Data Sheet
April 21, 2006
QBW018A0B Series Power Modules, DC - DC Converters:
36 – 75Vdc Input; 12Vdc Output; 18A Output Current
RoHS Compliant
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
Compliant to ROHS EU Directive 2002/95/EC with
lead solder exemption (non-Z versions)
High power density: 155 W/in
3
High efficiency – 93% at 12V full load
Improved Thermal Performance:
12A at 70ºC at 2m/s (400LFM)
Delivers up to 18A output current
Low output ripple and noise
Industry standard Quarter brick:
57.9 mm x 36.8 mm x 10.6 mm
Applications
Distributed power architectures
Intermediate bus voltage applications
Telecommunications equipment
Servers and storage applications
Networking equipment
(2.28 in x 1.45 in x 0.42 in)
Cost efficient open frame design
Single optimal regulated output
2 : 1 input voltage range
Constant switching frequency
Positive Remote On/Off logic
Output over current/voltage protection
Overtemperature protection
Wide operating temperature range (-40°C to 85°C)
ISO** 9001 certified manufacturing facilities
UL*
60950-1 Recognised,
CSA
†
C22.2 No. 60950-
‡
3-01 Certified, and EN 60950-1 (VDE 0805): 2001-
12 Licensed (pending)
CE mark meets 73/23/EEC and 93/68/EEC
directives
§
(pending)
Options
Negative Remote On/Off logic
Active load sharing (Parallel Operation)
Baseplate option (-H)
Auto restart after fault shutdown
Case ground pin
Description
The QBW018A0B series of dc-dc converters are an expansion of a new generation of DC/DC power modules
designed to support 12Vdc intermediate bus applications where multiple low voltages are subsequently generated
using discrete/modular point of load (POL) converters. The QBW018A0B series provide up to 18A output current in
an industry standard quarter brick, which makes it an ideal choice for small space, high current and 12V
intermediate bus voltage applications. The converter incorporates synchronous rectification technology and
innovative packaging techniques to achieve ultra high efficiency reaching 93% at 12V full load. This leads to lower
power dissipation such that for many applications a heat sink is not required.
The QBW018A0B series power modules are isolated dc-dc converters that operate over an input voltage range from
36 to 75 Vdc and provide a single regulated output. The output is fully isolated from the input, allowing versatile
polarity configurations and grounding connections. Built-in filtering for both input and output minimizes the need for
external filtering.
*
UL
is a registered trademark of Underwriters Laboratories, Inc.
†
‡
CSA
is a registered trademark of Canadian Standards Association.
VDE
is a trademark of Verband Deutscher Elektrotechniker e.V.
** ISO is a registered trademark of the International Organization of Standards
Document No: DS04-010 ver. 1.4
PDF name: qbus_qbw018a0b_ds.pdf
Data Sheet
April 21, 2006
QBW018A0B Series Power Modules, DC - DC Converters:
36 – 75Vdc Input; 12Vdc Output; 18A Output Current
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are
absolute 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 the device reliability.
Parameter
Input Voltage*
Continuous
Non- operating continuous
Operating Ambient Temperature
(See Thermal Considerations section)
Storage Temperature
All
T
stg
-55
125
°C
Vdc
I/O Isolation Voltage
All
1500
⎯
⎯
* Input over voltage protection will shutdown the output voltage when the input voltage exceeds threshold level.
All
V
IN
V
IN
T
A
-0.3
-0.3
-40
75
80
85
Vdc
Vdc
°C
Device
Symbol
Min
Max
Unit
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Parameter
Operating Input Voltage
Maximum Input Current
(V
IN
=0V to 75V, I
O
=I
O, max
)
Inrush Transient
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 12μH source impedance; V
IN
=
48V, I
O
= I
Omax
; see Figure 9)
Input Ripple Rejection (120Hz)
All
All
All
It
2
Device
Symbol
V
IN
I
IN,max
Min
36
-
-
-
-
Typ
48
-
-
24
-50
Max
75
7
1
-
-
Unit
Vdc
Adc
As
mAp-p
dB
2
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to being
part of a complex power architecture. To preserve maximum flexibility, internal fusing is not included, however, to
achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a fast-
acting fuse with a maximum rating of 15 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 sheet for further information.
