
+VIN
OUTPUT SIDE
CONTROL
CIRCUIT
INPUT SIDE
CONTROL
CIRCUIT
EMI FILTER
ADDC02803SC
ADDC02805SA
FIXED
FREQUENCY
DUAL
INTERLEAVED
POWER TRAIN
OUTPUT
FILTER
RETURN
RETURN
RETURN
+VOUT
+VOUT
+VOUT
GENERAL DESCRIPTION
The ADDC02803SC and ADDC02805SA hybrid dc/dc con-
verters with integral EMI filters offer the highest power density
of any dc/dc converter with their features and in their power
range available today. The converters with integral EMI filters
are fixed frequency, 1 MHz square wave switching dc/dc power
supplies. They are not variable frequency resonant converters.
In addition to many protection features, these converters have
system level features that allow them to be used as components
in larger systems as well as stand-alone power supplies. The
units are designed for high reliability and high performance
applications where saving space and/or weight are critical.
The ADDC02803SC and ADDC02805SA are available in
three screening grades; all grades use a hermetically sealed,
molybdenum based hybrid package. Three screening levels
are available, including military SMD.
PRODUCT HIGHLIGHTS
1. Up to 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 section entitled: Input Voltage
Range.
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. 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., 1998







ADDC02803SCTV pdf, 数据表
ADDC02803SC/ADDC02805SA
BASIC OPERATION
The ADDC02803SC and ADDC02805SA converters use a
flyback topology with dual interleaved power trains operating
180° out of phase. Each power train switches at a fixed fre-
quency of 500 kHz, resulting in a 1 MHz fixed switching fre-
quency 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 converters use current mode control and employ a high
performance opto-isolator in its feedback path to maintain
isolation 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 of 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 shutdown 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
frequency. This feature is particularly useful in eliminating
beat frequencies which 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.
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 margin.
Consult factory if long remote sense leads are to be used.
Pin 3 (ADJUST)
An adjustment pin is provided so that the user can change the
nominal output voltage during the prototype stage. Since very
low temperature coefficient resistors are used to set the output
voltage and maintain tight regulation over temperature, using
standard 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
adjusted 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 24 and 25 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 – %
Figure 24. External Resistor Value for Reducing Output
Voltage
5
4
3
2
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. Pin 1 must
always be connected to the output return and Pin 2 must always
be connected to +VOUT. These connections can be made at any
1
0
101
102 103 104
OUTPUT VOLTAGE – %
105
Figure 25. External Resistor for Increasing Output Voltage
–8– REV. A







ADDC02803SCTV equivalent, schematic
ADDC02803SC/ADDC02805SA
MECHANICAL CONSIDERATIONS
When mounting the converter into the next higher level assembly,
it is important to ensure good thermal contact is made between
the converter and the external heat sink. Poor thermal connec-
tion can result in the converter shutting off, due to the tempera-
ture shutdown feature (Pin 9), or reduced reliability for the
converter due to higher-than-anticipated junction and case
temperatures. For these reasons the mounting tab locations
were selected to ensure good thermal contact is made near the
hot spots of the converter, which are shown in the shaded areas
of Figure 34.
The pins of the converter are typically connected to the next
higher level assembly by bending them at right angles, either
down or up, and cutting them shorter for insertion in printed
circuit board through holes. In order to maintain the hermetic
integrity of the seals around the pins, a fixture should be used
for bending the pins without stressing the pin-to-sidewall seals.
It is recommended that the minimum distance between the
package edge and the inside of the pin be 100 mils (2.54 mm)
for the 40 mil (1.02 mm) diameter pins; 120 mils (3.05 mm)
from the package edge to the center of the pin as shown in
Figure 35.
0.100"
(2.54mm)
0.120"
(3.05mm)
Figure 35. Minimum Bend Radius of 40 Mil (1.02 mm)
Pins
Figure 34. Hot Spots (Shaded Areas) of DC/DC Converter
+28VDC
PS1
1
2 ADDC02805SA
OR
10 ADDC02803SC
11
17
16
15
14
13
12
RLOAD
28RTN
C1
NOTE: VALUE OF C1 IS DEPENDENT ON SOURCE IMPEDANCE.
REFER TO SECTION ON SYSTEM INSTABILITY CONSIDERATIONS.
Figure 36. Typical Power Connections and External Parts for Converter
+28VDC
28RTN
C1
PS1
1
2 ADDC02805SA
8
10
OR
ADDC02803SC
11
17
16
15
14
13
12
I SHARE
PS2
1 17
2
8
10
ADDC02805SA
OR
ADDC02803SC
16
15
14
13
11 12
VOUT+
+SENSE PS1
+SENSE PS2
–SENSE PS1
–SENSE PS2
RLOAD
VOUT
NOTE: VALUE OF C1 IS DEPENDENT ON SOURCE IMPEDANCE.
REFER TO SECTION ON SYSTEM INSTABILITY CONSIDERATIONS.
Figure 37. Typical Connections for Paralleling Two Converters
–16–
REV. A










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