RBE-12/20-D48 Series
www.murata-ps.com
Eighth-Brick 240-Watt Isolated DC/DC Converters
Typical unit
FEATURES
PRODUCT OVERVIEW
240 Watts total output power, fixed12 VDC @ 20 A
The fully isolated (2250 Vdc) RBE-12/20-D48
series accept a 36 to 75 Volt DC input voltage
range (48 VDC nominal) and converts it to a fixed
12Vdc 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 (typical), peak-to-peak.
Reduced open frame overall height of 0.4˝ (10.2
mm) fits tight card cages.
94.5% ultra-high efficiency at full load with
regulation
36 to 75 Volt DC input range (48 VDC nominal)
Standard eighth-brick footprint
0.4-inch (10.2 mm) low height (no baseplate)
Synchronous rectifier topology with 100 mV
(typ.) ripple & noise
Up to +85° Celsius thermal performance (with
derating)
Stable no-load operation
Fully isolated to 2250 VDC (BASIC)
The RBE’s regulated synchronous-rectifier
topology and fixed frequency operation means
excellent efficiencies up to 94.5%, enabling “no
heatsink” operation for most applications up to
+85° Celsius (see derating curves). “No fan” or
zero airflow higher temperature applications may
use the optional base plate for cold plate mounting
or natural-convection heatsinks.
Electronic protection features include input
undervoltage lockout (UVLO) , output current limit,
short circuit hiccup, and overtemperature shutdown. Available options include positive or negative
logic On/Off control, conformal coating, various
pin lengths, and the baseplate. Assembled using
ISO-certified automated surface-mount techniques,
the RBE series is certified to UL and IEC safety
standards.
Remote On/Off enable control
Extensive protection features – SC, OC, UVLO, OT
Certified to safety, emissions and environmental
standards
Meets UL 60950-1, CAN/CSAC22.2 No. 60950-1,
IEC60950-1, EN60950-1 safety approvals
(2nd Edition)
F1
*TPMBUJPO
Barrier
+Vin (1)
+Vout (8)
t4XJUDIJOH
External
DC
Power
Source
On/Off
Control
(2)
Open = On
$MPTFE 0GG
1PTJUJWF
MPHJD
t'JMUFST
Controller
and Power
5SBOTGFS
Duty Cycle
3FHVMBUJPO
t$VSSFOU4FOTF
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
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MDC_RBE-12-20-D48.B08 Page 1 of 16
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Root Model ➀
VOUT
(V)
RBE-12/20-D48
11.7
Total
IOUT
Power
(A, max) (W)
20
Input
Ripple & Noise
IIN, min. IIN, full
(mVp-p)
Regulation (max.) ➁ VIN Nom. Range load
load
Typ.
Line (%) Load (%)
(V)
(V)
(mA)
(A)
234
100
±2
±3
48
36-75
80
5.16
Efficiency
Min. Typ.
91%
Package
Case (inches)
Case (mm)
94.5%
2.3x0.9x0.4
58.4x22.9x10.16
Please refer to the part number structure for additional options and complete ordering part numbers.
➁ Line regulation is given as Vin = 40V to 75V, Iout = half load. Load regulation is Vin = 48V, Iout = Imin to Imax.
➂ All specifications are at the full input voltage range, maximum load, and full temperature range unless otherwise noted. See detailed specifications. Output capacitors are 1 μF in parallel with 10 μF and
470μF capacitor across the input pins. I/O caps are necessary for our test equipment and may not be needed for your application.
To Be Discontinued *
NOTE: All of the Positive enable models are To Be Discontinued.
RBE-12/20-D48PB-C, RBE-12/20-D48PBH-C, RBE-12/20-D48P-C and RBE-12/20-D48PH-C.
