JFW100G Lineage Power, JFW100G Datasheet - Page 10

• Manufacturer Part Number: JFW100G
• Manufacturer: Lineage Power

dc-dc Converters; 36 to 75 Vdc Input; 2.5 Vdc Output; 25 W to 75 W
Feature Descriptions
Remote On/Off
Primary Remote On/Off
The primary remote on/off signal (ON/OFF) is available
with either positive or negative logic. Positive logic turns
the module on during a logic high and off during a logic
low. Negative logic remote on/off turns the module off
during a logic high and on during a logic low. Negative
logic (code suffix 1) is the factory-preferred configura-
tion.
To turn the power module on and off, the user must sup-
ply a switch to control the voltage between the primary
remote on/off terminal (V
The switch can be an open collector or equivalent (see
Figure 14). A logic low is V
maximum I
should maintain a logic-low voltage while sinking 1 mA.
During a logic high, the maximum V
by the power module is 15 V. The maximum allowable
leakage current of the switch at V
µA.
If not using the primary remote on/off feature, do one of
the following:
n
n
Secondary Remote On/Off
The secondary remote on/off signal (S-ON/OFF pin) is
only available with negative logic. The negative logic
signal turns the module off during a logic high and on
during a logic low. To turn the power module on and off,
the user must supply a switch to control the voltage
between the S-ON/OFF pin and the SENSE(–) pin (V
off, sec
lent (see Figure 14). A logic low is V
V. The maximum I
The switch should maintain a logic-low voltage while
sinking 1 mA.
During a logic high, the maximum V
by the power module is 15 V. The maximum allowable
leakage current of the switch at V
µA.
If not using the secondary remote on/off feature, short
the S-ON/OFF pin to the SENSE(–) pin.
10
10
For negative logic, short the ON/OFF pin to V
For positive logic, leave the ON/OFF pin open.
). The switch can be an open collector or equiva-
on/off, pri
during a logic low is 1 mA. The switch
on/off, sec
(continued)
on/off, pri
during a logic low is 1 mA.
on/off, pri
(continued)
) and the V
on/off, sec
on/off, pri
= 0 V to 1.2 V. The
on/off, sec
on/off, pri
on/off, sec
= 15 V is 50
= 15 V is 50
I
(–) terminal.
generated
generated
= 0 V to 1.2
I
(–).
on/
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 output overvoltage shutdown volt-
age. This limit includes any increase in voltage due to
remote-sense compensation and output voltage set-
point adjustment (trim), see Figure 15.
For remote-sense operation with multiple paralleled
units, see the Forced Load Sharing (Parallel Operation)
section.
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.
O
(+) and SENSE(–) to V
[V
Figure 14. Remote On/Off Implementation
O
(+) – V
V
I
on/off, pri
on/off, pri
+
–
O
(–)] – [SENSE(+) – SENSE(–)] ð 0.5 V
ON/OFF
(PRIMARY)
V
V
I
I
(+)
(–)
O
SENSE(–)
O
(–) at the module.
(+) and V
S- ON/OFF
(SECONDARY)
O
(–) terminals
Lineage Power
April 2008
V
I
on/off, sec
on/off, sec
+
–
8-1398 (C)