2. No load set point is 5 mV higher than the nominal voltage, to partially compensate voltage drop on the output pins.
3. Load regulation is affected with resistance of the output pins (approximately 0.3 mΩ) since there is no remote sense.
4. Cross regulation is affected with resistance of the RETURN pin (approximately 0.3 mΩ) since there is no remote sense.
MCD10092 Rev. 3.0, 9-Oct-08
Page 3 of 15
www.power-one.com
QD48T012018 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2 and 1.8 VDC @ 15A Output
Physical Information
Pin Connections
1
2
3
7
TOP VIEW
6
5
4
Pin #
1
2
3
4
5
6
7
•
•
•
•
•
Function
Vin (+)
ON/OFF
Vin (-)
Vout1 (+)
RTN [Vout1(-) and Vout2(-)]
TRIM
Vout2 (+)
SIDE VIEW
All dimensions are in inches [mm]
All pins are Ø 0.040” [1.02] with Ø 0.078”
[1.98] shoulder
Pin Material: Brass
Pin Finish: Tin/Lead over Nickel
Converter Weight: 1 oz [28 g] typical
HT
(Maximum Height)
Height
Option
A
B
C
D
+0.000 [+0.00]
-0.038 [- 0.97]
0.303 [7.69]
0.336 [8.53]
0.500 [12.70]
0.400 [10.16]
CL
(Minimum Clearance)
+0.016 [+0.41]
-0.000 [- 0.00]
0.030 [0.77]
0.063 [1.60]
0.227 [5.77]
0.127 [3.23]
Pin
Option
A
B
C
PL
Pin Length
±0.005
[±0.13]
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
Converter Part Numbering Scheme
Product
Series
Input
Voltage
Mounting
Scheme
Output
Voltage 1
(V
OUT
1 )
Output
Voltage 2
(V
OUT
2)
ON/OFF
Logic
Maximum
Height
[HT]
Pin
Length
[PL]
Special
Features
QD
Dual
Quarter-
Brick
Format
48
T
012
012
⇒
1.2 V
018
018
⇒
1.8 V
-
N
N
⇒
Negative
P
⇒
Positive
B
A
⇒
0.303”
B
⇒
0.336”
C
⇒
0.500”
D
⇒
0.400”
A
0
36-75 V
Through-
hole
Note: Always specify V
OUT
2 as the
higher of the two output voltages.
A
⇒
0.188”
B
⇒
0.145”
C
⇒
0.110”
0
⇒
STD
The example above describes P/N QD48T012018-NBA0: 36-75 V input, dual output, through-hole mounting, 1.2 V and 1.8 V outputs @ 15 A each, negative
ON/OFF logic, a maximum height of 0.336”, and a through the board pin length of 0.188”. Please consult factory regarding availability of a specific version.
RoHS Ordering Information:
•
•
No RoHS suffix character is required for lead-solder-exemption compliance.
For RoHS compliance to all six substances, add the letter "G" as the last letter of the part number.
MCD10092 Rev. 3.0, 9-Oct-08
Page 4 of 15
www.power-one.com
QD48T012018 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2 and 1.8 VDC @ 15A Output
Operation
Input and Output Impedance
These power converters have been designed to be stable
with no external capacitors when used in low inductance in-
put 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 addi-
tion 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 capaci-
tance at the load. The converter will exhibit stable operation
with external load capacitance up to 10,000 µF on both out-
puts.
may be connected directly to the ON/OFF input, in which
case it should be capable of sourcing or sinking up to 1 mA
depending on the signal polarity. See the Start-up Informa-
tion section for system timing waveforms associated with
use of the ON/OFF pin.
Output Voltage Adjust /TRIM (Pin 6)
The converter’s output voltages can be adjusted simultane-
ously up 10% or down 10% relative to the rated output volt-
ages by the addition of an externally connected resistor.
The TRIM pin should be left open if trimming is not being
used. To minimize noise pickup, a 0.1 µF capacitor is con-
nected internally between the TRIM and RETURN pins.
Family
Converter
TM
Vin (+)
Q
Vout2 (+)
TRIM
RTN
Rload1
R
T-INCR
Rload2
ON/OFF (Pin 2)
The ON/OFF pin is used to turn the power converter on or
off remotely via a system signal. There are two remote con-
trol options available, positive logic and negative logic and
both are referenced to Vin(-). Typical connections are shown
in Fig. 2.
Vin (+)
(Top View)
Vin
ON/OFF
Vin (-)
Vout1 (+)
Fig. 3:
Configuration for increasing output voltage.
Q
TM
Family
Converter
(Top View)
Vout2 (+)
TRIM
RTN
Rload1
Rload2
To increase the output voltage (refer to Fig. 3), a trim resis-
tor, R
T-INCR
, should be connected between the TRIM (Pin 6)
and RETURN (Pin 5), with a value from the table below.
Vin
ON/OFF
Vin (-)
CONTROL
INPUT
Vout1 (+)
Vin (+)
Family
Converter
TM
Q
Vout2 (+)
TRIM
RTN
Rload1
Rload2
R
T-DECR
(Top View)
Vin
ON/OFF
Fig. 2:
Circuit configuration for ON/OFF function.
Vin (-)
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 volt-
age of
≤
0.8 V. An external voltage source of
±20
V max.
MCD10092 Rev. 3.0, 9-Oct-08
Vout1 (+)
Fig. 4:
Configuration for decreasing output voltage.
To decrease the output voltage, a trim resistor R
T-DECR
, (Fig.
4) should be connected between the TRIM (Pin 6) and
Vout2(+) pin (Pin 7), with a value from the table below,
where:
Δ
= percentage of increase or decrease Vout(NOM).
Note 1: Both outputs are trimmed up or down simultane-
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