PART NUMBER STRUCTURE
R BE - 12 / 20 - D48 N M B H
RoHS Hazardous Substance Compliance
(does not claim EU RoHS exemption 7b–lead in solder)
C = RoHS-6
Output Configuration:
R = Regulated
Pin Length Option (Through-hole packages only)
Eighth-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
Nominal Output Voltage
Maximum Rated Output
Current in Amps
Input Voltage Range
D48 = 36-75V,
48V nominal
On/Off Control Logic
N = Negative logic
To Be Discontinued * P = Positive logic
➀
➁
➂
➃
Lx - C
Conformal coating (optional)
Blank = no coating, standard
H = Coating added, optional ➀
Baseplate
Blank = No baseplate
B = Baseplate installed ➁
Surface Mount
Blank = Thru-hole pin mount
M = Surface mount (MSL rating 1) ➂
Special quantity order is required; samples available with standard pin length only.
SMT (M) models are not available with a baseplate.
SMT (M) versions are not available in sample quantities.
Some model number combinations may not be available. See website or contact your local Murata sales representative.
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MDC_RBE-12-20-D48.B08 Page 2 of 16
* Last Time Buy date is 3/31/2019. Please click here to view the Discontinuance Notification.
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS
Conditions ➀
Minimum
Full power operation, full temperature range
Operating or non-operating, tested:
100 mS max. duration
Input to output
None, install external fuse
Power on or off, referred to -Vin
0
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
Typical/Nominal
0
Maximum
Units
80
Vdc
100
Vdc
2250
Vdc
Vdc
Vdc
W
None
0
0
15
237.51
Current-limited, no damage,
0
20
A
short-circuit protected
Operating Ambient Temperature Range
With derating
-40
85
°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 nor recommended.
Output Current
Conditions ➀ ➂
INPUT
Operating voltage range
Voltage Transient (100ms duration)
Recommended External Fuse
Start-up threshold
Undervoltage lockout
Reverse Polarity Protection
Internal Filter Type
Input current
Full Load Conditions
Low Line
Inrush Transient
Short circuit Input current
No Load Input Current
Shut-Down Mode Input Current (Off, UV, OT)
Reflected (back) ripple current ➁
Pre-biased startup
36
Fast blow
Rising input voltage
Falling input voltage
None, install external fuse
32
30
48
15
33
31
None
Pi
5.16
6.99
Vin = minimum
Vin = 48V
Measured at input with specified filter
External voltage < Vset
0
150
80
5
70
Monotonic
Vin = 48V
Vin = 75V
91
90
94.5
93
Input to output, continuous
Input to output, continuous
2250
2250
Iout = minimum, unit = ON, Vin = 48V
75
100
34
32
5.44
7.33
0.05
800
150
10
200
Vdc
Vdc
A
Vdc
Vdc
Vdc
A
A
A2-Sec.
mA
mA
mA
mA, pk-pk
V
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage – no baseplate
Isolation Voltage – with baseplate
Isolation Voltage, Input to baseplate
Isolation Voltage, Output to baseplate
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
%
%
Vdc
Vdc
Vdc
Vdc
1500
1500
basic
10
1500
Certified to UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd Edition
Per Telcordia SR332, issue 2, Method 1, Class 1,
GF Tambient = +25C
Mohm
pF
Yes
Hours x 106
2.1
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Delay
Rise time
Dynamic Load Response
Dynamic Load Peak Deviation
200
Power ON 10% Vout to 90% Vout
(50% resistive load)
Remote ON to 10% Vout, Vin = 48V
(50% resistive load)
50-75-50% load step,
settling time to within ±1% of Vout.
