Q48SA54001NNFH Datasheet, PDF (8/13 Pages) Delta Electronics, Inc. – Delphi Series Q48SA, 80W Quarter Brick Family DC/DC Power Modules: 36~75V in, 54V/1.5A out

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. The default OVP operation is hiccup
mode. Under hiccup mode, the modules 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.
Also, an optional latch-off mode for OVP is available. 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.
Figure 16: Remote on/off implementation
Output Voltage Adjustment (TRIM)
To increase or decrease the output voltage set point,
the modules may be connected with an external
resistor between the TRIM pin and either Vout1 (+) or
Vout (-). The TRIM pin should be left open if this
feature is not used.
Figure 17: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and sense (-) pin, the output voltage set point increases
(Fig. 17). The external resistor vvalue required to obtain
output voltage change ∆U is defined as:
R_{tr imu p}

127.5
U

4.7(K)
Ex. When Trim-up 5%，∆U is 5%*Vnormal = 0.05*53.5 =
2.675
R_{tr imu p}

127.5
2.675

4.7

42.96K
DS_Q48SA54001_05172013
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