FW330 Lineage Power, FW330 Datasheet - Page 13

• Manufacturer Part Number: FW330
• Description: Fw330 Power Modules Dc-dc Converters 36 To 75 Vdc Input, 3.6, 3.3, 2.5, 2.0, Or 1.8 Vdc Output; 180 W To 330 W
• Manufacturer: Lineage Power

April 3, 2008
Feature Descriptions
Remote Sense
Remote sense minimizes the effects of distribution
losses by regulating the voltage at the remote-sense
connections. The voltage between the remote-sense
pins and the output terminals must not exceed the out-
put voltage sense range given in the Feature Specifica-
tions table, i.e.:
The voltage between the V
must not exceed the minimum value indicated in the
output overvoltage shutdown section of the Feature
Specifications table. This limit includes any increase in
voltage due to remote-sense compensation and output
voltage set-point adjustment (trim), see Figure 21.
For remote-sense operation with multiple paralleled
units, see the Forced Load Sharing (Parallel Opera-
tion) section.
Note: The output voltage of this module may be
If not using the remote-sense feature to regulate the out-
put at the point of load, connect SENSE(+) to V
SENSE(–) to V
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
defined 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.
Lineage Power
[V
O
(+) – V
increased to a maximum of 0.5 V. The 0.5 V is
the combination of both the remote sense and
the output voltage set-point adjustment (trim).
O
(–)] – [SENSE(+) – SENSE(–)] ð 0.5 V
O
(–) at the module.
36 to 75 Vdc Input, 3.6, 3.3, 2.5, 2.0, or 1.8 Vdc Output; 180 W to 330 W
O
(+) and V
(continued)
O
(–) terminals
O
(+) and
Figure 21. Effective Circuit Configuration for
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 (R
(V
tion determines the required external-resistor value to
obtain a percentage output voltage change of ý%.
The test results for this configuration are displayed in
Figure 23. This figure applies to all output voltages.
With an external resistor connected between the TRIM
and SENSE(+) pins (R
point (V
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of ý%.
The test results for this configuration are displayed in
Figure 25.
Note: The output voltage of this module may be
R
adj-up
O, adj
SUPPLY
RESISTANCE
R
CONTACT
adj-down
) decreases (see Figure 15). The following equa-
increased to a maximum of 0.5 V. The 0.5 V is
the combination of both the remote sense and
the output voltage set-point adjustment (trim).
=
O, adj
⎛
⎜
⎜
⎝
(
------------------------------------------------------------------------ - 205
V
Single-Module Remote-Sense Operation
) increases (see Figure 24).
I
I
=
O, nom
⎛
⎝
205
--------- - 2.255
Δ%
V
V
adj-down
(
(
I
I
(-)
(+)
1
1.225Δ%
–
+
SENSE(+)
adj-up
SENSE(-)
--------- -
100
Δ%
), the output voltage set point
V
V
), the output voltage set
O
O
)
(+)
⎞ kΩ
⎠
(-)
)
–
1.225
DISTRIBUTION LOSSES
I
O
)
CONTACT AND
–
LOAD
2.255
8-651 (C).e
⎞
⎟
⎟
⎠
kΩ
13