, 12V/22A Output High Efficiency, ¼-Brick Bus Converters
Typical unit
FEATURES
264 Watts total output power
96% Ultra-high effi ciency @ full load
48V Input (40.5 to 57V range)
12V/22A Output for Intermediate Bus
Architectures with POL converters
Input Over/Under Voltage Shutdown
Synchronous-rectifier topology
150kHz fi xed switching frequency
Output current sharing
Fully isolated, 2250V (BASIC)
Low 80mVp-p ripple/noise
Standard quarter-brick package
Stable no-load condition
Thermal shutdown
Fully I/O protected
IEC/EN/UL/cUL60950-1 certified
The QBC-12/22-L48 DC/DC converter is one of DATEL's new
generation, fully isolated, Intermediate Bus Converters, designed and
optimized for total on-board solutions in combination with our non-
isolated point of load converters of the HEN, LEN, LQN, LSM and LSN
series.
.
PRODUCT OVERVIEW
The QBC’s convert the standard 48V (40.5 to 57V
limited range) to a nonregulated 12V (9.6 to 13.5V
range) bus voltage with a total output power of 264
Watts. Taking full advantage of a synchronous-rectifi
er topology, the QBC-series achieve ultra-high effi
ciency of 96%, minimizing power losses and ena-
bling full-power operation to ambient temperatures
up to +70°C with minimal air flow. These high-
density, open-frame DC/DC converters are standard
quarter-brick packages with industry-standard
footprint and are only 0.42 inches (10.67mm) high,
or 0.54 inches (13.72mm) with optional heat sink.
Assembled using fully automated, SMT-on-pcb
techniques, QBC’s provide fixed frequency conver-
sion, output On/Off control with choice of positive
(standard) or negative (optional) logic, stable no-
load operation, current sharing capability, and low
output ripple/noise (80mVp-p).
The fully functional QBC bus converters feature full
I/O fault protection including input overvoltage and
undervoltage shutdown, output overvoltage, output
current limiting, with choice of "hiccup" (standard)
or "latching" (optional), short-circuit protection, and
thermal shutdown.
All models are IEC/EN/UL60950-1 certified and EMC
compliant. Safety, CB, HALT and EMC reports are
available upon request.
Refer to the DATEL application note, Bus Converters
Aim to Boost Efficiency In IBA-Based Power Designs.
ORDERING GUIDE SUMMARY
Output
Model
QBC-12/22-L48-C
Input
Regulation
Line
Load
Max.
Max.
±10%
±5%
V
OUT
V
12
I
OUT
A
22
R/N (mV p-p)
Typ.
80
V
IN
Temp.
Max.
±2%
Max.
120
Nom.
V
48
Range
V
40.5-57
Iin
mA/A
125/5.7
Efficiency
Min.
94.5%
Package/Pinout
C49, C50/P65
Typ.
96%
Typical at TA = +25°C under nominal line voltage and nominal-load conditions, unless noted.
Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth. All models are specified with an external 0.1μF multi-layer ceramic capacitor installed across their output pins.
Devices have no minimum-load requirements and will regulate under no-load conditions. Regulation specifications describe the output-voltage deviation as the line voltage or load is varied from its midpoint
value to either extreme.
Nominal line voltage, no-load/full-load conditions.
I
OUT
max. at low line is 24 Amps; 20 Amps at high line. (See Performance Curves.)
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_QBC.A02
Page 1 of 6
QBC Series
48V
IN
, 12V/22A Output High Efficiency, ¼-Brick Bus Converters
MECHANICAL SPECIFICATIONS
2.22 (56.4)
B
1.860 (47.2)
B
A
2.30 (58.4)
B
B
A
A
A
1.860 (47.2)
ALUMINUM BASE PLATE
ALUMINUM BASE PLATE
1.45
(36.8)
1.030
(26.2)
#M3 X 0.5-6H THD X 0.175 DP
1.45
(36.8)
1.030
(26.2)
#M3 X 0.5-6H THD X 0.175 DP
0.42
(10.7)
0.54
(13.7)
0.50
(12.7)
2.22 (56.4)
A
0.225
(5.7)
PLASTIC STANDOFFS
ARE RELIEVED 0.030 (0.76)
IN SOLDER JOINT AREA
0.25 (6.4)
0.13 (3.3) TYP.
0.150
(3.8)
PINS 1-3: 0.040 ±0.001 (1.016 ±0.025)
PINS 4-5: 0.062 ±0.001 (1.575 ±0.025)
COPPER SMT LEADS
COPLANAR TO 0.004
B
B
B
B
2.00 (50.8)
A
1
0.600
(15.2)
4
0.600
(15.2)
0.600
(15.2)
0.600
(15.2)
2
3
5
1.45
(36.8)
0.300
(7.6)
BOTTOM VIEW
0.300
(7.6)
QBC Surface-Mount Version
BOTTOM VIEW
DIMENSIONS ARE IN INCHES (MM)
Dimensions are in inches (mm shown for ref. only).
QBC Through-Hole Version
INPUT/OUTPUT CONNECTIONS
Pin
Function P65
1
2
3
4
5
-Input
Remote On/Off
+Input
-Output
+Output
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
PART NUMBER STRUCTURE
Q BC
-
12
/
22
-
L48 N L B M
-
C
Quarter-Brick Package
Bus Converter
Nominal Output Voltage:
12 Volts
Leave the option letters blank for
standard default configuration.
