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參數(shù)資料
| 型號(hào)： | ADDC27005 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 270V/100W DC/DC Converter with Integral EMI Filter(帶積分EMI濾波器的DC-DC轉(zhuǎn)換器) |
| 中文描述： | 270V/100W直流/直流轉(zhuǎn)換器積分EMI過濾器（帶積分的EMI濾波器的的DC - DC轉(zhuǎn)換器） |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 36K |
| 代理商： | ADDC27005 |
3
PIN DESCRIPTIONS
Pin
No.
1
Name
- SENSE
Function
Feedback loop connection for remote
sensing output voltage. Must always
be connected to output return for proper
operation.
Feedback loop connection for remote
sensing output voltage. Must always
be connected to +Vout for proper
operation.
Adjusts output voltage setpoint.
Indicates output voltage is within
±
5%
of nominal. Active high referenced to -
SENSE (pin 1).
Low level dc auxiliary voltage supply
referenced to input return (pin 10).
Power supply disable. Active low and
referenced to input return (pin 10).
Clock synchronization input for
multiple units; referenced to input
return (pin 10).
Current share pin which allows
paralleled units to share current
typically within
±
5% at full load;
referenced to input return (pin 10).
Case temperature indicator and
temperature shutdown override;
referenced to input return (pin 10).
Input return.
+270V nominal input bus.
+5Vdc output.
+5Vdc output.
+5Vdc output.
Output return.
Output return.
Output return.
2
+ SENSE
3
4
ADJUST
STATUS
5
Vaux
6
INHIBIT
7
SYNC
8
Ishare
9
TEMP
10
11
12
13
14
15
16
17
- Vin
+ Vin
+Vout
+Vout
+Vout
RETURN
RETURN
RETURN
Pin Configuration
Top
View
1
11
12
17
Advance Information, Dec 97, rev. 0
Basic Operation
The ADDC27005SA design is 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-STD-461D
when installed in a typical system setup.
The design uses current mode control and employs a high
performance opto-isolator to maintain isolation between input
and output. The converter is designed to give nearly a constant
output current as the output voltage drops from Vnom to Vshckt
during a short circuit condition. It does not let the current fold
back below the maximum rated output current. The overvoltage
protection circuitry 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 0.25Vdc
between the converter and the load, thereby maintaining an
accurate voltage level at the load.
An internal temperature sensor shuts down the unit and prevents
it from becoming too hot if the heat removal system fails. The
temperature sensed is the case temperature and is factory set to
trip at a nominal case temperature of 115
°
C. The shut down
temperature setting can be raised externally or disabled by the
user.
Each unit has an inhibit pin which can be used to turn off the
converter. This 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
frequency. This feature is particularly useful in eliminating beat
frequencies, which may cause increased output ripple on
paralleled units. A current share pin (Ishare) is available which
permits paralleled units to share current typically within
±
5% at
full load.
An auxiliary, low level dc bias voltage referenced to input return
is provided for miscellaneous system use.
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