Data Sheet
April 2008
QW050B1 and QW075B1 Power Modules; dc-dc Converters:
36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W
Features
n
Small size: 36.8 mm x 57.9 mm x 12.7 mm
(1.45 in. x 2.28 in. x 0.50 in.)
High power density
High efficiency: 85% typical
Low output noise
Constant frequency
Industry-standard pinout
Metal baseplate
2:1 input voltage range
Overtemperature protection
Remote sense
Negative remote on/off
Adjustable output voltage
Overvoltage and overcurrent protection
Manufacturing facilities registered against the
ISO*9000
series standards
UL
†
1950 Recognized,
CSA
‡
C22.2 No. 950-95
Certified, and
VDE
§
0805 (EN60950, IEC950)
Licensed
CE mark meets 73/23/EEC and 93/68/EEC direc-
tives**
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The QW Series Power Modules use advanced, surface-mount
technology and deliver high-quality, efficient, and compact
dc-dc conversion.
Applications
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Distributed power architectures
Computer equipment
Communications equipment
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Options
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Heat sinks available for extended operation
Auto-restart after overcurrent shutdown
Case ground pin
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*
ISO
is a registered trademark of the International Organization
for Standardization.
†
UL
is a registered trademark of Underwriters Laboratories, Inc.
‡
CSA
is a registered trademark of Canadian Standards Associa-
tion.
§
VDE
is a trademark of Verband Deutscher Elektrotechniker e.V.
** This product is intended for integration into end-use equipment.
All the required procedures for CE marking of end-use equip-
ment should be followed. (The CE mark is placed on selected
products.)
Description
The QW050B1 and QW075B1 Power Modules are dc-dc converters that operate over an input voltage range of
36 Vdc to 75 Vdc and provide a precisely regulated dc output. The outputs are fully isolated from the inputs,
allowing versatile polarity configurations and grounding connections. The modules have maximum power rat-
ings from 50 W to 75 W at a typical full-load efficiency of 85%.
The sealed modules offer a metal baseplate for excellent thermal performance. Threaded-through holes are pro-
vided to allow easy mounting or addition of a heat sink for high-temperature applications. The standard feature set
includes remote sensing, output trim, and remote on/off for convenient flexibility in distributed power applications.
QW050B1 and QW075B1 Power Modules; dc-dc Converters:
36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W
Data Sheet
April 2008
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Parameter
Input Voltage:
Continuous
Transient (100 ms)
Operating Case Temperature
(See Thermal Considerations section.)
Storage Temperature
I/O Isolation Voltage (for 1 minute)
Symbol
V
I
V
I, trans
T
C
T
stg
—
Min
—
—
–40
–55
—
Max
75
100
100
125
1500
Unit
Vdc
V
°C
°C
Vdc
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Table 1. Input Specifications
Parameter
Operating Input Voltage
Maximum Input Current:
V
I
= 0 V to 75 V; I
O
= I
O, max
; see Figures 1—2:
QW050B1
QW075B1
V
I
= 36 V to 75 V; I
O
= I
O, max
:
QW050B1
QW075B1
Inrush Transient
Input Reflected-ripple Current, Peak-to-peak
(5 Hz to 20 MHz, 12 µH source impedance;
see Figure 12.)
Input Ripple Rejection (120 Hz)
Fusing Considerations
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone
operation to an integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fus-
ing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. The
safety agencies require a normal-blow fuse with a maximum rating of 10 A (see Safety Considerations section).
Based on the information provided in this data sheet on inrush energy and maximum dc input current, the same
type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data for further information.
Symbol
V
I
Min
36
Typ
48
Max
75
Unit
Vdc
I
I, max
I
I, max
I
I, max
I
I, max
i
2
t
I
I
—
—
—
—
—
—
—
—
—
—
—
10
2.9
4.0
2.2
3.1
1.5
—
A
A
A
A
A
2
s
mAp-p
—
—
60
—
dB
2
Lineage Power
Data Sheet
April 2008
QW050B1 and QW075B1 Power Modules; dc-dc Converters:
36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W
Electrical Specifications
(continued)
Table 2. Output Specifications
Parameter
Output Voltage Set Point
(V
I
= 48 V; I
O
= I
O, max
; T
C
= 25 °C)
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life. See
Figure 14.)
Output Regulation:
Line (V
I
= 36 V to 75 V)
Load (I
O
= I
O, min
to I
O, max
)
Temperature (T
C
= –40 °C to +100 °C)
Output Ripple and Noise Voltage
(See Figure 13.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
External Load Capacitance
Output Current
(At I
O
< I
O, min
, the modules may exceed output
ripple specifications.)
Output Current-limit Inception
(V
O
= 90% of V
O, nom
)
Efficiency (V
I
= 48 V; I
O
= I
O, max
; T
C
= 70 °C; see
Figure 14.)