(48Vin, 470uF output capacitance, 1A/uS)
same as above
KHz
15
mS
15
mS
2000
μSec
±600
mV
1
0.8
15
2
V
V
mA
1
15
1
2
V
V
mA
FEATURES and OPTIONS
Remote On/Off Control ➅
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
Base Plate
ON = Ground pin or external voltage
OFF = Pin open or external voltage
Sinking
-0.1
2.5
ON = Pin open or external voltage
OFF = Ground pin or external voltage
Sinking
“B” suffix
3.5
0
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MDC_RBE-12-20-D48.B08 Page 3 of 16
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
FUNCTIONAL SPECIFICATIONS, CONTINUED
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Total Output Voltage Range
See Derating
0.0
234
237.51
W
Vin = 48V, half load. ±1.5 accuracy
Over sample load (0-20A) and temperature
(see derating curves)
11.525
11.7
11.876
Vdc
10.5
12
12.5
Vdc
13.4
Vdc
Vdc
Vout Overshoot
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
13
Output voltage clamped
13.5
0
20
No minimum load
28
20
A
38
A
Hiccup technique, autorecovery within ±1.25%
of Vout
4
10
A
Output shorted to ground, no damage
Continuous
±2
±3
150
%
%
mV pk-pk
% of Vnom./°C
μF
90% of Vnom., after warmup
24
Current limiting
Vin = 40 to 75V., Vout = nom., 50% load
Iout = 0 to 100%, Vin = 48V.
5 Hz- 20 MHz BW
At all outputs
Cap. ESR, Full resistive load
100
±0.02
470
Outline Dimensions (no baseplate)
Outline Dimensions (with baseplate)
4700
Conditions ➀ ➂
MECHANICAL (Through Hole Models)
2.3x0.9x0.4 max.
58.42x22.86x10.16
2.3x0.9x0.5
58.42x22.86x12.7
1.06
30
1.46
41.5
0.040±0.001
1.016±0.025
0.062±0.001
1.575±0.025
Copper alloy
50
5
Aluminum
LxWxH (Please refer to outline drawing)
Weight (no baseplate)
Weight (with baseplate)
Through Hole Pin Diameter
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Input pins (see drawings)
Output pins (see drawings)
Nickel subplate
Gold overplate
Baseplate Material
Inches
mm
Inches
mm
Ounces
Grams
Ounces
Grams
Inches
mm
Inches
mm
μ-inches
μ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
RoHS rating ➃
Notes
With derating, no condensation
No derating required
Vin = Zero (no power)
-40
-40
-55
115
125
85
120
125
130
°C
°C
°C
°C
External filter required
B
Class
External filter required
B
RoHS-6
Class
➀ Unless otherwise noted, all specifications apply over the full input voltage range, full temperature
range, nominal output voltage and full output load.
General conditions are near sea level altitude and natural convection airflow unless noted.
All models are tested and specified with external parallel 1 μF and 10 μF output capacitors. A 470
μF input capacitor is used across the input pins.
All capacitors are low-ESR types mounted 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 = 33 μF and Lbus = 12 μH.
➂ All models are stable and regulate to specification under no load.
➃ Reduction of Hazardous Substances (RoHS) compliance is to RoHS-6 (six substances restricted
including lead).
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.
➅ The Remote On/Off Control is referred to -Vin.
➆ Please refer to the Part Number Structure for complete ordering model numbers.
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MDC_RBE-12-20-D48.B08 Page 4 of 16
