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QBK025A0B41-PH Datasheet(PDF) 8 Page - Lineage Power Corporation

Part # QBK025A0B41-PH
Description  36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
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Manufacturer  LINEAGEPOWER [Lineage Power Corporation]
Direct Link  http://www.lineagepower.com
Logo LINEAGEPOWER - Lineage Power Corporation

QBK025A0B41-PH Datasheet(HTML) 8 Page - Lineage Power Corporation

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Data Sheet
March 27, 2008
QBK025A0B DC-DC Power Modules:
36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
LINEAGE POWER
8
Feature Description
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
during a logic high and on during a logic low. Negative
logic, device code suffix "1," is the factory-preferred
configuration. The on/off circuit is powered from an
internal bias supply. 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 Vi (-)
terminal (Von/off). The switch can be an open
collector or equivalent (see Figure 12). A logic low is
Von/off = 0.0V to 0.8V. The typical Ion/off during a
logic low is 10 µA. The switch should maintain a logic-
low voltage while sinking 10µA. During a logic high,
the maximum Von/off generated by the power module
is 5.0V. The maximum allowable leakage current of
the switch at Von/off = 2.0V is 6.0µA. If using an
external voltage source, the maximum voltage V on/off
on the pin is 14.0V with respect to the Vi (-) terminal. If
not using the remote on/off feature, perform one of the
following to turn the unit on:
For negative logic, short ON/OFF pin to VI(-).
For positive logic: leave ON/OFF pin open.
VO(+)
VO(–)
VI(–)
+
Ion/off
ON/OFF
VI(+)
LOAD
Von/off
Figure 10. Circuit configuration for using Remote
On/Off Implementation.
Over Current Protection
To provide protection in a fault output overload
condition, the module is equipped with internal
current-limiting circuitry and can endure current
limiting for a few mili-seconds. If the over current
condition persists beyond a few milliseconds, the
module will shut down and remain latched off. The
over current latch is reset by either cycling the input
power or by toggling the on/off pin for one second. If
the output overload condition still exists when the
module restarts, it will shut down again. This operation
will continue indefinitely until the over current condition
is corrected.
An auto-restart option is also available. An auto-restart
feature continually attempts to restore the operation
until fault condition is cleared.
Input Under/Over Voltage Lockout
At input voltages above or below the input under/over
voltage lockout limits, module operation is disabled.
The module will begin to operate when the input
voltage level changes to within the under and
overvoltage lockout limits.
Over Temperature Protection
These modules feature an over temperature
protection circuit to safeguard against thermal
damage. The circuit shuts down and latches off the
module when the maximum device reference
temperature is exceeded. The module can be
restarted by cycling the dc input power for at least one
second or by toggling the remote on/off signal for at
least one second.
Output Over Voltage Clamp
The output overvoltage clamp consists of a control
circuit, independent of the primary regulation loop, that
monitors the voltage on the output terminals and
clamps the voltage when it exceeds the overvoltage
set point. The control loop of the clamp has a higher
voltage set point than the primary loop. This provides
a redundant voltage control that reduces the risk of
output overvoltage.


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