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参数资料
| 型号： | LUW025F |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 16.5 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 14/15页 |
| 文件大小： | 700K |
| 代理商： | LUW025F |
8
Tyco Electronics Corp.
Data Sheet
November 2001
36 Vdc to 75 Vdc In; 3.3 Vdc and 5 Vdc Out; 16.5 W and 25 W
LUW025-Series Power Modules: dc-dc Converters:
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).
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:
s
The input source is to be provided with reinforced
insulation from any other hazardous voltages, includ-
ing 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 pins 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 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 configuration
(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-
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.
8-758e
Figure 13. Remote On/Off Implementation
Output Voltage Set-Point Adjustment
(Trim)
Output voltage adjustment (trim) allows the user to
increase or decrease the output voltage set point of a
module. This is accomplished by connecting an exter-
nal resistor between the TRIM pin and either the VO(+)
or VO(–) pin.
Connecting an external resistor between the TRIM pin
and VO(–) pin (Radj-down) decreases the output voltage
set point (see Figure 14). In order to maintain the out-
put voltage accuracy, the trim resistor tolerance should
be ±0.1%.
+
Ion/off
-
Von/off
REMOTE
ON/OFF
VI(+)
VI(-)
LOAD
VO(-)
VO (+)
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