JW075B Lineage Power, JW075B Datasheet - Page 10

• Manufacturer Part Number: JW075B
• Manufacturer: Lineage Power

JW050B, JW075B, JW100B, JW150B Power Modules:
Note: Do not ground either of the input pins of the
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
The input to these units is to be provided with a maxi-
mum 20 A normal-blow fuse in the ungrounded lead.
Feature Descriptions
Overcurrent Protection
To provide protection in a fault (output overload) condi-
tion, the unit is equipped with internal current-limiting
circuitry and can endure current limiting for an unlim-
ited duration. At the point of current-limit inception, the
unit shifts from voltage control to current control. If the
output voltage is pulled very low during a severe fault,
the current-limit circuit can exhibit either foldback or tai-
lout characteristics (output current decrease or
increase). The unit operates normally once the output
current is brought back into its specified range.
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 20). 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
10
10
dc-dc Converters; 36 to 75 Vdc Input, 12 Vdc Output; 50 W to 150 W
the input and output pins are to be kept floating
The input pins of the module are not operator acces-
sible.
Another SELV reliability test is conducted on the
whole system, as required by the safety agencies, on
the combination of supply source and the subject
module to verify that under a single fault, hazardous
voltages do not appear at the module’s output.
module without grounding one of the output pins.
This may allow a non-SELV voltage to appear
between the output pin and ground.
on/off
during a logic low is 1 mA. The switch
I
(–) terminal (V
on/off
= 0 V to 1.2 V. The
on/off
on/off
generated by
). The
leakage current of the switch at V
If not using the remote on/off feature, do one of the
following:
For negative logic, short ON/OFF pin to V
For positive logic, leave ON/OFF pin open.
Figure 20. Remote On/Off Implementation
V
I
on/off
on/off
+
–
ON/OFF
V
V
I
I
(–)
(+)
SENSE(+)
SENSE(–)
on/off
V
V
O
O
(+)
(–)
= 15 V is 50 µA.
Data Sheet
I
(–).
April 2008
Lineage Power
8-720 (C).c
LOAD