JC075F Lineage Power, JC075F Datasheet - Page 9

• Manufacturer Part Number: JC075F
• Manufacturer: Lineage Power

Feature Descriptions
Remote On/Off
Two remote on/off options are available. Positive logic
remote on/off turns the module on during a logic-high
voltage on the ON/OFF pin, and off during a logic low.
Negative logic remote on/off turns the module off dur-
ing 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
supply a switch to control the voltage between the
on/off terminal and the V
switch can be an open collector or equivalent (see
Figure 16). A logic low is V
maximum I
should maintain a logic-low voltage while sinking 1 mA.
During a logic high, the maximum V
the power module is 15 V. The maximum allowable
leakage current of the switch at V
If not using the remote on/off feature, do one of the fol-
lowing:
n
n
Figure 16.Remote On/Off Implementation
For negative logic, short ON/OFF pin to V
For positive logic, leave ON/OFF pin open.
Data Sheet
March 2008
Lineage Power
V
I
on/off
on/off
+
on/off
–
during a logic low is 1 mA. The switch
ON/OFF
V
V
I
I
(+)
(–)
I
(–) terminal (V
on/off
SENSE(+)
SENSE(–)
= 0 V to 1.2 V. The
on/off
V
V
O
O
on/off
(+)
(–)
= 15 V is 50 μA.
on/off
generated by
). The
I
(–).
JC050F, JC075F, JC100F Power Modules: dc-dc Converters;
LOAD
8-720 c
18 Vdc to 36 Vdc Input, 3.3 Vdc Output; 33 W to 66 W
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 3.8 V. This limit includes any increase
in voltage due to remote-sense compensation and out-
put voltage set-point adjustment (trim), see Figure 17.
If not using the remote-sense feature to regulate the
output at the point of load, then connect SENSE(+) to
V
Figure 17. 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. With an external resistor between the
TRIM and SENSE(–) pins (R
set point (V
lowing equation determines the required external-resis-
tor value to obtain a percentage output voltage change
of Δ%.
The test results for this configuration are displayed in
Figure 19. This figure applies to all output voltages.
With an external resistor connected between the TRIM
and SENSE(+) pins (R
point (V
O
(+) and SENSE(–) to V
[V
SUPPLY
RESISTANCE
O
CONTACT
(+) – V
O, adj
O, adj
) increases (see Figure 20).
Single-Module Remote-Sense Operation
R
I
I
adj-down
O
(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5 V
) decreases (see Figure 18). The fol-
V
V
I
I
(+)
(-)
=
adj-up
SENSE(+)
SENSE(–)
⎛
⎝
O
100
--------- - 2
Δ%
V
V
O
(–) at the module.
), the output voltage set
O
O
(+) and V
(+)
adj-down
(–)
–
⎞ kΩ
⎠
DISTRIBUTION LOSSES
), the output voltage
I
O
O
CONTACT AND
(–) terminals
LOAD
8-651 m
9