Switching Frequency
Dynamic Response
(ΔI
O
/Δt = 1 A/10 µs, V
I
= 48 V, T
C
= 25 °C;
tested with a 330 µF aluminum and a 1.0 µF
ceramic capacitor across the load.):
Load Change from I
O
= 50% to 75% of I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% of peak deviation)
Load Change from I
O
= 50% to 25% of I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% of peak deviation)
Device
All
All
Symbol
V
O, set
V
O
Min
11.78
11.64
Typ
12.0
—
Max
12.22
12.36
Unit
Vdc
Vdc
All
All
All
—
—
—
—
—
—
0.01
0.05
50
0.2
0.4
150
%V
O
%V
O
mV
All
All
All
QW050B1
QW075B1
QW050B1
QW075B1
QW050B1
QW075B1
All
—
—
—
I
O
I
O
I
O, cli
I
O, cli
η
η
—
—
—
0
0.5
0.5
—
—
—
—
—
—
—
—
—
—
7.5
9.5
84
85
380
75
225
470*
4.2
6.3
9.5
†
13.5
†
—
—
—
mVrms
mVp-p
µF
A
A
A
A
%
%
kHz
All
All
All
All
—
—
—
—
—
—
—
—
2
300
2
300
—
—
—
—
%V
O, set
µs
%V
O, set
µs
* Consult your sales representative or the factory.
† These are manufacturing test limits. In some situations, results may differ.
Table 3. Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance
Min
—
10
Typ
2500
—
Max
—
—
Unit
pF
MΩ
Lineage Power
3
QW050B1 and QW075B1 Power Modules; dc-dc Converters:
36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W
Data Sheet
April 2008
General Specifications
Parameter
Calculated MTBF (I
O
= 80% of I
O, max
; T
C
= 40 °C)
Weight
—
Min
Typ
3,000,000
—
75 (2.7)
Max
Unit
hours
g (oz.)
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See the Feature Descriptions section for additional information.
Parameter
Remote On/Off Signal Interface
(V
I
= 0 V to 75 V; open collector or equivalent compatible;
signal referenced to V
I
(–) terminal):
Logic Low—Module On
Logic High—Module Off
Logic Low:
At I
on/off
= 1.0 mA
At V
on/off
= 0.0 V
Logic High:
At I
on/off
= 0.0 µA
Leakage Current
Turn-on Time (See Figure 11.)
(I
O
= 80% of I
O, max
; V
O
within ±1% of steady state)
Output Voltage Adjustment:
Output Voltage Remote-sense Range
Output Voltage Set-point Adjustment Range (trim)
Output Overvoltage Protection
Overtemperature Protection
* These are manufacturing test limits. In some situations, results may differ.
Symbol
Min
Typ
Max
Unit
V
on/off
I
on/off
V
on/off
I
on/off
—
0
—
—
—
—
—
—
—
—
20
0.7
1.0
15
50
35
V
mA
V
µA
ms
—
—
V
O, sd
T
C
—
60
13.7*
—
—
—
—
105
0.5
110
15.7*
—
V
%V
O, nom
V
°C
Solder, Cleaning, and Drying Considerations
Post solder cleaning is usually the final circuit-board assembly process prior to electrical testing. The result of inad-
equate circuit-board cleaning and drying can affect both the reliability of a power module and the testability of the
finished circuit-board assembly. For guidance on appropriate soldering, cleaning, and drying procedures, refer to
the
Board-Mounted Power Modules Soldering and Cleaning
Application Note (AP97-021EPS).
4
Lineage Power
Data Sheet
April 2008
QW050B1 and QW075B1 Power Modules; dc-dc Converters:
36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W
Characteristic Curves
The following figures provide typical characteristics for the power modules.
2.5
INPUT CURRENT, I
I
(A)
2.0
I
O
= 4.17 A
1.5
1.0
0.5
0
20
I
O
= 2.00 A
I
O
= 0.50 A
90
85
EFFICIENCY,
η
(%)
80
75
70
65
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
0.5
1-0092
25
30
35
40
45
50
55
60
65
70
75
60
1.1
1.7
2.3
2.9
3.5
4.1
OUTPUT CURRENT, I
O
(A)
8-3438 (F)
INPUT VOLTAGE, V
I
(V)
Figure 1. Typical QW050B1 Input Characteristics at
Room Temperature
Figure 3. Typical QW050B1 Efficiency vs. Output
Current at Room Temperature
3.5
INPUT CURRENT, I
I
(A)
3.0
2.5
2.0
1.5
1.0
0.5
0
20 25 30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE, V
I
(V)
8-3437 (F)
EFFICIENCY,
η
(%)
I
O
= 6.25 A
I
O
= 3.50 A
I
O
= 0.60 A
90
85
80
75
70
65
60
0.6
1.6
2.6
3.6
4.6
5.6
OUTPUT CURRENT, I
O
(A)
1-0093
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
Figure 2. Typical QW075B1 Input Characteristics at
Room Temperature
Figure 4. Typical QW075B1 Efficiency vs. Output
Current at Room Temperature
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