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA
Maximum Current Temperature Derating at sea level in Transverse Direction
Vin= 36V (air flow direction is from Vin- to Vin+), no baseplate
Maximum Current Temperature Derating at sea level in Longitudinal Direction
Vin= 36V (air flow direction is from Vin to Vout), no baseplate
24
24
22
22
20
20
18
16
Output Current (Amps)
Output Current (Amps)
18
2.0 m/s (400LFM)
1.5 m/s (300LFM)
14
1.0 m/s (200LFM)
0.5 m/s (100LFM)
12
10
8
6
16
14
1.0 m/s (200LFM)
0.5 m/s (100LFM)
10
8
6
4
4
2
2
0
2.0 m/s (400LFM)
1.5 m/s (300LFM)
12
0
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
Ambient Temperature (ºC)
22
20
20
18
18
16
Output Current (Amps)
Output Current (Amps)
24
22
2.0 m/s (400LFM)
1.5 m/s (300LFM)
1.0 m/s (200LFM)
0.5 m/s (100LFM)
10
8
6
65
70
75
80
85
16
2.0 m/s (400LFM)
1.5 m/s (300LFM)
14
12
1.0 m/s (200LFM)
0.5 m/s (100LFM)
10
8
6
4
4
2
2
0
0
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
Ambient Temperature (ºC)
24
22
22
20
20
18
18
Output Current (Amps)
16
2.0 m/s (400LFM)
1.5 m/s (300LFM)
12
1.0 m/s (200LFM)
0.5 m/s (100LFM)
10
55
60
65
70
75
80
85
Maximum Current Temperature Derating at sea level in Longitudinal Direction
Vin= 75V (air flow direction is from Vin to Vout), no baseplate
24
14
50
Ambient Temperature (ºC)
Maximum Current Temperature Derating at sea level in Transverse Direction
Vin= 75V (air flow direction is from Vin- to Vin+), no baseplate
Output Current (Amps)
60
Maximum Current Temperature Derating at sea level in Longitudinal Direction
Vin= 48V (air flow direction is from Vin to Vout), no baseplate
24
12
55
Ambient Temperature (ºC)
Maximum Current Temperature Derating at sea level in Transverse Direction
Vin= 48V (air flow direction is from Vin- to Vin+), no baseplate
14
50
8
6
16
14
10
1.0 m/s (200LFM)
0.5 m/s (100LFM)
8
6
4
4
2
2
0
2.0 m/s (400LFM)
1.5 m/s (300LFM)
12
0
30
35
40
45
50
55
60
65
Ambient Temperature (ºC)
70
75
80
85
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
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MDC_RBE-12-20-D48.B08 Page 5 of 16
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA
Maximum Current Temperature Derating at sea level in Transverse Direction
Vin= 36V (air flow direction is from Vin- to Vin+), with baseplate
Maximum Current Temperature Derating at sea level in Longitudinal Direction
Vin= 36V (air flow direction is from Vin to Vout), with baseplate
24
24
22
22
20
20
18
16
Output Current (Amps)
Output Current (Amps)
18
2.0 m/s (400LFM)
1.5 m/s (300LFM)
14
1.0 m/s (200LFM)
0.5 m/s (100LFM)
12
10
8
6
16
1.0 m/s (200LFM)
0.5 m/s (100LFM)
12
10
8
6
4
4
2
2
0
2.0 m/s (400LFM)
1.5 m/s (300LFM)
14
0
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
Ambient Temperature (ºC)
60
65
70
75
80
85
Maximum Current Temperature Derating at sea level in Longitudinal Direction
Vin= 48V (air flow direction is from Vin to Vout), with baseplate
24
24
22
22
20
20
18
18
2.0 m/s (400LFM)
1.5 m/s (300LFM)
16
14
Output Current (Amps)
Output Current (Amps)
55
Ambient Temperature (ºC)
Maximum Current Temperature Derating at sea level in Transverse Direction
Vin= 48V (air flow direction is from Vin- to Vin+), with baseplate
