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.
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 mount-
ing 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 emis-
sions, safety and flammability standards.
F1
+Vin (1)
Isolation
Barrier
• Switching
• Filters
Controller
and Power
Transfer
Duty Cycle
Regulation
• Current Sense
+Vout (8)
External
DC
Power
Source
On/Off
Control
(2)
Open = On
Closed = Off
(Positive
logic)
-Vin (3)
Reference and
Error Amplifier
-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
Total
V
out
I
OUT
Power
(V, typ) (A, typ) (W, typ)
11.7
33
386
Input
I
IN,
min. I
IN,
full
Regulation (max.)
➁
V
IN
Nom. Range load
load
Line (%) Load (%)
(V)
(V)
(mA)
(A)
+1/-2
±3
48
36-75
140
8.59
Root Model
➀
RBQ-12/33-D48xB-C
Ripple & Noise
(mVp-p)
Typ.
Max.
100
200
Effi-
ciency
Typ.
96%
Dimensions
(inches)
(mm)
2.3 x 1.45 x 0.5 58.4 x 36.8 x 12.7
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.
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
Output Configuration
RB
= Regulated Converter
Quarter-Brick Package
Isolated converter
RoHS Hazardous Materials compliance
C
= RoHS 6 (does not claim EU RoHS exemption 7b–lead in solder), standard
Pin Length Option
(Through-hole
packages only)
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
Conformal coating (optional)
Blank
= no coating, standard
H
= Coating added, optional
➀
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
Maximum Output Voltage (11.85V)
Maximum Rated Output
Current in Amps
Input Voltage Range
D48
= 36-75V,
48V nominal
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
Output Current
Conditions
➀
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
Minimum
0
0
0
0
Typical/Nominal
Maximum
80
100
2250
15
391
Units
Vdc
Vdc
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.
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
48
20
33.5
31.5
Pi
8.59
10.8
75
35
33
Vdc
A
Vdc
Vdc
Vin = minimum
Iout = minimum, unit=ON
Measured at input with specified filter
Vin=48V, full load
Vin=75V, full load
95
93
2250
1500
1500
140
5
70
96
94
8.68
12
0.3
0.5
200
10
200
A
A
A2-Sec.
A
mA
mA
mA, RMS
%
%
Vdc
Vdc
Vdc
GENERAL and SAFETY
Efficiency
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
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
basic
10
1500
Yes
1.8
360
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
10
350
±400
Mohm
pF
Hours x 10
6
KHz
mS
mS
µSec
mV
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Delay
Startup Delay
Dynamic Load Response
Dynamic Load Peak Deviation
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
ON = Pin grounded or external voltage
OFF = Pin open or external voltage
Open collector/drain
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Open collector/drain
-0.1
2.5
1
3.5
0
1
0.8
15
2
15
1
2
V
V
mA
V
V
mA
OUTPUT
Conditions
➀
Minimum
Typical/Nominal
Maximum
Units
www.murata-ps.com/support
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
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
0
11.4
11.55
11
12.9
For S option only
For S option only
For S option only
For S option only: total output range (input line,
load, temperature, samples)
Output Voltage clamped (see technical note)
11.7
11.685
11.5
11.0
N/A
0
98% of Vnom., after warmup
Hiccup technique, autorecovery within 1.25%
of Vout
Output shorted to ground, no damage
Current limiting
Vin=40 to 75V
Iout=min. to max., Vin=48V
5 Hz- 20 MHz BW
At all outputs
Cap. ESR=<0.02Ω, Full resistive load
470
2.3 x 1.45 x 0.5
58.4 x 36.8 x 12.7
2.4
69
0.04 ±0.001
1.016±0.025
0.060 ±0.001
1.524±0.025
Copper alloy
100-299
3.9-20
-40
-55
115
-40
125
110
B
10
-500
-152
RoHS-6
90
10,000
3048
85
125
130
120
+1/-2
±3
200
0.02
6000
%
%
mV pk-pk
% of Vnom./°C
μF
Inches
mm
Ounces
Grams
Inches
mm
Inches
mm
µ-inches
µ-inches
°C
°C
°C
°C
Class
%RH
feet
meters
Continuous
40
33
No minimum load
46
33
50
6
386
11.7
11.7
391
12.5
11.85
12.5
13.1
12.5
11.715
11.7
12.5
W
Vdc
Vdc
V
V
Vdc
Vdc
Vdc
Vdc
V
A
A
A
100
0.003
MECHANICAL (Through Hole Models)
Outline Dimensions
Weight
Through Hole Pin Diameter
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Input pins
Output pins
Nickel subplate
Gold overplate
With derating, full power, no condensation,
components +125˚C. max.
Vin = Zero (no power)
Measured at hotspot
Operating baseplate temperature
External filter is required
To +85°C
must derate -1%/1000 feet
ENVIRONMENTAL
Operating Ambient Temperature Range
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
RoHS rating
Notes
➀
Unless otherwise noted, all specifications are at nominal input voltage, nominal output voltage
and full load. General conditions are +25˚ Celsius ambient temperature, near sea level altitude,
natural convection airflow. All models are tested and specified with external parallel 1μF, 10μF
and 470 μF output capacitors and 220 µF external input capacitor. All capacitors are low-ESR
types wired close to the converter. These capacitors are necessary for our test equipment and
may not be needed in the user’s application.
➁
Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering
is Cbus = 220 µF, Cin = 220 µF and Lbus = 4.7 μH.
➂
All models are stable and regulate to specification under no load.
➃
The Remote On/Off Control is referred to -Vin.
➄
Regulation specifications describe the output voltage changes as the line voltage or load current
is varied from its nominal or midpoint value to either extreme.
www.murata-ps.com/support
MDC_RBQ-12/33-D48.C01∆
Page 4 of 15
RBQ-12/33-D48xB-C
Quarter-Brick 400-Watt Isolated DC-DC Converters
PERFORMANCE DATA
Efficiency and Power Dissipation
98
96
94
92
90
88
86
84
82
80
78
76
74
72
26
24
22
20
18
16
14
12
10
8
6
4
2
0
33
Typical Output Voltage (Vout) vs. Input Voltage (Vin) at +25°C
12
11.8
11.6
Loss
Efficiency (%)
V
IN
= 36V
V
IN
= 48V
V
IN
= 75V
Dissipation at 48V input
11.4
11.2
11
36
39
0% Load
50% Load
100% Load
3
6
9
12
15
18
21
Load Curre nt (Amps)
24
27
30
42
45
48
51
54
57
60
63
66
69
72
75
The RBQ-12/33-D48xB-C is not designed to be operated within the shaded area.
The output voltage will be fully regulated within the white area in the graph
above. Operation outside of this area is not recommended for normal use.
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