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ADDC02828SATV 데이터시트(PDF) 9 Page - Analog Devices

부품명 ADDC02828SATV
상세설명  28 V/100 W DC/DC Converter with Integral EMI Filter
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ADDC02828SA
REV. 0
–9–
VIL – V
1.2
1.1
0.7
0.5
2.0
1.0
1.5
1.0
0.9
0.8
Figure 21. 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 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
ensure that if the master clock stops working the individual
units will continue to operate at their own internal clock fre-
quency, thereby eliminating a potential single point failure.
Capacitive coupling will also permit a wider duty cycle to be
used. The SYNC pin has an internal pull-down so it is not
necessary to sink any current when driving the pin low. Reference
Figure 28 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 modified standard switch-
ing 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 27 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 22 from Pin 9
to the input return (Pin 10). To completely disable the tem-
perature 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 22. 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 volt-
age 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 oper-
ate down to 16 V dc input for continuous operation during
emergency conditions. Figure 3 (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 ADDC02828SA 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 before it falls below 50 V. In both cases,
the ADDC02828SA can be modified to operate to specification
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, however, will
no longer have input transient protection as described below.
Contact the factory for information on units surviving high input
voltage surges.
Input Voltage Transient Protection: The converter has a
transient voltage suppressor connected across its input leads to
protect the unit against high voltage pulses (both positive and
negative) of short duration. With the power supply connected
in the typical system setup shown in Figure 15, a transient
voltage pulse is created across the converter in the following
manner. A 20
µF capacitor is first charged to 400 V. It is then
connected directly across the converter’s end of the two meter
power lead cable through a 2
Ω on-state resistance MOSFET.


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