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QBC-12 Datasheet, PDF (1/5 Pages) Murata Power Solutions Inc. – 48VIN, 12V/22A Output High Efficiency, ¼-Brick Bus Converters
QBC Series
48VIN, 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 ~
Model
VOUT IOUT ‚
V
A
QBC-12/22-L48-C 12 22
Output
R/N (mV p-p) 
Typ.
Max.
80
120
Regulation €
Line Load Temp.
Max. Max. Max.
±10% ±5% ±2%
Input
VIN
Nom. Range
V
V
48 40.5-57
Iin 
mA/A
125/5.7
Efficiency
Min.
Typ.
94.5% 96%
Package/Pinout
C49, C50/P65
~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.
‚IOUT max. at low line is 24 Amps; 20 Amps at high line. (See Performance Curves.)
Ḥ
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
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