V48SC datasheet(8/17 Pages) DELTA

8 / 17 page

DS_V48SC12007_04262016



The input source must be insulated from the ac mains

by reinforced or double insulation.



The input terminals of the module are not operator

accessible.



A SELV reliability test is conducted on the system

where the module is used, in combination with the

module, to ensure that under a single fault, hazardous

voltage does not appear at the m

odule’s output.

When installed into a Class II equipment (without

grounding), spacing consideration should be given to the

end-use installation, as the spacing between the module

and mounting surface have not been evaluated.

The power module has extra-low voltage (ELV) outputs

when all inputs are ELV.

This power module is not internally fused. To achieve

optimum safety and system protection, an input line fuse

is highly recommended. The safety agencies require a

Fast-acting fuse with 20A maximum rating to be installed

in the ungrounded lead. A lower rated fuse can be used

based on the maximum inrush transient energy and

maximum input current.

Soldering and Cleaning Considerations

Post solder cleaning is usually the final board assembly

process before the board or system undergoes electrical

testing. Inadequate cleaning and/or drying may lower the

reliability of a power module and severely affect the

finished circuit board assembly test. Adequate cleaning

and/or drying is especially important for un-encapsulated

and/or open frame type power modules. For assistance on

appropriate soldering and cleaning procedures, please

contact Delta’s technical support team.

Over-Current Protection

The modules include an internal output over-current

protection circuit, which will endure current limiting for an

unlimited duration during output overload. If the output

current exceeds the OCP set point, the modules will

automatically shut down, and enter hiccup mode or latch

mode, which is optional, the default is hiccup mode.

For hiccup mode, the module will try to restart after

shutdown. If the over current condition still exists, the

module will shut down again. This restart trial will continue

until the over-current condition is corrected.

Over-Voltage Protection

The modules include an internal output over-voltage

protection circuit, which monitors the voltage on the

output terminals. If this voltage exceeds the over-voltage

set point, the module will shut down, and enter in hiccup

mode or latch mode, which is optional, the default is

hiccup mode.

For hiccup mode, the module will try to restart after

shutdown. If the over voltage condition still exists, the

module will shut down again. This restart trial will

continue until the over-voltage condition is corrected.

For latch mode, the module will latch off once it

shutdown. The latch is reset by either cycling the input

power or by toggling the on/off signal for one second.

Over-Temperature Protection

The over-temperature protection consists of circuitry that

provides

protection

from

thermal

damage.

the

temperature exceeds the over-temperature threshold the

module will shut down, and enter in auto-restart mode or

latch mode, which is optional, the default is auto-restart

mode.

For auto-restart mode, the module will monitor the

module

temperature

after

shutdown.

Once

the

temperature is dropped and within the specification, the

module will be auto-restart.

Remote On/Off

The remote on/off feature on the module can be either

negative or positive logic. Negative logic turns the

module on during a logic low and off during a logic high.

Positive logic turns the modules on during a logic high

and off during a logic low.

Remote on/off can be controlled by an external switch

between the on/off terminal and the Vi(-) terminal. The

switch can be an open collector or open drain.

For negative logic if the remote on/off feature is not used,

please short the on/off pin to Vi(-). For positive logic if the

remote on/off feature is not used, please leave the on/off

pin floating.

Vo(+)

Vi(+)

Vo(-)

Sense(-)

Sense(+)

Vi(-)

ON/OFF

Figure 16: Remote on/off implementation

Remote Sense

Remote sense compensates for voltage drops on the

output by sensing the actual output voltage at the point

of load. The voltage between the remote sense pins and

the output terminals must not exceed the output voltage

sense range given here:

[Vo(+)

– Vo(–)] – [SENSE(+) – SENSE(–)] ≤ 10% × Vout

This limit includes any increase in voltage due to remote

sense compensation and output voltage set point

adjustment (trim).

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