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參數(shù)資料
| 型號(hào)： | ADDC02828SATV |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 28 V/100 W DC/DC Converter with Integral EMI Filter |
| 中文描述： | 2-OUTPUT 100 W DC-DC UNREG PWR SUPPLY MODULE |
| 封裝： | HERMETIC SEALED, HYBRID PACKAGE-17 |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | ADDC02828SATV |
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ADDC02828SA
REV. 0
–7–
BASIC OPE RAT ION
T he ADDC02828SA converter uses a flyback topology with
dual interleaved power trains operating 180
°
out of phase. Each
power train switches at a fixed frequency of 500 kHz, resulting
in a 1 MHz fixed switching frequency as seen at the input and
output of the converter. In a flyback topology, energy is stored
in the inductor during one half portion of the switching cycle
and is then transferred to the output filter during the next half
portion. With two interleaved power trains, energy is transferred
to the output filter during both halves of the switching cycle,
resulting in smaller filters to meet the required ripple.
A five pole differential input EMI filter, along with a common-
mode EMI capacitor and careful attention to layout parasitics, is
designed to meet all applicable requirements in MIL-ST D-461D
when installed in a typical system setup. A more detailed dis-
cussion of CE102 and other EMI issues is included in the sec-
tion entitled EMI Considerations.
T he converter uses current mode control and employs a high
performance opto-isolator in its feedback path to maintain isola-
tion between input and output. T he control circuit is designed
to give a nearly constant output current as the output voltage
drops from V
O
nom to V
SC
during a short circuit condition. It
does not let the current fold back below the maximum rated
output current. T he output overvoltage protection circuitry,
which is independent from the normal feedback loop, protects
the load against a break in the remote sense leads. Remote
sense connections, which can be made at the load, can adjust
for voltage drops of as much as 0.25 V dc between the converter
and the load, thereby maintaining an accurate voltage level at
the load.
An input overvoltage protection feature shuts down the con-
verter when the input voltage exceeds (nominally) 52.5 V dc.
An internal temperature sensor shuts down the unit and pre-
vents it from becoming too hot if the heat removal system fails.
T he temperature sensed is the case temperature and is factory
set to trip at a nominal case temperature of 110
°
C to 115
°
C.
T he shut-down temperature setting can be raised externally or
disabled by the user.
Each unit has an INHIBIT pin that can be used to turn off the
converter. T his feature can be used to sequence the turn-on of
multiple converters and to reduce input power draw during
extended time in a no load condition.
A SYNC pin, referenced to the input return line (Pin 10), is
available to synchronize multiple units to one switching fre-
quency. T his feature is particularly useful in eliminating beat
frequencies that may cause increased output ripple on paralleled
units. A current share pin (I
SHARE
) is available that permits
paralleled units to share current, typically within 5% at full load.
A low level dc auxiliary voltage supply referenced to the input
return line is provided for miscellaneous system use.
PIN CONNE CT IONS
Pins 1 and 2 (
6
SE NSE )
Pins 1 and 2 must always be connected for proper operation,
although failure to make these connections will not be catastrophic
to the converter under normal operating conditions. If no load
is present on the converter, failure to make these connections
could result in damage to the device. If the ADDC02828SA is
used to provide a +28 V dc output, Pin 1 must always be con-
nected to the output sense reference (Pins 14 and 15) and Pin 2
must always be connected to +V
OUT
(Pins 12 and 13). If the
ADDC02828SA is used to provide a –28 V dc output, Pin 1
must always be connected to RET URN (Pins 16 and 17) and
Pin 2 must always be connected to the output sense reference
(Pins 14 and 15). T he connections to +V
OUT
(for a +28 V dc
output) and RET URN (for a –28 V dc output) 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. T he 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 mar-
gin. Consult factory if long remote sense leads are to be used.
Pin 3 (ADJUST )
An adjustment pin is provided so the user can change the nomi-
nal output voltage during the prototype stage. Since very low
temperature coefficient resistors are used to set the output volt-
age and maintain tight regulation over temperature, using stan-
dard 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 ad-
justed 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. T he
ADJUST function is sensitive to noise, and care should be taken
in the routing of connections.
T o make the output voltage higher, place a resistor from ADJUST
(Pin 3) to –SENSE (Pin 1). T o make the output voltage lower,
place a resistor from ADJUST (Pin 3) to +SENSE (Pin 2).
Figures 16 and 17 show resistor values for a
±
5% change in
output voltage:
OUTPUT VOLTAGE – %
8
7
R
1
99
95
98
97
96
5
4
3
2
6
Figure 16. External Resistor Value for Reducing Output
Voltage
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