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參數資料
| 型號： | ADDC02812 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 28 V/100 W DC/DC Converters(帶積分EMI濾波器的DC-DC轉換器) |
| 中文描述： | 中西區區議會28 V/100 / DC轉換器（帶積分的EMI濾波器的的DC - DC轉換器） |
| 文件頁數： | 10/20頁 |
| 文件大小： | 208K |
| 代理商： | ADDC02812 |
–10–
ADDC02812DA/ADDC02815DA
REV. A
V
IL
– V
1.2
1.1
0.7
0.5
2.0
I
I
1.0
1.5
1.0
0.9
0.8
Figure 23. Input Characteristics of Pin 6 When Pulled Low
Pin 7 (SY NC)
Pin 7 can be used for connecting multiple converters to a master
clock. T his master clock can be either an externally user-supplied
clock or it can be a converter that has been modified and desig-
nated 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 con-
tinue 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. T he 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 switch-
ing frequency to accommodate system clock characteristics.
Pin 8 (I
SHARE
)
Pin 8 allows paralleled converters to share the total load cur-
rent, typically within
±
5% at full load. T o use the current share
feature, connect all current share pins to each other and con-
nect the SENSE pins on each of the converters. T he current
sharing function is sensitive to the differential voltage between
the input return pins of paralleled converters. T he current shar-
ing function is also sensitive to noise, and care should be taken
in the routing of connections.
Pin 9 (T E MP)
Pin 9 can be used to indicate case temperature or to raise or
disable the temperature at which thermal shutdown occurs.
T ypically, 3.90 V corresponds to +25
°
C, with a +13.1 mV/
°
C
change for every 1
°
C rise. T he sensor IC (connected from Pin
9 to the input return (Pin 10)) has a 13.1 k
impedance.
T he thermal shutdown feature has been set to shut down the
converter when the case temperature is nominally 110
°
C to
115
°
C. T o raise the temperature at which shutdown occurs,
connect a resistor with the value shown in Figure 24 from Pin 9
to the input return (Pin 10). T o completely disable the tem-
perature shutdown feature, connect a 50 k
resistor from Pin 9
to the input return (Pin 10).
CASE TEMPERATURE –
8
C
1400
R
V
0
120
150
125
130
135
140
145
1200
1000
800
400
200
600
Figure 24. External Resistor Value for Raising Tempera-
ture Shutdown Point
INPUT VOLT AGE RANGE
T he steady state operating input voltage range for the converter
is defined as 18 V to 40 V. T he abnormal operating input volt-
age range is defined as 16 V to 50 V. In accordance with MIL-
ST D-704D, the converter can operate up to 50 V dc input for
transient conditions as long as 50 milliseconds, and it can oper-
ate 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.
T he ADDC02812DA and ADDC02815DA can be modified to
survive, but not work through, the upper limit input voltages
defined in MIL-ST D-704A (aircraft) and MIL-ST D-1275A
(military vehicles). MIL-ST D-704A defines an 80 V surge
that lasts for 1 second before it falls below 50 V, while MIL-
ST D-1275A defines a 100 V surge that lasts for 200 milliseconds
before it falls below 50 V. In both cases, the ADDC02812DA
and ADDC02815DA can be modified to operate to specifica-
tion up to the 50 V input voltage limit and to shut down and
protect itself during the time the input voltage exceeds 50 V.
When the input voltage falls below 50 V as the surge ends, the
converter will automatically initiate a soft start. In order to
survive these higher input voltage surges, the modified converter
will no longer have input transient protection, however, as de-
scribed below.
Contact the factory for information on units surviving high
input voltage surges.
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| ADDS-21XX-EZLITE | RIBBON CABLE, RND/FLAT, 50WAY, PER M; Cores, No. of:50; Conductor make-up:7/36AWG; Impedance:75R; Pitch:1.27mm; Voltage rating, AC:300V; Colour:Grey; Approval Bodies:UL, CSA; Area, conductor CSA:0.072mm2; Cable UL style number:UL RoHS Compliant: Yes |
相關代理商/技術參數 |
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|---|---|
| ADDC02812DA | 制造商:AD 制造商全稱:Analog Devices 功能描述:28 V/100 W DC/DC Converters with Integral EMI Filter |
| ADDC02812DAKV | 制造商:AD 制造商全稱:Analog Devices 功能描述:28 V/100 W DC/DC Converters with Integral EMI Filter |
| ADDC02812DATV | 制造商:AD 制造商全稱:Analog Devices 功能描述:28 V/100 W DC/DC Converters with Integral EMI Filter |
| ADDC02812DATV/883B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC-to-DC Voltage Converter |
| ADDC02812DATV/QMLH | 制造商:AD 制造商全稱:Analog Devices 功能描述:28 V/100 W DC/DC Converters with Integral EMI Filter |
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