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參數(shù)資料
| 型號(hào)： | SMLW010G |
| 英文描述： | SMLW010 Single-Output Low-Profile Power Modules: 36 Vdc to 75 Vdc Input; 10 W |
| 中文描述： | SMLW010單輸出低壓電源模塊簡(jiǎn)介：36伏到75伏直流輸入; 10瓦 |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 222K |
| 代理商： | SMLW010G |
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Data Sheet
January 2002
Power Modules: 36 Vdc to 75 Vdc Input; 10 W
SMLW010 Single-Output Low-Profile
Tyco Electronics Corp.
7
Safety Considerations
SMLW Modules
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 (EN60950).
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:
■
The input source is to be provided with reinforced
insulation from any other hazardous voltages, includ-
ing the ac mains.
■
One V
I
pin and one V
O
pin are to be grounded or
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.
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
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.
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
I
(–) terminal (V
on/off
). The
switch may be an open collector or equivalent (see
Figure 4). A logic low is V
on/off
= –0.7 V to 1.2 V. The
maximum I
on/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 V
on/off
generated by
the power module is 6 V. The maximum allowable leak-
age current of the switch at V
on/off
= 6 V is 50 μA.
The module has internal capacitance to reduce noise
at the ON/OFF pin. Additional capacitance is not gen-
erally needed and may degrade the start-up character-
istics of the module.
8-758a
Figure 4. Remote On/Off Implementation
Output Voltage Adjustment
Output voltage set-point adjustment 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 V
O
(+)
or V
O
(–) pins. With an external resistor between the
TRIM and V
O
(+) pins (R
adj-down
), the output voltage set
point (V
O, adj
) decreases (see Figure 5). The following
equation determines the required external resistor
value to obtain an output voltage change from V
O, nom
to
V
O, adj
:
V
O nom
,
V
O adj
–
(
where R
adj-down
is the resistance value connected
between TRIM and V
O
(+), and G, H, and L are defined
in the table below.
+
I
on/off
-
V
on/off
REMOTE
ON/OFF
V
I
(+)
V
I
(-)
R
adj-down
,
---------------------------------------
,
)
H
–
=
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