QD48T025033-NBB0 POWER ONE, QD48T025033-NBB0 Datasheet - Page 5

• Manufacturer Part Number: QD48T025033-NBB0
• Description: CONV DC-DC 48V IN 3.3/2.5V DUAL
• Manufacturer: POWER ONE
• Series: QD48r
• Type: Isolatedr

Specifications of QD48T025033-NBB0

• Output: 2.5V, 3.3V
• Number Of Outputs: 2
• Power (watts): 49W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 7-DIP Module, 1/4 Brick
• 1st Output: 2.5 VDC @ 15A
• 2nd Output: 3.3 VDC @ 15A
• Size / Dimension: 2.30" L x 1.45" W x 0.34" H (58.4mm x 36.8mm x 8.6mm)
• Power (watts) - Rated: 49.5W
• Operating Temperature: -40°C ~ 85°C
• Efficiency: 88%
• Approvals: cUL, UL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 4th Output: -
• Other names: 179-2235; QD48T025033-NAA0; QD48T025033-NBBO

Operation
Input and Output Impedance
These power converters have been designed to be stable
with no external capacitors when used in low inductance
input and output circuits.
However, in many applications, the inductance associated
with the distribution from the power source to the input of the
converter can affect the stability of the converter. The
addition of a 33 µF electrolytic capacitor with an ESR < 1 Ω
across the input helps ensure stability of the converter. In
many applications, the user has to use decoupling
capacitance at the load. The converter will exhibit stable
operation with external load capacitance up to 10,000 µF on
both outputs.
ON/OFF (Pin 2)
The ON/OFF pin is used to turn the power converter on or
off remotely via a system signal.
control options available, positive logic and negative logic
and both are referenced to Vin(-). Typical connections are
shown in Fig. 2.
The positive logic version turns on when the ON/OFF pin is
at logic high and turns off when at logic low. The converter is
on when the ON/OFF pin is left open
The negative logic version turns on when the pin is at logic
low and turns off when the pin is at logic high. The ON/OFF
pin can be hard wired directly to Vin(-) to enable automatic
power up of the converter without the need of an external
control signal.
ON/OFF pin is internally pulled-up to 5 V through a resistor.
A mechanical switch, open collector transistor, or FET can
be used to drive the input of the ON/OFF pin. The device
must be capable of sinking up to 0.2 mA at a low level
voltage of ≤ 0.8 V. An external voltage source of ±20 V max.
may be connected directly to the ON/OFF input, in which
case it should be capable of sourcing or sinking up to 1 mA
MCD10084 Rev. 1.0, 25-Sep-08
Vin
CONTROL
Fig. 2: Circuit configuration for ON/OFF function.
INPUT
ON/OFF
Vin (+)
Vin (-)
Q
Converter
(Top View)
TM
Family
.
There are two remote
Vout2 (+)
Vout1 (+)
TRIM
RTN
36-75 VDC Input; 2.5 and 3.3VDC @ 15A Outputs
Rload2
Rload1
Page 5 of 15
QD48T025033 DC-DC Converter Data Sheet
depending on the signal polarity. See the Start-up
Information section for system timing waveforms associated
with use of the ON/OFF pin.
Output Voltage Adjust /TRIM (Pin 6)
The
simultaneously up 10% or down 10% relative to the rated
output voltages by the addition of an externally connected
resistor. For output voltage 3.3 V, trim up to 10% is
guaranteed only at Vin ≥ 40 V, and it is marginal (8% to
10%) at Vin = 36 V.
The TRIM pin should be left open if trimming is not being
used. To minimize noise pickup, a 0.1 µF capacitor is
connected internally between the TRIM and RETURN pins.
To increase the output voltage (refer to Fig. 3), a trim
resistor, R
(Pin 6) and RETURN (Pin 5), with a value from the table
below.
To decrease the output voltage, a trim resistor R
4) should be connected between the TRIM (Pin 6) and
Vout1(+) pin (Pin 4), with a value from the table below,
where:
Δ = percentage of increase or decrease Vout(NOM).
Note
simultaneously.
Vin
Vin
converter’s
1:
Fig. 4: Configuration for decreasing output voltage.
Fig. 3: Configuration for increasing output voltage.
T-INCR
Both
, should be connected between the TRIM
ON/OFF
Vin (+)
ON/OFF
Vin (-)
Vin (+)
Vin (-)
outputs
output
(Top View)
(Top View)
Converter
Q
Q
Converter
TM
TM
Family
Family
are
voltages
trimmed
Vout2 (+)
Vout2 (+)
Vout1 (+)
Vout1 (+)
www.power-one.com
TRIM
TRIM
can
RTN
RTN
up
be
R
R
T-DECR
T-INCR
T-DECR
or
adjusted
Rload2
Rload1
Rload2
Rload1
, (Fig.
down