RBQ-12/33-D48xB-C
www.murata-ps.com
Quarter-Brick 400-Watt Isolated DC-DC Converters
Output (Vout, typ)
Current (A)
Nominal Input (V)
11.7
33
48
Typical unit
FEATURES
PRODUCT OVERVIEW
386 Watts total output power, 11.7 VDC @ 33 A
The fully isolated (2250 Vdc) RBQ-12/33-D48xB-C
module accepts a 36 to 75 Volt DC input voltage
range (48 VDC nominal) and converts it to a low Vdc
output. Applications include 48V-powered datacom
and telecom installations, base stations, cellular
dataphone repeaters, instruments and embedded
systems. Wideband output ripple and noise is a low
100 mV, peak-to-peak.
Regulated Intermediated Bus Architecture (RIBA)
with PoL converters
96% ultra-high efficiency at full load (typical)
36 to 75 Volt DC input range (48 VDC nominal)
Standard quarter-brick footprint
Synchronous rectifier topology with 100 mV
ripple & noise
Up to +85° Celsius thermal performance (with
derating)
Stable no-load operation
Multiple-unit parallel operation for increased
current
Fully isolated to 2250 VDC (BASIC)
The RBQ’s synchronous-rectifier topology with
line regulation and fixed frequency operation
means excellent efficiencies up to 96%, enabling
“no heatsink” operation for most applications up
to +85° Celsius (with derating airflow). “No fan” or
zero airflow higher temperature applications may
use the optional base plate for cold surface mounting or natural-convection heatsinks.
A wealth of electronic protection features include
input undervoltage lockout (UVLO) , output current
limit, short circuit hiccup, and overtemperature
shutdown. Available options include positive or
negative logic remote On/Off control, conformal
coating, and various pin lengths. Assembled using
ISO-certified automated surface-mount techniques,
the RBQ series is certified to all UL and IEC emissions, safety and flammability standards.
Remote On/Off enable control
Extensive protection features – SC, OC, UVLO, OT
Certified to full safety, emissions and environmental standards
Approved to UL 60950-1, CAN/CSAC22.2 No.
60950-1, IEC60950-1, EN60950-1 safety approvals (2nd Edition, with Amendment 1)
F1
Isolation
Barrier
+Vin (1)
+Vout (8)
• Switching
External
DC
Power
Source
On/Off
Control
(2)
Open = On
Closed = Off
(Positive
logic)
• Filters
Controller
and Power
Transfer
Duty Cycle
Regulation
• Current Sense
Reference and
Error Amplifier
-Vin (3)
-Vout (4)
Figure 1. Connection Diagram
Typical topology is shown. Murata Power Solutions
recommends an external fuse at F1.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_RBQ-12/33-D48.C01∆ Page 1 of 15
RBQ-12/33-D48xB-C
Quarter-Brick 400-Watt Isolated DC-DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Root Model ➀
RBQ-12/33-D48xB-C
Total
Vout
IOUT
Power
(V, typ) (A, typ) (W, typ)
11.7
33
386
Input
Ripple & Noise
(mVp-p)
Typ.
Max.
100
200
Regulation (max.) ➁ VIN Nom. Range
Line (%) Load (%)
(V)
(V)
+1/-2
➀ Please refer to the part number structure for additional options and complete ordering part
numbers.
➁ Regulation specifications describe the output voltage deviations as the line voltage or load
current is varied from its nominal/midpoint value to either extreme. (Load step = ±25 %). Line
Regulation tested from 40V to 75V, output @nominal load.
±3
48
36-75
IIN, min. IIN, full
load
load
(mA)
(A)
140
8.59
Efficiency
Dimensions
(inches)
(mm)
Typ.
96%
2.3 x 1.45 x 0.5 58.4 x 36.8 x 12.7
➂ All specifications are at nominal line voltage and full load, +25 deg.C. unless otherwise noted.
See detailed specifications. Output capacitors are 1μF, 10uF and 470μF in parallel, with a 220μF
input capacitor. I/O caps are necessary for our test equipment and may not be needed for your
application.
PART NUMBER STRUCTURE
RB Q - 12 / 33 - D48 N B S H Lx - C
RoHS Hazardous Materials compliance
C = RoHS 6 (does not claim EU RoHS exemption 7b–lead in solder), standard
Output Configuration
RB = Regulated Converter
Pin Length Option (Through-hole packages only)
Quarter-Brick Package
Isolated converter
Blank = Standard pin length 0.180 inches (4.6mm)
L1 = Pin length 0.110 inches (2.79mm) ➀
L2 = Pin length 0.145 inches (3.68mm) ➀
Maximum Output Voltage (11.85V)
Conformal coating (optional)
Blank = no coating, standard
H = Coating added, optional ➀
Maximum Rated Output
Current in Amps
Input Voltage Range
D48 = 36-75V,
48V nominal
Load Share Option
Blank = no share
S = Load share
Baseplate
B = Baseplate installed, standard
NOTE: This product is not available without the baseplate.
