JAW075B Lineage Power, JAW075B Datasheet - Page 9

• Manufacturer Part Number: JAW075B
• Manufacturer: Lineage Power

April 2008
Feature Descriptions
Remote On/Off
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 output overvoltage pro-
tection voltage as indicated in the Feature Specifica-
tions table. This limit includes any increase in voltage
due to remote-sense compensation and output voltage
set-point adjustment (trim). See Figure 15.
If not using the remote-sense feature to regulate the
output at the point of load, then connect 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
O
(+) and SENSE(–) to V
[V
O
Figure 14. Remote On/Off Implementation
(+) – V
V
I
on/off
on/off
+
–
O
(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5 V
ON/OFF
V
V
I
I
(+)
(–)
(continued)
O
O
(–) at the module.
(+) and V
SENSE(+)
SENSE(–)
(continued)
V
V
O
O
(+)
(–)
O
(–) terminals
36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W
8-720 (F).c
LOAD
Figure 15. 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 Δ%.
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 Δ%.
The voltage between the V
must not exceed the minimum output overvoltage pro-
tection voltage as indicated in the Feature Specifica-
tions table. This limit includes any increase in voltage
due to remote-sense compensation and output voltage
set-point adjustment (trim). See Figure 15.
R
O, adj
adj-up
R
SUPPLY
RESISTANCE
adj-down
) decreases (see Figure 16). The following equa-
CONTACT
O, adj
=
⎛
⎜
⎜
⎝
(
------------------------------------------------------------------------- - 1000
Single-Module Remote-Sense Operation
V
) increases (see Figure 17).
=
O nom
I
I
,
⎛
⎝
1000
------------ - 11
Δ%
adj-down
)
V
V
(
1.225Δ%
I
I
(+)
(–)
1
–
adj-up
+
SENSE(+)
SENSE(–)
), the output voltage set point
------- -
100
Δ%
⎞ kΩ
⎠
O
V
), the output voltage set
V
O
(+) and V
O
(+)
(–)
)
–
1.225
DISTRIBUTION LOSSES
I
O
O
CONTACT AND
(–) terminals
LOAD
–
11
8-651 (F).m
⎞
⎟
⎟
⎠
kΩ
9