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參數(shù)資料
| 型號： | FW250B1 |
| 廠商： | LINEAGE POWER LLC |
| 元件分類： | 電源模塊 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 557K |
| 代理商： | FW250B1 |
10
Lineage Power
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)
Output voltage trim allows the user to increase or
decrease the output voltage set point of a module. This
is accomplished by connecting an external resistor
between the TRIM pin and either the SENSE(+) or
SENSE(–) pins. The trim resistor should be positioned
close to the module.
If not using the trim feature, leave the TRIM pin open.
With an external resistor between the TRIM and
SENSE(–) pins (Radj-down), the output voltage set point
(VO, adj) decreases (see Figure 13). The following equa-
tion determines the required external-resistor value to
obtain a percentage output voltage change of
%.
The test results for this conguration are displayed in
Figure 14. This gure applies to all output voltages.
With an external resistor connected between the TRIM
and SENSE(+) pins (Radj-up), the output voltage set
point (VO, adj) increases (see Figure 15).
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of
%.
The test results for this conguration are displayed in
Figure 16.
The voltage between the VO(+) and VO(–) terminals
must not exceed the minimum value of the output over-
voltage protection as indicated in the Feature Speci-
cations table. This limit includes any increase in voltage
due to remote-sense compensation and output voltage
set-point adjustment (trim). See Figure 12.
Although the output voltage can be increased by both
the remote sense and by the trim, the maximum
increase for the output voltage is not the sum of both.
The maximum increase is the larger of either the
remote sense or the trim. Consult the factory if you
need to increase the output voltage more than the
above limitation.
The amount of power delivered by the module is
dened as the voltage at the output terminals multiplied
by the output current. When using remote sense and
trim, the output voltage of the module can be
increased, which at the same output current would
increase the power output of the module. Care should
be taken to ensure that the maximum output power of
the module remains at or below the maximum rated
power.
8-748 (C).b
Figure 13. Circuit Conguration to Decrease
Output Voltage
8-1171 (C).g
Figure 14. Resistor Selection for Decreased Output
Voltage
8-715 (C).b
Figure 15. Circuit Conguration to Increase
Output Voltage
Radj-down
205
%
----------
2.255
–
k
=
Radj-up
VO, nom 1
%
100
----------
+
() 1.225
–
()
1.225
%
()
------------------------------------------------------------------------- 205
2.255
–
k
=
VI(+)
VI(–)
ON/OFF
CASE
VO(+)
VO(–)
SENSE(+)
TRIM
SENSE(–)
Radj-down
RLOAD
0
102030
40
1M
PERCENT CHANGE IN OUTPUT VOLTAGE (
%)
100k
10k
1k
ADJUSTMENT
RESISTOR
VALUE
(
)
VI(+)
VI(–)
ON/OFF
CASE
VO(+)
VO(–)
SENSE(+)
TRIM
SENSE(–)
Radj-up
RLOAD
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