QD48T033050 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3VDC @ 15A and 5.0VDC @ 10A Outputs
The
QD48T033050
dual output through-hole mounted
DC-DC converter offers unprecedented performance in a
quarter brick package by providing two independently regu-
lated high current outputs with total power of 100 W. This is
accomplished by the use of patent pending circuit and pack-
aging techniques to achieve ultra-high efficiency, excellent
thermal performance and a very low body profile.
In telecommunications applications the
QD48
converters
provide up to 15 A @ 3.3 V and 10 A @ 5 V simultaneously
– with thermal performance far exceeding existing dual quar-
ter bricks and comparable to dual half-bricks. Low body pro-
file and the preclusion of heatsinks minimize airflow shadow-
ing, thus enhancing cooling for downstream devices. The
use of 100% surface-mount technologies for assembly, cou-
pled with Power-One’s advanced electric and thermal cir-
cuitry and packaging, results in a product with extremely
high quality and reliability.
110
100
90
QD48T033050 Converter
Features
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•
•
•
•
•
•
•
•
•
•
•
•
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RoHS lead-free solder and lead-solder-exempted
products are available
Delivers simultaneously up to 15 A on 3.3 VDC and up
to 10 A on 5.0 VDC output
Can replace two single output quarter-bricks
Minimal cross-channel interference
High efficiency: 88% @ full load, 89% @ half load
Starts-up into pre-biased output
No minimum load required
No heat sink required
Low profile: 0.28” [7.2 mm]
Low weight: 1 oz [28 g] typical
Industry-standard footprint: 1.45” x 2.30”
Industry-standard pinout
Meets Basic Insulation Requirements of EN60950
Withstands 100 V input transient for 100ms
On-board LC input filter
Fixed-frequency operation
Fully protected
Output voltage trim range:
±10%
for both outputs
Trim resistor via industry-standard equations
High reliability: MTBF 2.6 million hours, calculated per
Telcordia TR-332, Method I Case 1
Positive or negative logic ON/OFF option
UL 60950 recognized in U.S. & Canada, and certified
per IEC/EN 60950
Meets conducted emissions requirements of FCC
Class B and EN55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
Total Output Power [W]
80
70
60
50
40
30
20
10
0
20
30
40
50
60
70
80
90
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
Ambient Temperature [°C]
Fig. 1:
Available output power vs. ambient air temperature and
airflow rates for QD48T033050 converter mounted vertically with air
flowing from pin 3 to pin 1, MOSFET temperature
≤
120°C, Vin =
48 V and balanced load on both outputs (Iout1 = 1.5·Iout2).
Applications
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Telecommunications
Data communications
Wireless
Servers
MCD10083 Rev. 1.0, 24-Sep-08
Page 1 of 16
www.power-one.com
QD48T033050 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3VDC @ 15A and 5.0VDC @ 10A Outputs
Electrical Specifications
Conditions: T
A
=25ºC, Airflow=300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Ambient Temperature
Storage Temperature
Continuous
NOTES
MIN
0
-40
-55
36
TYP
MAX
80
85
125
UNITS
VDC
°C
°C
VDC
VDC
VDC
V
μF
μF
ADC
ADC
ADC
ADC
A
A
Arms
Arms
VDC
nF
MΩ
kHz
%
%
V
V
°C
ms
ms
VDC
VDC
VDC
VDC
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
Turn-off Threshold
Transient Withstand (Susceptibility)
48
34
32
75
35
33
100
10,000
4,700
15
10
20
15
30
30
4
4
Non-latching
33
31
Transient duration: 100 ms
3.3 V
5.0 V
3.3 V
5.0 V
3.3 V
5.0 V
3.3 V
5.0 V
3.3 V
5.0 V
Plus full load (resistive)
Plus full load (resistive)
At nominal output voltage 3.3 V
At nominal output voltage 5.0 V
Non-latching
Non-latching
Non-latching. Short = 10 mΩ.
Non-latching. Short = 10 mΩ.
Non-latching
Non-latching
OUTPUT CHARACTERISTICS
External Load Capacitance:
Output Current Range:
Current Limit Inception:
Peak Short-Circuit Current:
RMS Short-Circuit Current:
0
0
17
11.5
18.5
13
20
15
ISOLATION CHARACTERISTICS
I/O Isolation
Isolation Capacitance
Isolation Resistance
2000
1.3
10
435
3.3 V See section: Output Voltage Adjust/TRIM
5.0 V Simultaneous with 3.3 V output
3.3 V Non-latching
5.0 V Non-latching
Non-latching
Applies to all protection features
5.0 V 3.3 V tracks 5.0 V
-10
-10
3.85
5.85
4.125
6.15
120
100
4
+10
+10
4.25
6.4
FEATURE CHARACTERISTICS
Switching Frequency
1
Output Voltage Trim Range
Output Over-Voltage Protection
Over-Temperature Shutdown (PCB)
Auto-Restart Period
Turn-On Time
ON/OFF Control (Positive Logic)
Converter Off
Converter On
ON/OFF Control (Negative Logic)
Converter Off
Converter On
-20
2.4
2.4
-20
0.8
20
20
0.8
Additional Notes:
1. Vout1 and Vout2 can be simultaneously increased or decreased up to 10% via the Trim function. When trimming up, in order not to exceed
the converter‘s maximum allowable output power capability equal to the product of the nominal output voltage and the allowable output current
for the given conditions, the designer must, if necessary, decrease the maximum current (originally obtained from the derating curves) by the
same percentage to ensure the converter’s actual output power remains at or below the maximum allowable output power.