Maximum Rated Output:
Current in Amps
Input Voltage Range:
L48 = 40.5 to 57 Volts
(48V nominal)
RoHS-6 hazardous
substance compliant
Optional Surface-Mount Package
Optional Baseplate
Latching over-current protection (optional)
(hiccup standard)
Note:
Optional:
Some model number combinations may not be
On/Off Control
available. Contact Murata Power Solutions for
with negative polarity
ordering assistance.
(standard is positive polarity)
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
www.murata-ps.com
MDC_QBC.A02
Page 2 of 6
B
QBC Series
48V
IN
, 12V/22A Output High Efficiency, ¼-Brick Bus Converters
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions unless noted.
Input
Input Voltage Range
Overvoltage Shutdown
Start-Up Threshold
Undervoltage Shutdown
Input Current
Input Reflected Ripple Current
Internal Filter Type
Reverse Polarity Protection
On/Off Control
Positive Logic
Negative Logic ("N" Suffix)
40.5-57 Volts (48V nominal)
57.5-59.5 Volts (58V typical)
37-40 Volts (39.5V typical)
36-39.5 Volts (38.5V typical)
See Performance Spec
10mVp-p
Pi
None (see Absolute Max. Ratings)
On= open (internal pull-up)
Off= 0 to 0.8V (0.8mA max.)
On = pulled low to 0-0.8V (0.8mA max.)
Off = open (internal pull-up)
All models are tested and specified with no external output and no external input capacitors,
and 300 lfm air flow, unless otherwise noted. All models will effectively regulate under no-load
conditions (with perhaps a slight increase in output ripple/noise).
See Technical Notes/Performance Curves for additional explanations and details.
Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 33μF input
capacitor and a simulated source impedance of 220μF and 12μH. See I/O Filtering,
Input Ripple Current and Output Noise for details.
The On/Off Control is designed to be driven with open collector or by appropriate voltage levels
The Current-Limit-Inception point is the output current level at which the converter's power-
limiting circuitry drops the output voltage 3% from its initial value. See Output Current Limiting
and Short-Circuit Protection for more details.
For Start-Up-Time specifications, output settling time is defined as the output voltage having
reached ±1% of its final value and the load current having reached at least 80% of its
final value.
MTBF is calculated using TELCORDIA SR-332 Method 1 Case 3, ground fixed, +25°C ambient
air and full-load conditions. Contact DATEL for demonstrated life test data.
All models are fully operational and meet all published specifications, including "cold start,"
at –40°C.
Output
V
OUT
Range:
(over line, load and temperature)
Minimum Loading Per Spec
Ripple/Noise
(20MHz BW)
Line/Load Regulation
Efficiency
Isolation Voltage:
Input/Output
Isolation Resistance
Isolation Capacitance
Current Limit Inception
Short Circuit Current
Overvoltage Protection
Capacitive Loading
(Resistive Load)
Temperature Coefficient
Dynamic Load Response
(50-75%
load step to within 1.5% of V
OUT
)
Start up time:
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency, Fixed
Calculated MTBF
Operating PCB Temperature
without Derating
Thermal Shutdown
Storage Temperature
Dimensions
Pin Material
underplate
Weight
9.6 to 13.5V
No load
See Performance Spec
See Performance Spec
See Performance Spec
2250Vdc min. (BASIC)
10MΩ
470pF
25-28 Amps @ 98% V
OUT
TBD
13.85V
10000uF
±0.02% /°C
Output Current
Absolute Maximum Ratings
Input Voltage:
Continuous or transient
Input Reverse-Polarity Protection
60 Volts
None (Input current must be
<1.5A all the time)
Current limited. Devices can
withstand an indefinite output short
–55 to +125°C
+300°C
circuit without damage.
Storage Temperature
Lead Temperature
(soldering, 10 sec.)
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied.
Dynamic Characteristics
100μsec
30 msec
30 msec
150kHz (± TBD)
Typical Performance Curves
Output Voltage vs. Output Current
(Ratio = 4:1, Output Impedance = 20m )
15
14
Output Voltage (Volts)
Environmental
TBC million hours
–40 to +100°C
+115 to +125°C
–55 to +125°C
V
IN
= 56V
13
12
11
10
9
0
2
4
6
8
10
12
14
16
18
20
22
24
Physical
See Mechanical Dimensions
Copper, solder coated over nickel
1.62 ounces (46 grams)
V
IN
= 48V
V
IN
= 40.5V
Primary to Secondary Insulation Level
Basic
Output Current (Amps)
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_QBC.A02
Page 3 of 6
QBC Series
48V
IN
, 12V/22A Output High Efficiency, ¼-Brick Bus Converters
Typical Performance Curves
QBC-12/22-L48
Efficiency vs. Line Voltage and Load Current
98
QBC-12/22-L48 Maximum Output Current vs. Ambient Temperature
96
94
92
V
IN
= 42V
90
V
IN
= 48V
V
IN
= 53V
88
86
2
4
6
8
10
12
14
16
18
20
Ambient Temperature (
°
C)
Load Current (Amps)
QBC-12/22-L48 Maximum Output Current vs. Ambient Temperature
Output Current (Amps)
Efficiency (%)
QBC-12/22-L48 Maximum Output Current vs. Ambient Temperature
Output Current (Amps)
Ambient Temperature (
°
C)
Output Current (Amps)
Ambient Temperature (
°
C)
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_QBC.A02
Page 4 of 6
QBC Series
48V
IN
, 12V/22A Output High Efficiency, ¼-Brick Bus Converters
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