1.0 m/s (200LFM)
0.5 m/s (100LFM)
12
10
8
6
2.0 m/s (400LFM)
1.5 m/s (300LFM)
16
14
1.0 m/s (200LFM)
0.5 m/s (100LFM)
12
10
8
6
4
4
2
2
0
0
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
Ambient Temperature (ºC)
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
Maximum Current Temperature Derating at sea level in Transverse Direction
Vin= 75V (air flow direction is from Vin- to Vin+), with baseplate
Maximum Current Temperature Derating at sea level in Longitudinal Direction
Vin= 75V (air flow direction is from Vin to Vout), with baseplate
24
24
22
22
20
20
18
16
14
2.0 m/s (400LFM)
1.5 m/s (300LFM)
12
1.0 m/s (200LFM)
Output Current (Amps)
18
Output Current (Amps)
50
0.5 m/s (100LFM)
10
8
6
16
1.0 m/s (200LFM)
0.5 m/s (100LFM)
12
10
8
6
4
4
2
2
0
2.0 m/s (400LFM)
1.5 m/s (300LFM)
14
0
30
35
40
45
50
55
60
65
Ambient Temperature (ºC)
70
75
80
85
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (ºC)
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MDC_RBE-12-20-D48.B08 Page 6 of 16
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA
On/Off Enable start up (Vin=48V, Iout=20A, Cload=470uf, Ta=+25°C)
Ch2=Vout, Ch4=Enable
On/Off Enable start up (Vin=48V, Iout=0A, Cload=470uf, Ta=+25°C)
Ch2=Vout, Ch4=Enable
On/Off Enable start up (Vin=48V, Iout=20A, Cload=4700uf, Ta=+25°C)
Ch2=Vout, Ch4=Enable
Start up Delay (Vin=48V, Iout=20A, Cload=470uf, Ta=+25°C) Ch1=Vin, Ch2=Vout
Start up Delay (Vin=48V, Iout=0A, Cload=470uf, Ta=+25°C) Ch1=Vin, Ch2=Vout
Start up Delay (Vin=48V, Iout=20A, Cload=4700uf, Ta=+25°C) Ch1=Vin, Ch2=Vout
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MDC_RBE-12-20-D48.B08 Page 7 of 16
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA
Efficiency vs. Line Voltage and Load Current @ 25°C
Thermal image with hot spot at full load current with 30°C ambient; air is flowing at 100
LFM. Air is flowing across the converter from -Vin to +Vin at 48V input.
Identifiable and recommended maximum value to be verified in application.
100
Efficiency (%)
95
VIN = 36V
VIN = 48V
VIN = 75V
90
85
80
75
70
0
5
10
15
20
25
Load C urre nt (Amps)
Typical Output Voltage (Vout) Vs. Output load at +25°C
Typical Output Voltage (Vout) vs. Input Voltage (Vin) at +25°C
12.2
12
12
10A
20A
no load
11.6
11.4
11.8
11.6
Output Voltage/Vout
Output Voltage/Vout
11.8
11.2
11
11.4
11.2
36V
48V
75V
11
10.8
10.8
10.6
10.6
Input Voltage/Vin
The RBE-12/20-D48 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.
10.4
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
Load/A
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MDC_RBE-12-20-D48.B08 Page 8 of 16
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
TYPICAL PERFORMANCE DATA
Typical Startup Waveform with a 4V bias voltage
Typical Startup Waveform with a 8V bias voltage
Output Ripple and Noise (Vin = 48V, Iout = 20A, Cload = 1uF || 10μF, Ta = +25°C)
Output Ripple and Noise (Vin = 48V, Iout = 0A, Cload = 1uF || 10μF, Ta = +25°C)
Output Ripple and Noise (Vin = 48V, Iout = 20A, Cload = 4700μF, Ta = +25°C)
Stepload Transient Response (Vin = 48V, Cload = 470μF, Iout = 50-75-50% of Imax,
1A/μS, Ta = +25°C)
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MDC_RBE-12-20-D48.B08 Page 9 of 16
