LC010CL datasheet(15/24 Pages) GE

15 / 24 page

Lineage Power

Data Sheet

March 27, 2008

18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 10 W and 15 W

LC/LW010- and LC/LW015-Series Power Modules:

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. If the source inductance exceeds 4 µH, a 33 µF

electrolytic capacitor (ESR < 0.7

Ω at 100 kHz)

mounted close to the power module helps ensure

stability of the unit.

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 22.2 No. 950-95, EN60950, and

IEC950.

For the converter output to be considered meeting the

requirements of safety extra-low voltage (SELV), one of

the following must be true of the dc input:

All inputs are SELV and floating, with the output also

floating.

All inputs are SELV and grounded, with the output

also grounded.

Any non-SELV input must be provided with rein-

forced insulation from any other hazardous voltages,

including the ac mains, and must have a SELV reli-

ability test performed on it in combination with the

converters.

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

Output Overvoltage Clamp

The output overvoltage clamp consists of control cir-

cuitry, independent of the primary regulation loop, that

monitors the voltage on the output terminals. This con-

trol loop has a higher voltage set point than the primary

loop (see Feature Specifications table). In a fault condi-

tion, the overvoltage clamp ensures that the output

voltage does not exceed VO, clamp, max. This provides a

redundant voltage-control that reduces the risk of

output overvoltage.

Current Limit

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 (Optional)

Two remote on/off options are available. Positive logic,

device code suffix “4”, 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”, remote on/off turns the module off dur-

ing a logic high and on 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 VI(–) terminal (Von/off). The

switch may be an open collector or equivalent (see

Figure 38). A logic low is Von/off = –0.7 V to +1.2 V. 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 10 V. The maximum allowable

leakage current of the switch at Von/off = 10 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.

8-758(C).a

Figure 38. Remote On/Off Implementation

Ion/off

Von/off

REMOTE

ON/OFF

VI(+)

VI(-)

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