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ADDC02805SA データシート(PDF) 10 Page - Analog Devices

部品番号 ADDC02805SA
部品情報  28 V/66 W/100 W DC/DC Converters with Integral EMI Filter
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ホームページ  http://www.analog.com
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ADDC02805SA データシート(HTML) 10 Page - Analog Devices

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ADDC02803SC/ADDC02805SA
REV. A
–10–
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 con-
verter off. For normal operation, the inhibit pin is internally pulled
up to 12 V. Use of an open collector circuit is recommended.
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 milliseconds to initiate a full soft start. Shorter off times
will result in a partial soft start. Figure 31 shows the input
characteristics of Pin 6.
VIL – V
1.2
1.1
0.7
0.5
2.0
1.0
1.5
1.0
0.9
0.8
Figure 31. Input Characteristics of Pin 6 When Pulled Low
Pin 7 (SYNC)
Pin 7 can be used for connecting multiple converters to a mas-
ter clock. This master clock can be either an externally user-
supplied clock or a converter that has been modified and
designated as a master unit. Capacitive coupling of the clock
signal will ensure 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. Reference Figure 38 for a
fault tolerant, secondary side powered SYNC drive circuit.
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 modi-
fied 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 37 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 k
Ω impedance.
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 32 from Pin 9
to the input return (Pin 10). To completely disable the tempera-
ture shutdown feature, connect a 50 k
Ω resistor from Pin 9 to
the input return (Pin 10).
SHUTDOWN CASE TEMPERATURE – C
1400
0
120
150
125
130
135
140
145
1200
1000
800
400
200
600
Figure 32. External Resistor Value for Raising
Temperature Shutdown Point
INPUT VOLTAGE RANGE
The steady state operating input voltage range for the converter
is defined as 18 V to 40 V. The abnormal operating input
voltage range is defined as 16 V to 50 V. In accordance with
MIL-STD-704D, the converter can operate up to 50 V dc
input for transient conditions as long as 50 milliseconds, and it
can operate down to 16 V dc input for continuous operation
during emergency conditions. Figure 4 (typical low line dropout
vs. load) shows that the converter can work continuously down
to and below 16 V dc under reduced load conditions.
The ADDC02803SC and ADDC02805SA can be modified to
survive, but not work through, the upper limit input voltages
defined in MIL-STD-704A (aircraft) and MIL-STD-1275A
(military vehicles). MIL-STD-704A defines an 80 V surge that
lasts for 1 second before it falls below 50 V, while MIL-STD-
1275A defines a 100 V surge that lasts for 200 milliseconds


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