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參數(shù)資料
| 型號(hào)： | FW250B1 |
| 廠商： | LINEAGE POWER LLC |
| 元件分類(lèi)： | 電源模塊 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 3/20頁(yè) |
| 文件大?。?/td> | 557K |
| 代理商： | FW250B1 |
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Lineage Power
11
Data Sheet
April 2008
36 Vdc to 75 Vdc Input, 12 Vdc Output; 250 W to 300 W
FW250B1 and FW300B1 Power Modules: dc-dc Converters:
Feature Descriptions (continued)
Output Voltage Set-Point Adjustment (Trim)
(continued)
8-1172 (C).e
Figure 16. Resistor Selection for Increased Output
Voltage
Output Overvoltage Protection
The output voltage is monitored at the VO(+) and VO(–)
pins of the module. If the voltage at these pins exceeds
the value indicated in the Feature Specications table,
the module will shut down and latch off. Recovery from
latched 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.
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 Specications table. For example, on the
FW250B1, the V/A ratio is set at 180 mV/A
± 10% @
70
°C case. At a full load current of 20.8 A, the voltage
on the CURRENT MON pin is 3.74 V. The current mon-
itor signal is referenced to the SENSE(–) pin on the
secondary and is supplied from a source impedance of
approximately 2 k
. It is recommended that the CUR-
RENT 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 CUR-
RENT MON pin with an external source will detrimen-
tally 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 conguration; 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 mod-
ule’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 rst
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.
0
24
6
10
10M
ADJUSTMENT
RESISTOR
VALUE
(
)
1M
100k
10k
8
PERCENT CHANGE IN OUTPUT VOLTAGE (
%)
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| FW300A1-A | 1-OUTPUT 300 W DC-DC REG PWR SUPPLY MODULE |
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