FC250A1 Lineage Power, FC250A1 Datasheet - Page 7

• Manufacturer Part Number: FC250A1
• Description: CONVERTER DC/DC 2.5V 100W OUT
• Manufacturer: Lineage Power
• Series: FC250r
• Type: Isolated with Remote On/Offr

Specifications of FC250A1

• Output: 2.5V
• Number Of Outputs: 1
• Power (watts): 50W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: Module
• 1st Output: 2.5 VDC @ 40A
• Size / Dimension: 2.40" L x 2.28" W x 0.50" H (61mm x 57.9mm x 12.7mm)
• Power (watts) - Rated: 100W
• Operating Temperature: -40°C ~ 100°C
• Efficiency: 85%
• Approvals: CSA, UL, VDE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -

July 1998
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the power mod-
ule. For the test configuration in Figure 7, a 100 µF
electrolytic capacitor (ESR < 0.7
mounted close to the power module helps ensure sta-
bility of the unit. For other highly inductive source
impedances, consult the factory for further application
guidelines.
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., UL 1950, 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
meeting the requirements of safety extra-low voltage
(SELV), all of the following must be true:
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 15 A normal-blow fuse in the ungrounded lead.
Tyco Electronics Corp.
The input source is to be provided with reinforced
insulation from any other hazardous voltages, includ-
ing the ac mains.
One V
both 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 pins and ground.
I
pin and one V
O
pin are to be grounded, or
at 100 kHz)
18 Vdc to 36 Vdc Input, 5 Vdc Output; 50 W
Feature Descriptions
Overcurrent Protection
To provide protection in a fault (output overload) condi-
tion, the unit is equipped with internal current-limiting
circuitry and delayed overcurrent shutdown.
At the point of current-limit inception, the unit shifts
from voltage control to current control. If the output volt-
age is pulled very low during a severe fault, the current-
limit circuit can exhibit either foldback or tailout charac-
teristics (output current decrease or increase). If the
overcurrent persists for more than 50 ms, the unit will
latch off.
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, device code suffix “1,” is the factory-preferred
configuration.
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 10). 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
following to turn the unit on:
For negative logic, short the ON/OFF pin to V
For positive logic, leave the ON/OFF pin open.
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
= 15 V is 50 µA.
on/off
generated by
). The
I
(–).
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