MCD10083 Rev. 1.0, 24-Sep-08
Page 2 of 16
www.power-one.com
QD48T033050 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3VDC @ 15A and 5.0VDC @ 10A Outputs
Electrical Specifications (continued)
Conditions: T
A
=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 VDC, unless otherwise specified.
PARAMETER
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on both outputs)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
NOTES
3.3 VDC @ 15 ADC, 5.0 VDC @ 10 ADC,
Vin = 36 V
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
See Figure 37 - 25MHz bandwidth
120Hz
-40ºC to 85ºC
-40ºC to 85ºC
MIN
TYP
MAX
3.2
UNITS
ADC
mADC
mADC
mA
PK-PK
dB
2.6
72
6
TBD
3.267
4.950
3.300
5.000
±2
±2
-10
-6
-3
-5
3.333
5.050
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation: Over Line
Over Load
2
Cross Regulation
Output Voltage Range
3
Output Ripple and Noise - 25MHz BW
3.3 V
5.0 V
3.3 V
5.0 V
3.3 V
5.0 V
3.3 V
5.0 V
3.3 V
5.0 V
3.3 V
5.0 V
For Iout2 (5.0 V) change from 0 to 10 A
For Iout1 (3.3 V) change from 0 to 15 A
Over line, load and cross regulation
Over line, load and cross regulation
Full load + 1
μF
ceramic
Full load + 1
μF
ceramic
ΔIout
= 25% of IoutMax
Co = 10
μF
tant. + 1
μF
ceramic (Fig.24)
Co = 10
μF
tant. + 1
μF
ceramic (Fig.25)
3.234
4.9
20
25
3.366
5.100
30
35
VDC
VDC
mV
mV
mV
mV
mV
mV
VDC
VDC
mV
PK-PK
mV
PK-PK
DYNAMIC RESPONSE
Load Change: 50% to 75% to 50%
di/dt = 0.1 A/μS 3.3 V
5.0 V
Setting Time to 1%
3.3 V
5.0 V
di/dt = 5 A/μS 3.3 V
5.0 V
Setting Time to 1%
3.3 V
5.0 V
40
50
100
20
90
90
60
60
88
89
mV
mV
µs
µs
mV
mV
µs
µs
%
%
Co = 300
μF
tant. + 1
μF
ceramic (Fig.26)
Co = 300
μF
tant. + 1
μF
ceramic (Fig.27)
EFFICIENCY
3.3V 100% Load, 5.0V 100% Load
3.3V 50% Load, 5.0V 50% Load
Additional Notes:
2. Load regulation is affected with resistance of the output pins (approximately 0.3 mΩ) since there is no remote sense.
3. Cross regulation is affected with resistance of the RETURN pin (approximately 0.3 mΩ) since there is no remote sense.
MCD10083 Rev. 1.0, 24-Sep-08
Page 3 of 16
www.power-one.com
QD48T033050 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3VDC @ 15A and 5.0VDC @ 10A Outputs
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
033
033
⇒
3.3 V
050
050
⇒
5.0 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 QD48T033050-NBA0: 36-75 V input, dual output, through-hole mounting, 3.3 V @ 15 A and 5.0 V @ 10 A, 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.
MCD10083 Rev. 1.0, 24-Sep-08
Page 4 of 16
www.power-one.com
QD48T033050 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3VDC @ 15A and 5.0VDC @ 10A Outputs
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 3.3 V and
4,700uF on 5 V output.
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. 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 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.
Family
Converter
TM
Vin
ON/OFF
Vin (-)
CONTROL
INPUT
Vout1 (+)
Vin (+)
Q
Vout2 (+)
TRIM
RTN
Rload1
R
T-DECR
Rload2
(Top View)
Vin
ON/OFF
Fig. 2:
Circuit configuration for ON/OFF function.
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.
may be connected directly to the ON/OFF input, in which
MCD10083 Rev. 1.0, 24-Sep-08
Vin (-)
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
Vout1(+) pin (Pin 4), 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-
ously.
Page 5 of 16
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