d48s1238-2a Delta Electronics, Inc., d48s1238-2a Datasheet - Page 7

• Manufacturer Part Number: d48s1238-2a
• Description: Delphi Series D48s1238, 450w Quarter Brick Dc/dc Power Modules 48v In, 12v/38a Out
• Manufacturer: Delta Electronics, Inc.

DS_D48S1238-2_04142009
FEATURES DESCRIPTIONS
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 (hiccup mode).
The modules will try to restart after shutdown. If the
overload condition still exists, the module will shut down
again. This restart trial will continue until the overload
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 latch off. The
over-voltage 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. 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 shut down again. 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 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 to floating.
Power Good
The converter (C, D option code) provides an open
collector signal called Power Good (POK).
This output pin uses negative logic. It is set high when the
output is not within regulation of output voltage or Enable
is OFF. The power good signal is pulled low when output
is within regulation of output voltage.
Figure 11: Remote on/off implementation
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