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參數(shù)資料
| 型號(hào)： | LUC025F |
| 廠商： | LINEAGE POWER LLC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 16.5 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 13/15頁(yè) |
| 文件大?。?/td> | 397K |
| 代理商： | LUC025F |
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7
Lineage Power
Data Sheet
April 2008
18 Vdc to 36 Vdc In; 3.3 Vdc Out; 16.5 W
LUC025F Power Module: dc-dc Converter:
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance input source (see Figure 7). Highly
inductive source impedances can affect the stability of
the power module. For the test configuration in Figure
7, a 33 F electrolytic capacitor (ESR < 0.7
Ω at
100 kHz) mounted close to the power module helps
ensure stability 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 60950, CSA C22.2 No. 60950-00, and VDE
0805 (IEC60950).
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements.
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 5 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
The remote on/off signal is referenced to the primary
and is available with either positive or negative logic.
Positive logic remote on/off turns the module on during
a logic-high voltage on the REMOTE ON/OFF pin, and
off during a logic low. Negative logic, device code suffix
“1,” turns the module off during a logic high and on dur-
ing a logic low and is the factory-preferred configura-
tion (see the Feature Specifications table).
To turn the power module output 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 may be an open collector or equivalent (see Fig-
ure 10). A logic low is Von/off = 0 V to 1.2 V. The maxi-
mum 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 10 V. The maximum allowable
leakage current of the switch at Von/off = 10 V is 50 A.
8-758(C).e
Figure 10. Remote On/Off Implementation
VI(+)
ON/OFF
VI(–)
VO(-)
VO(+)
LOAD
+
–
ION/OFF
VON/OFF
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