On/Off Control Logic Option
N = Negative logic
P = Positive logic
➀ Special quantity order is required; samples available with standard pin length only.
➁ Some model number combinations may not be available. See website or contact your local Murata sales representative.
www.murata-ps.com/support
MDC_RBQ-12/33-D48.C01∆ Page 2 of 15
RBQ-12/33-D48xB-C
Quarter-Brick 400-Watt Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
On/Off Remote Control
Output Power
Conditions ➀
Minimum
Full power operation
Operating or non-operating, 100 mS max.
duration
Input to output, 100 mS to IEC/EN/UL 60950-1
Power on or off, referred to -Vin
0
Typical/Nominal
Maximum
Units
80
Vdc
0
100
Vdc
0
0
2250
15
391
Vdc
Vdc
W
Current-limited, no damage, short-circuit
0
33
A
protected
Storage Temperature Range
Vin = Zero (no power)
-55
125
°C
Absolute maximums are stress ratings. Exposure of devices to greater than 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 or recommended.
Output Current
INPUT
Operating voltage range
Recommended External Fuse
Start-up threshold
Undervoltage shutdown
Internal Filter Type
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load Input Current (Iout @ min)
Shut-Down Mode Input Current
Reflected (back) ripple current ➁
36
Fast blow
Rising input voltage
Falling input voltage
32
30
Vin = minimum
Iout = minimum, unit=ON
48
20
33.5
31.5
Pi
75
35
33
Vdc
A
Vdc
Vdc
8.59
10.8
8.68
12
0.3
0.5
200
10
200
A
A
A2-Sec.
A
mA
mA
mA, RMS
140
5
70
Measured at input with specified filter
GENERAL and SAFETY
Efficiency
Vin=48V, full load
Vin=75V, full load
Isolation
Isolation Voltage, input to output
Isolation Voltage, input to baseplate
Isolation Voltage, output to baseplate
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
95
93
96
94
%
%
2250
1500
1500
Vdc
Vdc
Vdc
basic
10
1500
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd Edition with Amendment 1
Per Telcordia SR332, issue 1, class 3, ground
fixed, Tambient=+25°C
Mohm
pF
Yes
1.8
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Delay
Startup Delay
Dynamic Load Response
Dynamic Load Peak Deviation
360
KHz
Power On to Vout regulated, 10-90% Vout,
resistive load
Remote ON to 10% of Vout
50-75-50% load step, settling time to within
±2% of Vout
Same as above
20
mS
10
mS
350
µSec
±400
mV
1
0.8
15
2
V
V
mA
1
15
1
2
V
V
mA
Typical/Nominal
Maximum
Units
FEATURES and OPTIONS
Remote On/Off Control ➃
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
OUTPUT
ON = Pin grounded or external voltage
OFF = Pin open or external voltage
Open collector/drain
-0.1
2.5
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Open collector/drain
3.5
0
Conditions ➀
Minimum
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MDC_RBQ-12/33-D48.C01∆ Page 3 of 15
RBQ-12/33-D48xB-C
Quarter-Brick 400-Watt Isolated DC-DC Converters
FUNCTIONAL SPECIFICATIONS (CONT.)
Total Output Power
Voltage
Nominal Output Voltage
Nominal Output Voltage
Total Output Range
Vout Overshoot
Voltage
Output Voltage
(initial output set point @48V, no load)
Output Voltage
(initial output set point @48V, 50% load)
Output Voltage
(initial output set point @48V, 100% load)
Output Voltage
Overvoltage Protection
Current
Output Current Range
Minimum Load
Current Limit Inception
Short Circuit
Short Circuit Current
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation ➄
Line Regulation
Load Regulation
Ripple and Noise
Temperature Coefficient
Maximum Capacitive Loading
(10% ceramic, 90% Oscon)
See Derating
0
386
391
W
Measured @ 48Vin, Full Load.
Measured @ 48Vin, Half Load.
Over sample load (0-33A), input line (40-75V)
and temperature (see derating curves) , for
regular model and S option
11.4
11.55
11.7
11.7
12.5
11.85
Vdc
Vdc
11
12.5
V
12.9
13.1
V
For S option only
11.7
12.5
Vdc
For S option only
11.685
11.715
Vdc
For S option only
11.5
11.7
Vdc
11.0
12.5
Vdc
For S option only: total output range (input line,
load, temperature, samples)
Output Voltage clamped (see technical note)
N/A
0
98% of Vnom., after warmup
40
V
33
No minimum load
46
Hiccup technique, autorecovery within 1.25%
of Vout
Output shorted to ground, no damage
33
A
50
A
6
A
+1/-2
±3
200
0.02
%
%
mV pk-pk
% of Vnom./°C
6000
μF
Continuous
Current limiting
Vin=40 to 75V
Iout=min. to max., Vin=48V
5 Hz- 20 MHz BW
At all outputs
Cap. ESR=