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參數(shù)資料
| 型號： | FW400R61-18 |
| 廠商： | LINEAGE POWER LLC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 392 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | MODULE-20 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 412K |
| 代理商： | FW400R61-18 |
Lineage Power
Data Sheet
April 03, 2008
36 Vdc to 75 Vdc Input, 28 Vdc Output; 400 W
FW400R1 Power Module; dc-dc Converter:
Feature Descriptions (continued)
Output Current Monitor
The CURRENT MON pin provides a dc voltage propor-
tional to the dc output current of the module given in
the Feature Specifications table. For example, on the
FW400R1, the V/A ratio is set at 370 mV/A ± 10% @
70
°C case. At a full load current of 9 A, the voltage on
the CURRENT MON pin is 3.33 V. The current monitor
signal is referenced to the SENSE(–) pin on the sec-
ondary and is supplied from a source impedance of
approximately 2 k
Ω. It is recommended that the
CURRENT MON pin be left open when not in use,
although no damage will result if the CURRENT MON
pin is shorted to secondary ground. Directly driving the
CURRENT MON pin with an external source will
detrimentally affect operation of the module and should
be avoided.
Synchronization
Any module can be synchronized to any other module
or to an external clock using the SYNC IN or SYNC
OUT pins. The modules are not designed to operate in
a master/slave configuration; that is, if one module
fails, the other modules will continue to operate.
SYNC IN Pin
This pin can be connected either to an external clock or
directly to the SYNC OUT pin of another FW250x or
FW300x module.
If an external clock signal is applied to the SYNC IN
pin, the signal must be a 500 kHz (±50 kHz) square
wave with a 4 Vp-p amplitude. Operation outside this
frequency band will detrimentally affect the perfor-
mance of the module and must be avoided.
If the SYNC IN pin is connected to the SYNC OUT pin
of another module, the connection should be as direct
as possible, and the VI(–) pins of the modules must be
shorted together.
Unused SYNC IN pins should be tied to VI(–). If the
SYNC IN pin is unused, the module will operate from
its own internal clock.
SYNC OUT Pin
This pin contains a clock signal referenced to the VI(–)
pin. The frequency of this signal will equal either the
module’s internal clock frequency or the frequency estab-
lished by an external clock applied to the SYNC IN pin.
When synchronizing several modules together, the
modules can be connected in a daisy-chain fashion
where the SYNC OUT pin of one module is connected
to the SYNC IN pin of another module. Each module in
the chain will synchronize to the frequency of the first
module in the chain.
To avoid loading effects, ensure that the SYNC OUT
pin of any one module is connected to the SYNC IN pin
of only one module. Any number of modules can be
synchronized in this daisy-chain fashion.
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with an overtemperature shutdown circuit.
The shutdown circuit will not engage unless the unit is
operated above the maximum case temperature.
Recovery from overtemperature shutdown is
accomplished by cycling the dc input power off for at
least 1.0 second or toggling the primary referenced
on/off signal for at least 1.0 second.
Forced Load Sharing (Parallel Operation)
For either redundant operation or additional power
requirements, the power modules can be configured for
parallel operation with forced load sharing (see Figure
15). For a typical redundant configuration, Schottky
diodes or an equivalent should be used to protect
against short-circuit conditions. Because of the remote
sense, the forward-voltage drops across the Schottky
diodes do not affect the set point of the voltage applied
to the load. For additional power requirements, where
multiple units are used to develop combined power in
excess of the rated maximum, the Schottky diodes are
not needed.
Good layout techniques should be observed for noise
immunity. To implement forced load sharing, the follow-
ing connections must be made:
n
The parallel pins of all units must be connected
together. The paths of these connections should be
as direct as possible.
n
All remote-sense pins should be connected to the
power bus at the same point, i.e., connect all
SENSE(+) pins to the (+) side of the power bus at the
same point and all SENSE(–) pins to the (–) side of
the power bus at the same point. Close proximity and
directness are necessary for good noise immunity.
When not using the parallel feature, leave the
PARALLEL pin open.
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