H48SC3R325 Datasheet, PDF (8/12 Pages) Delta Electronics, Inc. – Industry standard pin out

FEATURES DESCRIPTIONS
Over-Current Protection
The module provides two over current protection levels.
When the output current exceeds the low current limit
level, the module will endure current limiting till the
output voltage is lower than 0.2V. If the output current
exceeds the high current limit level, the module will shut
down immediately.
The modules will try to restart after shutdown (hiccup
mode). If the overload condition still exists, the module
will shut down again. This restart trial will continue until
the load 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.
The modules will try to restart after shutdown (hiccup
mode). If the over voltage still exists, the module will
shut down again. This restart trial will continue until the
voltage condition is corrected
Over-Temperature Protection
The over-temperature protection consists of circuitry
that provides protection from thermal damage. If the
temperature exceeds the over-temperature threshold
the module will shut down.
The module will try to restart after shutdown. If the
over-temperature condition still exists during restart, the
module will not start up. This restart trial will continue
until the temperature is within specification.
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 logic low and off during logic high.
Positive logic turns the modules on during logic high and
off during 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 to floating.
H48SC3R325_07122011
Vi(+) Vo(+)
Sense(+)
ON/OFF
Sense(-)
Vi(-) _Vo(-)
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).
Vi(+) Vo(+)
Sense(+)
Contact
Resistance
Sense(-)
Vi(-) Vo(-)
Contact and Distribution
Losses
Figure 17: Effective circuit configuration for remote sense
operation
If the remote sense feature is not used to regulate the
output at the point of load, please connect SENSE(+) to
Vo(+) and SENSE(–) to Vo(–) at the module.
The output voltage can be increased by both the
remote sense and the trim; however, the maximum
increase is the larger of either the remote sense or the
trim, not the sum of both.
When using remote sense and trim, the output voltage
of the module is usually increased, which increases the
power output of the module with the same output
current.
Care should be taken to ensure that the maximum
output power does not exceed the maximum rated
power.
8