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FW300A1 Fiches technique(PDF) 10 Page - Lineage Power Corporation

No de pièce FW300A1
Description  dc-dc Converters 36 to 75 Vdc Input, 5 Vdc Output 250 W to 300 W
Download  20 Pages
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Fabricant  LINEAGEPOWER [Lineage Power Corporation]
Site Internet  http://www.lineagepower.com
Logo LINEAGEPOWER - Lineage Power Corporation

FW300A1 Fiches technique(HTML) 10 Page - Lineage Power Corporation

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10
10
Lineage Power
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 250 W to 300 W
FW250A1 and FW300A1 Power Modules:
Safety Considerations
For safety-agency approval of the system in which the
power module is used, the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standard,
i.e.,
UL1950, CSA C22.2 No. 950-95, and VDE 0805
(EN60950, IEC950).
If the input source is non-SELV (ELV or a hazardous
voltage greater than 60 Vdc and less than or equal to
75 Vdc), for the module’s output to be considered meet-
ing the requirements of safety extra-low voltage
(SELV), all of the following must be true:
s
The input source is to be provided with reinforced
insulation from any hazardous voltages, including the
ac mains.
s
One VI pin and one VO pin are to be grounded or both
the input and output pins are to be kept floating.
s
The input pins of the module are not operator acces-
sible.
s
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.
Note: Do not ground either of the input pins of the
module without grounding one of the output pins.
This may allow a non-SELV voltage to appear
between the output pin and ground.
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
tailout characteristics (output-current decrease or
increase). The unit operates normally once the output
current is brought back into its specified range.
Remote On/Off
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 17). A logic
low is Von/off = 0 V to 1.2 V, during which the module is on.
The maximum Ion/off during a logic low is 1 mA. The switch
should maintain a logic-low voltage while sinking 1 mA.
During a logic high, the maximum Von/off generated by
the power module is 15 V. The maximum allowable
leakage current of the switch at Von/off = 15 V is 50 µA.
If not using the remote on/off feature, short the
ON/OFF pin to VI(–).
8-580 (C).d
Figure 17. Remote On/Off Implementation
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.:
[VO(+) – VO(–)] – [SENSE(+) – SENSE(–)]
≤ 0.7 V
The voltage between the VO(+) and VO(–) terminals
must not exceed the minimum value indicated in the
output overvoltage shutdown section of the Feature
Specifications table. This limit includes any increase in
voltage due to remote-sense compensation and output
voltage set-point adjustment (trim), see Figure 18.
If not using the remote-sense feature to regulate the out-
put at the point of load, connect SENSE(+) to VO(+) and
SENSE(–) to VO(–) at the module.
+
Ion/off
Von/off
CASE
ON/OFF
VI(+)
VI(–)
SENSE(+)
SENSE(–)
VO(+)
VO(–)


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