QBC-12 Datasheet, PDF (3/5 Pages) Murata Power Solutions Inc. – 48VIN, 12V/22A Output High Efficiency, ¼-Brick Bus Converters

Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ~
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)
Input
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)
Output
VOUT Range:
(over line, load and temperature)
9.6 to 13.5V
Minimum Loading Per Spec
No load
Ripple/Noise (20MHz BW)
See Performance Spec
Line/Load Regulation
See Performance Spec
Efficiency
See Performance Spec
Isolation Voltage:
Input/Output
2250Vdc min. (BASIC)
Isolation Resistance
10MΩ
Isolation Capacitance
470pF
Current Limit Inception ‚
25-28 Amps @ 98% VOUT
Short Circuit Current
TBD
Overvoltage Protection
13.85V
Capacitive Loading (Resistive Load) 10000uF
Temperature Coefficient
±0.02% /°C
Dynamic Characteristics
Dynamic Load Response (50-75%
load step to within 1.5% of VOUT) ‚
100μsec
Start up time: ƒ
VIN to VOUT
On/Off to VOUT
30 msec
30 msec
Switching Frequency, Fixed
150kHz (± TBD)
Environmental
Calculated MTBF „
TBC million hours
Operating PCB Temperature …
without Derating
–40 to +100°C
Thermal Shutdown
+115 to +125°C
Storage Temperature
–55 to +125°C
Physical
Dimensions
See Mechanical Dimensions
Pin Material
underplate
Copper, solder coated over nickel
Weight
1.62 ounces (46 grams)
Primary to Secondary Insulation Level Basic
QBC Series
48VIN, 12V/22A Output High Efficiency, ¼-Brick Bus Converters
~ 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.
ƒ 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.
Absolute Maximum Ratings
Input Voltage:
Continuous or transient
Input Reverse-Polarity Protection
Output Current
circuit without damage.
Storage Temperature
Lead Temperature (soldering, 10 sec.)
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
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.
Typical Performance Curves
Output Voltage vs. Output Current
(Ratio = 4:1, Output Impedance = 20m7)
15
14
VIN = 56V
13
12
VIN = 48V
11
VIN = 40.5V
10
9
0 2 4 6 8 10 12 14 16 18 20 22 24
Output Current (Amps)
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