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
MECHANICAL SPECIFICATIONS (THROUGH-HOLE MOUNT)
SIDE VIEW
PINS 1-3,:
φ0.040±0.0015(1.016±0.038)
PINS 4,5:
φ0.062±0.0015(1.575±0.038)
L
50.80
2.000
SEE NOTE 6
50.80
2.000
1
4
15.24
0.600
15.24
0.600
22.86
0.900
2
SEE NOTE 6
3
4
15.24
0.600
15.24
0.600
3
0.005 minimum clearance
between standoffs and
highest component
2
1
8
22.86
0.900
0.005 minimum clearance
between standoffs and
highest component
L
PINS 1-3,:
φ0.040±0.0015(1.016±0.038)
PINS 4,5:
φ0.062±0.0015(1.575±0.038)
10.16
0.40
OPEN FRAME
12.7
0.50
WITH BASEPLATE OPTION
8
58.4
2.30
58.4
2.30
BOTTOM PIN SIDE VIEW
BOTTOM PIN SIDE VIEW
RECOMMENDED FOOTPRINT
(VIEW THROUGH CONVERTER)
M3-6H TYP 2PL
FINISHED HOLE SIZES
PINS 1-3
TOP VIEW
2.32
(PER IPC-D-275, LEVEL C)
CL
0.048-0.062
(PRI)
(SEC)
1
8
0.46
0.92
NOTES:
UNLESS OTHERWISE SPECIFIED;
1:M3 SCREW USED TO BOLT UNIT’S BASEPLATE TO OTHER SURFACES(SUCH AS
HEATSINK)
MUST NOT EXCEED 0.120’’(3.0mm) DEPTH BELOW THE SURFACE OF BASEPLATE
2:APPLIED TORQUE PER SCREW SHOULD NOT EXCEED 5.3In-lb(0.6Nm);
3:ALL DIMENSION ARE IN INCHES[MILIMETER];
4:ALL TOLERANCES: ×.××in ,±0.02in(×.×mm,±0.5mm)
×.×××in ,±0.01in(×.××mm,±0.25mm)
5:COMPONENT WILL VARY BETWEEN MODELS
6:STANDARD PIN LENGTH: 0.180 Inch
7: FINISH: (ALL PINS) GOLD (5u”MIN) OVER NICKEL (50u” MIN)
FOR L2 PIN LENGTH OPTION IN MODEL NAME., USE STANDARD L2 PIN WITH PIN
LENGTH TO 0.145 Inch
CL
TOP VIEW
2
CL
3
0.100 MIN
@ 1-3
FOR PIN
SHOULDERS
4
1.00
FINISHED HOLE SIZES
@ PINS 4 & 8
2.000
(PER IPC-D-275, LEVEL C)
0.070-0.084
IT IS RECOMMENDED THAT NO PARTS
BE PLACED BENEATH CONVERTER
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Pin
1
2
3
INPUT/OUTPUT CONNECTIONS
Pin
-Vout
+Vin
4
Remote On/Off
8
+Vout
-Vin
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only
and may vary between units.
www.murata-ps.com/support
MDC_RBE-12-20-D48.B08 Page 10 of 16
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
MECHANICAL SPECIFICATIONS (SURFACE MOUNT, MSL RATING 1)
0.015 Min
[0.381]
[10.16]
0.40
NOTES:
UNLESS OTHERWISE SPECIFIED;
1:ALL DIMENSION ARE IN INCHES[MILIMETER];
2:ALL TOLERANCES: ×.××in ,±0.02in(×.×mm,±0.5mm)
×.×××in ,±0.01in(×.××mm,±0.25mm)
3:COMPONENT WILL VARY BETWEEN MODELS
[50.80]
2.000
0.06
[1.524]
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
4
Components are shown for reference only
and may vary between units.
[22.86]
0.900
3
2
8
1
Pin
1
2
3
[58.4]
2.30
PIN SIDE VIEW
3
FEED
DI R E ( U N W I
N
C
----- TION D)
INPUT/OUTPUT CONNECTIONS
Pin
+Vin
-Vout
4
Remote On/Off
8
+Vout
-Vin
PIN #1 INDICATOR
AT EACH POCKET
ON POCKET TAPE
PIN #1 OF
DC-DC
CONVERTER
2.300
2.83 58.42
72.00
FEED (UNWIND)
DIRECTION -------
'ROUND'
SPROCKET
HOLES
5
5
1.319
33.50
'OBLONG'
SPROCKET
HOLES
1
4
13.0" x 72mm WIDE
REEL (REF)
.450
11.43
.900
22.86
ĭ7.0(0.28")MIN AREA
PICK & PLACE LOCATION
1.260
32.00
NOTES: (UNLESS OTHERWISE SPECIFIED)
1.
2.
3.
4.
5.
REFER TO SPECIFIC BOM FOR LIST OF PARTS
NOTE ORIENTATION OF PARTS IN POCKETS
APPLY MARKING LABEL (ITEM 4) AS SH0WN
LEAVE THE FIRST SEVEN (7) POCKETS EMPTY, FILL THE NEXT 100
POCKETS WITH PRODUCT, AND LEAVE EIGHT (8) POCKETS MINIMUM
EMPTY ON THE END OF THE REEL.
