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PDF ADDC02808PBKV Data sheet ( Hoja de datos )
| Número de pieza | ADDC02808PBKV | |
| Descripción | 28 V/ 200 W Pulsed DC/DC Converter with Integral EMI Filter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
28 V, 200 W Pulsed DC/DC Converter
with Integral EMI Filter
FEATURES
28 V dc Input, 8 V dc @ 25 A, 200 W Pulse Output
Integral EMI Filter
Ultrafast Transient Response
Minimal Output Voltage Deviation
Low Weight: 80 Grams
NAVMAT Derated
Many Protection and System Features
APPLICATIONS
Distributed Power Architecture for Driving T/R Modules
Motor and Actuator Drivers
ADDC02808PB
FUNCTIONAL BLOCK DIAGRAM
–SENSE
+SENSE
ADJUST
STATUS
OUTPUT SIDE
CONTROL
CIRCUIT
VAUX
INHIBIT
SYNC
ISHARE
TEMP
–VIN
+VIN
INPUT SIDE
CONTROL
CIRCUIT
EMI FILTER
ADDC02808PB
FIXED
FREQUENCY
DUAL
INTERLEAVED
POWER TRAIN
OUTPUT
FILTER
RETURN
RETURN
RETURN
+VOUT
+VOUT
+VOUT
GENERAL DESCRIPTION
The ADDC02808PB hybrid military dc/dc converter is com-
pensated specifically for pulse applications where fast transient
response and minimum output voltage deviation are required.
It is also designed to deliver very high, pulsed output power.
The unit is designed for high reliability and high performance
applications where saving space and/or weight are critical.
The ADDC02808PB has been characterized over a wide variety
of load conditions. Its transient response has been set to insure
output stability over a broad range of load capacitance. For
applications that require factory modified compensation
optimized for a specific load, or for applications that require a
different output voltage than 8 V dc, contact the factory.
The ADDC02808PB is available in a hermetically sealed,
molybdenum based hybrid package and is easily heatsink
mountable. Three screening levels are available, including
military SMD.
PRODUCT HIGHLIGHTS
1. 120 W/cubic inch pulsed power density with an integral EMI
filter
2. Ultrafast transient response time with minimum output
voltage deviation
3. Light weight: 85 grams
4. Operational and survivable over a wide range of input condi-
tions: 16 V–50 V dc; survives low line, high line
5. High reliability; NAVMAT derated
6. Protection features include:
Output Overvoltage Protection
Output Short Circuit Current Protection
Thermal Monitor/Shutdown
Input Overvoltage Shutdown
Input Transient Protection
7. System level features include:
Current Sharing for Parallel Operation
Logic Level Disable
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
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–100
10
100 1k 10k
FREQUENCY – Hz
50k
Figure 7. Audio Susceptibility (Magnitude of VOUT/VIN)
1k
100
10
1
0.1
10
100 1k 10k
FREQUENCY – Hz
100k
Figure 8. Incremental Input Impedance (Magnitude)
ADDC02808PB
1
0.1
0.01
0.001
10
100 1k 10k
FREQUENCY – Hz
100k
Figure 9. Incremental Output Impedance (Magnitude)
5mV
1mV
0.5mV
100V
50V
0
10
FREQUENCY – MHz
20
Figure 10. Output Frequency Spectrum
REV. A
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5 Page 
Even when the load current steps down to 0.1 A, the maximum
deviation of the output voltage is only about 400 mV, or 5%.
However, it is important to realize that if the next power pulse
occurs before this transient is over, then the output voltage will
not have the response depicted in the last section. This is be-
cause the feedback integrator will not have had time to return
to its normal state, and so the converter’s ability to respond to a
positive step change in load current will be reduced. The maxi-
mum negative going deviation in the output voltage under this
circumstance will then be greater than is shown in the figures of
that section.
Should this situation arise, one approach would be to step the
load current down to an intermediate value (e.g., 4 A) at the
end of the power pulse, and then let this current decay to a
smaller value (e.g., 0.1 A) with a time constant in the 100 µs to
200 µs range. This should permit a rapid return to a steady state
condition at the end of the power pulse without requiring a large
average load current during the low power portion of the cycle.
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 cata-
strophic 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 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 AD-
JUST (Pin 3) to –SENSE (Pin 1). To make the output voltage
lower, place a resistor from ADJUST (Pin 3) to +SENSE (Pin
2). Figures 30 and 31 show resistor values for a ± 5% change in
output voltage.
With regard to the range that the output voltage can be adjusted
by the user, there are two concerns. As the output voltage is
raised it may become difficult to maintain regulation at full
power and low input voltage. As the output voltage is lowered,
it may become difficult to maintain regulation at minimum
power and high input line.
ADDC02808PB
8
7
6
5
4
3
2
1
99 98 97 96
OUTPUT VOLTAGE – %
95
Figure 30. External Resistor Value for Reducing Output
Voltage
5
4
3
2
1
0
101
102 103 104
OUTPUT VOLTAGE – %
105
Figure 31. External Resistor for Increasing Output Voltage
Pin 4 (STATUS)
Pin 4 is active high referenced to –SENSE (Pin 1), indicating
that the output voltage is typically within ± 5%. The pin is both
pulled up and down by internal circuitry. Figures 32 and 33
show the typical source and sink capabilities of the status out-
put. Refer to the paragraphs describing Pin 3 (ADJUST) for
effect on status trip point.
5
4
3
2
1
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IOH – mA
Figure 32. Source Capability of Status Output
REV. A
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