Q48SD Datasheet, PDF (9/24 Pages) Delta Electronics, Inc. – Industry standard, DOSA compliant pin out

FEATURES DESCRIPTIONS
Over-Current Protection
The modules include an internal output over-current
protection circuit. If the output current exceeds the OCP
set point, the modules will shut down, and enter hiccup
mode or latch mode. For hiccup mode, the module 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. For latch mode, the module will shut down
and not attempt to restart. The latch is reset by either
cycling the input power or by toggling the primary on/off
signal for one second. The OCP threshold and
protection mode can be reconfigured by the PMBus
Interface; the default configuration is hiccup mode.
Over-Voltage Protection
The modules include an internal output over-voltage
protection circuit. If output voltage exceeds the
over-voltage set point, the module will shut down, and
enter in hiccup mode or latch mode. For hiccup mode,
the module will try to restart after shutdown. If the output
overvoltage 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 shut down and not attempt to restart. The
latch is reset by either cycling the input power or by
toggling the primary on/off signal for one second. The Vo
OVP threshold and protection mode can be reconfigured
by the PMBus Interface; The default configuration is
hiccup mode.
Over-Temperature Protection
The modules include an internal over-temperature
protection circuit. If the module temperature exceeds the
over-temperature threshold the module will shut down,
and enter in auto-recovery mode or latch mode. For
auto-recovery mode, the module will monitor the module
temperature after shutdown. Once the temperature is
dropped and within the specification, the module will be
auto-recovery. For latch mode, the module will shut
down and not attempt to restart. The latch is reset by
either cycling the input power or by toggling the primary
on/off signal for one second. The OTP threshold and
protection mode can be reconfigured by the PMBus
Interface; The default configuration is hiccup mode.
Primary Remote On/Off
The primary 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.
DS_Q48SD12025_05032012
The primary 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. If the remote on/off feature is not used, for negative
logic, please short the on/off pin to Vi(-); For positive logic,
please leave the on/off pin floating. The module will not
response to the remote on/off signal which is less than
120us. The primary remote on/off logic can be
reconfigured by the PMBus Interface.
Vi(+)
Vo(+)
ON/OFF
R
Load
Vi(-)
Vo(-)
Figure 17: Remote on/off implementation
Secondary Remote On/Off
Reference to the Vo(-) terminal, there is a C2 pin. The
default configuration is set to ignore this input. And such
pin can be reconfigured as secondary remote on/off pin
by the PMBus interface including 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. The secondary remote on/off can be controlled
by an external switch between the on/off terminal and
the Vo(-) terminal. The switch can be an open collector
or open drain.
Parallel and Active Current Sharing
The modules are capable of operating in parallel, and
realizing current sharing by active current sharing
method. The current sharing pin of parallel module are
connected together to create a current sharing bus; in
this case, so called “Max Current” current sharing bus
method is employed.
The module with the max output current will be the
master module automatically, and it’s output current
signal will be sent to the current sharing pin as the
current sharing bus signal. The rest module with the
lower output current will be the slave module, which will
adjust their output voltage in order to bring their output
current increasing to the required current by the current
sharing bus signal. The current sharing accuracy
equation is:
X% = | Io – ( Itotal / N ) | / Irated, Where,
Io is the output current of per module;
Itotal is the total load current;
N is parallel module numbers;
Irated is the rated full load current of per module.
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