Datasheet

ManualsBrandsMURATA POWER SOLUTIONS ManualsPSU ComponentsDC/DC converter (print) 11.7 V 20 A 240 W No. of outputs: 1 x

RBE-12/20-D48 Series

Eighth-Brick 240-Watt Isolated DC/DC Converters

MDC_RBE-12-20-D48.B05Δ Page 1 of 16

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Figure 1. Connection Diagram

Typical topology is shown. Murata Power Solutions

recommends an external fuse at F1.

FEATURES



240 Watts total output power, ﬁ xed12 VDC @ 20 A



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 rectiﬁ er 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, no baseplate)



Remote On/Off enable control



Extensive protection features – SC, OC, UVLO, OT



Certiﬁ ed to safety, emissions and environmental

standards



Meets UL 60950-1, CAN/CSAC22.2 No. 60950-1,

IEC60950-1, EN60950-1 safety approvals

(2nd Edition)

PRODUCT OVERVIEW

The fully isolated (2250 Vdc, no baseplate) RBE-

12/20-D48 series accept a 36 to 75 Volt DC input

voltage range (48 VDC nominal) and converts it to a

ﬁ xed 12Vdc output. Applications include 48V-pow-

ered 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) ﬁ ts tight card cages.

The RBE’s regulated synchronous-rectiﬁ er

topology and ﬁ xed frequency operation means

excellent efﬁ ciencies up to 94.5%, enabling “no

heatsink” operation for most applications up to

+85° Celsius (see derating curves). “No fan” or

zero airﬂ ow 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 shut-

down. Available options include positive or negative

logic On/Off control, conformal coating, various

pin lengths, and the baseplate. Assembled using

ISO-certiﬁ ed automated surface-mount techniques,

the RBE series is certiﬁ ed to UL and IEC safety

standards.

Typical unit

External

Power

Source

Reference and

Error Ampliﬁer

t4XJUDIJOH

t'JMUFST

t$VSSFOU4FOTF

-Vout (4)

+Vout (8)

On/Off

Control

(2)

-Vin (3)

Open = On

$MPTFE0GG

+Vin (1)

1PTJUJWF

MPHJD

Controller

and Power

5SBOTGFS

Duty Cycle

3FHVMBUJPO

*TPMBUJPO

Barrier

Summary of content (16 pages)

PAGE 1
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, no baseplate) RBE12/20-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.
PAGE 2
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.
PAGE 3
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.
PAGE 4
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 20 No minimum load 28 20 A 38 A Hiccup technique, autorecovery within ±1.
PAGE 5
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.
PAGE 6
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 14 2.0 m/s (400LFM) 1.5 m/s (300LFM) 12 1.
PAGE 7
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 S
PAGE 8
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.
PAGE 9
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,
PAGE 10
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.
PAGE 11
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.
PAGE 12
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.
PAGE 13
RBE-12/20-D48 Series Eighth-Brick 240-Watt Isolated DC/DC Converters +VOUT C1 C2 SCOPE RLOAD -VOUT C1 = 1μF C2 = 10μF LOAD 2-3 INCHES (51-76mm) FROM MODULE Figure 3. Measuring Output Ripple and Noise (PARD) Thermal Shutdown To prevent many over temperature problems and damage, these converters include thermal shutdown circuitry.
PAGE 14
RBE-12/20-D48 Series Eighth-Brick 240-Watt Isolated DC/DC Converters Output OVP (Output Clamped) The RBE-12/20-D48 module incorporates circuitry to protect the output/load (Output OVP, Over Voltage Protection) by effectively clamping the output voltage to a maximum of 13.5V under certain fault conditions. The initial output voltage is set at the factory for an accuracy of ±1.5%, and is regulated over line load and temperature using a closed loop feedback system.
PAGE 15
RBE-12/20-D48 Series Eighth-Brick 240-Watt Isolated DC/DC Converters Emissions Performance Murata Power Solutions measures its products for radio frequency emissions against the EN 55022 and CISPR 22 standards. Passive resistance loads are employed and the output is set to the maximum voltage. If you set up your own emissions testing, make sure the output load is rated at continuous power while doing the tests.
PAGE 16
RBE-12/20-D48 Series Eighth-Brick 240-Watt Isolated DC/DC Converters Vertical Wind Tunnel IR Transparent optical window Unit under test (UUT) Variable speed fan The IR camera monitors the thermal performance of the Unit Under Test (UUT) under static steady-state conditions. A special optical port is used which is transparent to infrared wavelengths. IR Video Camera Heating element Precision low-rate anemometer 3” below UUT Ambient temperature sensor Airﬂow collimator Figure 6.