Data Sheet
April 21, 2006
QBW018A0B Series Power Modules, DC - DC Converters:
36 – 75Vdc Input; 12Vdc Output; 18A Output Current
Electrical Specifications
(continued)
Parameter
Output Voltage Set-point
(V
IN
=
IN, min
, I
O
=I
O, max
, T
A
=25°C)
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life)
Output Regulation
Line (V
IN
=V
IN, min
to V
IN, max
)
Load (I
O
=I
O, min
to I
O, max
)
Temperature (T
ref
=T
A, min
to T
A, max
)
Output Ripple and Noise on nominal output
(V
IN
=V
IN, nom
and I
O
=I
O, min
to I
O, max
)
RMS (5Hz to 20MHz bandwidth)
Peak-to-Peak (5Hz to 20MHz bandwidth)
External Capacitance
Output Current
Output Current Limit Inception
Efficiency
V
IN
= V
IN, nom
, T
A
=25°C
I
O
=I
O, max ,
V
O
= V
O,set
Switching Frequency
Dynamic Load Response
(ΔIo/Δt=1A/10μs; V
in
=V
in
,nom; T
A
=25°C;
Tested with a 10
μF
aluminum and a 1.0
μF
tantalum capacitor across the load.)
Load Change from Io= 50% to 75% of Io,max:
Peak Deviation
Settling Time (Vo<10% peak deviation)
Load Change from Io= 75% to 50% of Io,max:
Peak Deviation
Settling Time (Vo<10% peak deviation)
⎯
__
⎯
__
All
f
sw
⎯
300
⎯
kHz
All
η
__
93
⎯
%
All
All
All
All
All
C
O, max
I
o
I
O, lim
⎯
⎯
⎯
0
⎯
20
25
70
⎯
⎯
⎯
3,000
18
⎯
mV
rms
mV
pk-pk
μF
Adc
Adc
All
All
All
⎯
⎯
⎯
0.2
3
150
% V
O, set
% V
O, set
mV
All
V
O
11.4
⎯
12.6
% V
O, set
Device
All
Symbol
V
O, set
Min
Typ
12
Max
Unit
V
dc
12V
V
pk
t
s
4
300
%V
O, set
μs
V
pk
t
s
__
__
4
300
__
%V
O, set
μs
Tyco Electronics Power Systems
3
Data Sheet
April 21, 2006
QBW018A0B Series Power Modules, DC - DC Converters:
36 – 75Vdc Input; 12Vdc Output; 18A Output Current
Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance
Device
Symbol
C
iso
R
iso
Min
⎯
10
Typ
2000
⎯
Max
⎯
⎯
Unit
pF
MΩ
General Specifications
Parameter
Calculated MTBF (I
O
=80% of I
O, max
, T
A
=25°C,
airflow=1m/s(200LFM))
Weight
⎯
Min
Typ
3088170
44 (1.55)
⎯
Max
Unit
Hours
g (oz.)
4
Tyco Electronics Power Systems
Data Sheet
April 21, 2006
QBW018A0B Series Power Modules, DC - DC Converters:
36 – 75Vdc Input; 12Vdc Output; 18A Output Current
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Parameter
Remote On/Off Signal Interface
(V
IN
=V
IN, min
to V
IN, max
; open collector or equivalent,
Signal referenced to V
IN-
terminal)
Negative Logic: device code suffix “1”
Logic Low = module On, Logic High = module Off
Positive Logic: No device code suffix required
Logic Low = module Off, Logic High = module On
Logic Low Specification
Remote On/Off Current – Logic Low
On/Off Voltage:
Logic Low
Logic High – (Typ = Open Collector)
Logic High maximum allowable leakage current
Turn-On Delay and Rise Times
(I
O
=I
O, max ,
V
IN
= V
IN, nom,
T
A
= 25 C, )
All
T
delay
= Time until V
O
= 10% of V
O,set
from either
application of Vin with Remote On/Off set to On or
operation of Remote On/Off from Off to On with Vin
already applied for at least one second.
Output Voltage Rise time (time for Vo to rise from 10%
of V
o,set
to 90% of V
o, set
)
Turn-On Output Voltage Overshoot (above V
o, set
)
Output Overvoltage Protection (Clamp)
Overtemperature Protection
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold
Turn-off Threshold
All
All
⎯
32
35
34
36
⎯
V
V
T
delay with
Vin
o
Device
Symbol
Min
Typ
Max
Unit
All
All
All
All
I
on/off
V
on/off
V
on/off
I
on/off
⎯
0.0
⎯
⎯
⎯
⎯
__
⎯
1.2
1.2
5
50
mA
V
V
μA
16
msec
All
T
delay with
On/Off
1
msec
All
All
All
All
T
rise
―
1
200
msec
mV
15
⎯
V
°C
13
T
ref
⎯
⎯
125
Tyco Electronics Power Systems
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