PEEL FORCE OF THE COVER TAPE:
THE ANGLE BETWEEN THE COVER TAPE DURING PEEL-OFF AND THE
UNREELING DIRECTION SHALL BE 180 FOR A PEEL SPEED OF
39IN/MIN, THE PEEL FORCE SHALL BE 30-60 GRAMS, SEE MURATA-PS
PROCEDURE A-46002. THE COVER TAPE SHALL ADHERE UNIFORMLY
TO THE CARRIER (POCKET) TAPE.
www.murata-ps.com/support
MDC_RBE-12-20-D48.B08 Page 11 of 16
RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
TECHNICAL NOTES
Thermal Shutdown
Extended operation at excessive temperature will initiate overtemperature
shutdown triggered by a temperature sensor inside the PWM controller. This
operates similarly to overcurrent and short circuit mode. The inception point
of the overtemperature condition depends on the average power delivered,
the ambient temperature and the extent of forced cooling airflow. Thermal
shutdown uses only the hiccup mode (autorestart).
Start Up Considerations
When power is first applied to the DC/DC converter, there is some risk of start up
difficulties if you do not have both low AC and DC impedance and adequate regulation of the input source. Make sure that your source supply does not allow the
instantaneous input voltage to go below the minimum voltage at all times.
Use a moderate size capacitor very close to the input terminals. You may
need two or more parallel capacitors. A larger electrolytic or ceramic cap supplies the surge current and a smaller parallel low-ESR ceramic cap gives low
AC impedance.
Remember that the input current is carried both by the wiring and the
ground plane return. Make sure the ground plane uses adequate thickness
copper. Run additional bus wire if necessary.
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. For
greatest safety, we recommend a fast blow fuse installed in the ungrounded
input supply line.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the rising input voltage exceeds and remains at the Start-Up Threshold
Voltage (see Specifications). Once operating, converters will not turn off until
the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent
restart will not occur until the input voltage rises again above the Start-Up
Threshold. This built-in hysteresis prevents any unstable on/off operation at a
single input voltage.
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Time (see Specifications) is the time interval between the point when
the rising input voltage crosses the Start-Up Threshold and the fully loaded
output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it appears
at the converter.
These converters include a soft start circuit to moderate the duty cycle of its
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from On command to Vout (final ±5%)
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specified accuracy
band. The specification assumes that the output is fully loaded at maximum
rated current. Similar conditions apply to the On to Vout regulated specification
such as external load capacitance and soft start circuitry.
Recommended Input Filtering
The user must assure that the input source has low AC impedance to provide
dynamic stability and that the input supply has little or no inductive content,
including long distributed wiring to a remote power supply. The converter will
operate with no additional external capacitance if these conditions are met.
For best performance, we recommend installing a low-ESR capacitor immediately adjacent to the converter’s input terminals. The capacitor should be a
ceramic type such as the Murata GRM32 series or a polymer type. Make sure
that the input terminals do not go below the undervoltage shutdown voltage at
all times. More input bulk capacitance may be added in parallel if needed.
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no additional
external capacitor. However, the user may install more external output capacitance
to reduce the ripple even further or for improved dynamic response. Again, use
low-ESR ceramic (Murata GRM32 series) or polymer capacitors. Mount these
close to the converter. Measure the output ripple under your load conditions.
Use only as much capacitance as required to achieve your ripple and noise
objectives. Excessive capacitance can make step load recovery sluggish or
possibly introduce instability. Do not exceed the maximum rated output capacitance listed in the specifications.
Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. The Cbus and Lbus
components simulate a typical DC voltage bus.
TO
OSCILLOSCOPE
CURRENT
PROBE
+VIN
VIN
+
–
+
–
LBUS
CBUS
CIN
-VIN
CIN = 300μF, ESR < 700mΩ @ 100kHz
CBUS = TBDμF, ESR < 100mΩ @ 100kHz
LBUS =
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