Q48SC12033 Datasheet, PDF (11/28 Pages) Delta Electronics, Inc. – 400W DC/DC Power Modules

For the negative logic, if the remote ON/OFF
(ENABLE) feature is not used, please maintain the
ENABLE pin to Vin(-).
Vin+
Vo+
ENABLE
R
load
Vin-
Vo-
Figure 16: Remote ON/OFF (ENABLE) implementation
Secondary Remote On/Off
Reference to the Vo(-) terminal, there is a C2 pin. The
default configuration is set to PGOOD function. 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.
MFR_C1_C2_ARA_CONFIG, MFR_ C2_LOGIC,
MFR_PGOOD_POLARITY are used to config C2 pin
function.
Remote Sense
Remote sense minimizes the effects of distribution
losses by regulating the voltage at the remote-sense
connections (See Figure 17). The SENSE(-) pin should
be always connected to VO(-) pin. The voltage between
the remote-sense pins and the output terminals must
not exceed the output voltage sense range given in the
Feature Specifications
[VO(+) – VO(–)] – SENSE(+) ≤0.5 V
The output voltage can also be increased by the trim,
the maximum increase for the output voltage is the
sum of both. The amount of power delivered by the
module is defined as the voltage at the output
terminals multiplied by the output current. When using
remote sense and trim, the output voltage of the
module can be increased, which at the same output
current, would increase the power output of the
module. Care should be taken to ensure that the
maximum output power of the module remains at or
below the maximum rated power (Maximum rated
power = Vo,set x Io,max)
Input source
Vin(+)
Vin(-)
Vout(+)
Sense(+)
Sense(-)
Vout(-)
Resistance of trace
Load
Resistance of trace
Figure 17: Circuit Configuration for remote sense.
Configurable Control Pins
The module contains one configurable control pins C2,
referenced to the module secondary SIG_GND. See
Mechanical Views for pin locations. The following table
list the default factory configurations for the functions
assigned to the pin.
Pin
Designation/Function
C2
Power Good^Note4
On/Off^Note5
Configuration
Factory Default
Optional Vias PMBUS
Note4: Power Good is a Full-drive output, pull up to 3.3V internally,
Note5: On/Off is an Open-drain input.
Output Voltage Adjustment (TRIM) ^note3
To increase or decrease the output voltage set point,
connect an external resistor between the TRIM pin
and either the Vo(+) or Vo(-). The TRIM pin should be
left open if this feature is not used.
Figure 18: Circuit configuration for trim-down (decrease
output voltage)
If the external resistor is connected between the
TRIM and Vo (-) pins, the output voltage set point
decreases (Fig. 18). The external resistor value
required to obtain a percentage of output voltage
change △% is defined as:
Rtrim
_
down

 511
 _

10.2^{}K
Ex. When Trim-down -10% (12V×0.9=10.8V)
Rtrim
_
down



511
10

10.2^{}K

40.9K
Datasheet
DS_Q48SC12033_04062017
E-mail: [e-mail]
http://www.deltaww.com/dcdc
P11