AV45C datasheet(18/25 Pages) ASTEC

18 / 25 page

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module must be installed in compliance with the

spacing and separation requirements of the

end-use safety agency standard, i.e., UL1950,

CSA C22.2 No. 950-95, and EN60950. The

input-to-output 1500VDC isolation is an opera-

tional insulation. The DC/DC power module

should be installed in end-use equipment, in

compliance with the requirements of the ulti-

mate application, and is intended to be supplied

by an isolated secondary circuit. When the sup-

ply to the DC/DC power module meets all the

requirements for SELV(<60Vdc), the output is

considered to remain within SELV limits (level

3). If connected to a 60Vdc power system, dou-

ble or reinforced insulation must be provided in

the power supply that isolates the input from

any hazardous voltages, including the ac

mains. One input pin and one output pin are to

be grounded or both the input and output pins

are to be kept floating. Single fault testing in

the power supply must be performed in combi-

nation with the DC/DC power module to

demonstrate that the output meets the require-

ment for SELV. The input pins of the module are

not operator accessible.

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 pin and ground.

Output Characteristics

Minimum Load Requirement

There is no minimum load requirement for the

AV45C quarter-brick series modules.

Remote Sensing

The AV45C quarter-brick series can remotely

sense both lines of its output which moves the

effective output voltage regulation point from

the output terminals of the unit to the point of

connection of the remote sense pins. This fea-

ture automatically adjusts the real output volt-

age of the AV45C series in order to compen-

sate for voltage drops in distribution and main-

tain a regulated voltage at the point of load.

When the converter is supporting loads far

away, or is used with undersized cabling, sig-

nificant voltage drop can occur at the load. The

best defense against such drops is to locate the

load close to the converter and to ensure ade-

quately sized cabling is used. When this is not

possible, the converter can compensate for a

drop of up to 10%Vo, through use of the sense

leads.

When used, the + and - Sense leads should be

connected from the converter to the point of

load as shown in Figure 9 using twisted pair

wire. The converter will then regulate its output

voltage at the point where the leads are con-

nected. Care should be taken not to reverse the

sense leads. If reversed, the converter will trig-

ger OVP protection and turn off. When not

used, the +Sense lead must be connected with

+Vo, and -Sense with -Vo. Also note that the

output voltage and the remote sense voltage

offset must be less than the minimum overvolt-

age trip point.

Note that at elevated output voltages the maxi-

mum power rating of the module remains the

same, and the output current capability will

decrease correspondingly.

+Vout

-Vout

Load

+Sense

-Sense

Twisted Pair

-S

Fig.9 Sense Connections

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