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ADDC02808PBTV Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADDC02808PBTV
Beschreibung 28 V/ 200 W Pulsed DC/DC Converter with Integral EMI Filter
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
ADDC02808PBTV Datasheet, Funktion
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






ADDC02808PBTV Datasheet, Funktion
ADDC02808PB–Typical EMI Curves & Test Setup for 28 VIN, 5 V dc Out, 100 W Converter
130
CONDUCTED EMISSIONS CE101
166
RE101 MIL-STD-461D
110 146
90 126
RE101–1
CE101–1 4.5 AMPS
70 106
50 86
30
0.0001
0.001
FREQUENCY – MHz
0.01
Figure 11. Conducted Emissions, MIL-STD-461D, CE101,
+28 V Hot Line 100 W Load
66
0.0001
0.001
0.01
FREQUENCY – MHz
0.1
Figure 13. Radiated Emissions, MIL-STD-461D, RE101,
100 W Load
130
CONDUCTED EMISSIONS CE102
110
90
70
LIMIT 28VDC
50
30
0.01
0.1 1
FREQUENCY – MHz
10
Figure 12. Conducted Emissions, MIL-STD-461D, CE102,
+28 V Hot Line 100 W Load
90
RADIATED EMISSIONS RE102
70
50
30 RE102–2
10
–30
0.01
0.1
1
10 100 1000
FREQUENCY – MHz
Figure 14. Radiated Emissions, MIL-STD-461D, RE102,
Vertical Polarity, 100 W Load
LISN
LISN
TWO METERS OF
TWISTED CABLE
1
100F
2F
82nF
+VIN
+VOUT
82nF
–VIN
RETURN
CASE
0.1F
1/4
GROUND PLANE
NOTE: 100F CAPACITOR AND 1RESISTOR PROVIDE STABILIZATION FOR 100H DIFFERENTIAL SOURCE INDUCTANCE
INTRODUCED BY THE LISNs. REFER TO SECTION ON EMI CONSIDERATIONS FOR MORE INFORMATION.
Figure 15. Schematic of Test Setup for EMI Measurements
–6– REV. A

6 Page









ADDC02808PBTV pdf, datenblatt
ADDC02808PB
1.0
0.8
0.6
0.4
0.2
0.0
1.0 4.0 7.0 10.0 13.0 16.0 19.0
IOL – mA
Figure 33. Sink Capability of Status Output
Pin 5 (VAUX)
Pin 5 is referenced to the input return and provides a semi-
regulated 14 V to 16 V dc voltage supply for miscellaneous
system use. The maximum permissible current draw is 5 mA
and the voltage varies with the output load of the converter
shown in Figure 34.
16
15
14
13
12
11
10
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0
CONVERTER OUTPUT CURRENT – A
Figure 34.
Pin 6 (INHIBIT)
Pin 6 is active low and is referenced to the input return of the
converter. Connecting it to the input return will turn the
converter off. For normal operation, the inhibit pin is inter-
nally pulled up to 12 V. Use of an open collector circuit is
recommended.
1.2
1.1
1.0
0.9
0.8
0.7
0.5
1.0 1.5
VIL – V
2.0
Figure 35. Input Characteristics of Pin 6 When Pulled Low
When Pin 6 is disconnected from input return, the converter
will restart in the soft-start mode. Pin 6 must be kept low for at
least 2 milli- seconds to initiate a full soft start. Shorter off times
will result in a partial soft start. Figure 35 shows the input char-
acteristics of Pin 6.
Pin 7 (SYNC)
Pin 7 can be used for connecting multiple converters to a master
clock. This master clock can be either an externally user-sup-
plied clock or it can be a converter that has been modified and
designated as a master unit. Consult factory for availability of
these devices. Capacitive coupling of the clock signal will insure
that if the master clock stops working the individual units will
continue to operate at their own internal clock frequency,
thereby eliminating a potential single point failure. Capacitive
coupling will also permit a wider duty cycle to be used. Consult
factory for more information. The SYNC pin has an internal
pull-down so it is not necessary to sink any current when driving
the pin low.
For user-supplied master clocks with no external circuitry, the
following specifications must be met:
a. Frequency: 1.00 MHz min
b. Duty cycle: 7% min, 14% max
c. High state voltage high level: 4 V min to 7 V max
d. Low state voltage low level: 0 V min to 3.0 V max
Users should note that the SYNC pin is referenced to the input
return of the converter. If the user-supplied master clock is
generated on the output side of the converter, the signal should
be isolated.
Users should be careful about the frequency selected for the
external master clock. Higher switching frequencies will reduce
efficiency and may reduce the amount of output power available
at minimum input line. Consult factory for modified standard
switching frequency to accommodate system clock characteristics.
Pin 8 (ISHARE)
Pin 8 allows paralleled converters to share the total load cur-
rent, typically within ± 5% at full load. To use the current share
feature, connect all current share pins to each other and con-
nect the SENSE pins on each of the converters. The current
sharing function is sensitive to the differential voltage between the
input return pins of paralleled converters. The current sharing
function is also sensitive to noise, and care should be taken in
the routing of connections. Refer to Figure 45 for typical appli-
cation circuits using paralleled converters.
Pin 9 (TEMP)
Pin 9 can be used to indicate case temperature or to raise or
disable the temperature at which thermal shutdown occurs.
Typically, 3.90 V corresponds to +25°C, with a +13.1 mV/°C
change for every 1°C rise. The sensor IC (connected from Pin
9 to the input return (Pin 10)) has a 13.1 kimpedance.
The thermal shutdown feature has been set to shut down the
converter when the case temperature is nominally 110°C to
115°C. To raise the temperature at which shutdown occurs,
connect a resistor with the value shown in Figure 36 from Pin 9
to the input return (Pin 10). To completely disable the tem-
perature shutdown feature, connect a 50 kresistor from Pin 9
to the input return (Pin 10).
–12–
REV. A

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