Performance/Functional Specifi cations
Input Voltage:
Continuous 75 Volts
Transient (100msec max.) 100 Volts
Input Reverse-Polarity Protection None, see notes. Install external fuse.
Output Current Current limited. Devices can
withstand an indefi nite output short
circuit without damage.
Storage Temperature –55 to +125°C
Lead Temperature (soldering, 10 sec.) +280°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 Specifi cations Table is not implied.
Absolute Maximum Ratings
Typical at TA = +25°C under nominal input voltage and full-load conditions unless noted.
Refer to required airfl ow and Derating curves for thermal specifi cations. [1]
Input
Input Voltage Range 36-75 Volts
Recommended External Fuse 20 Amp fast blow
Start-up Threshold 35V
Undervoltage shutdown 33.5V
Overvoltage shutdown None [note 12]
Input Current, nominal See ording guide
Input Current, V
IN = VMIN 6.00A
Input Current, shut-down mode 6.5mA max.
Inrush Transient 0.05A
2
-seconds
Refl ected Ripple Current [2] 15mAp-p
Internal Filter Type L-C
Reverse Polarity Protection None (see note 11), install external fuse
Remote On/Off Control [5]
Positive Logic On = Open or +3.5 to +13.5 V.
Off = Gnd. Pin or 0 to +1V.
Negative Logic On = Gnd. Pin or 0 to +1V.
Off = Pin open or +3.5V to +13.5V.
Current 2mA max.
Output
Total Output Power [3] 210W max. [15]
Setpoint Accuracy (50% load) ±3% of V
NOMINAL
Extreme Accuracy [14] 11.4V min. to 12.6V max.
Output Current [7] See ordering guide
Minimum Load No minimum load
Ripple and Noise (20MHz bandwidth) See ordering guide
Line and Load Regulation [10] See ordering guide
Effi ciency See ordering guide
Isolation Voltage (Input/output) 2250Vdc min.
(Input to baseplate) 1500Vdc min.
(Baseplate to output) 1500Vdc min.
Isolation Resistance 100M
Isolation Capacitance 1500pF
Isolation Safety Rating Basic
Current Limit Inception (98% of V
OUT) 27A, after warm up
Short Circuit Current [6] 5 Amps
(hiccup autorestart – remove short for
recovery)
Short Circuit Duration (+V
OUT grounded) Continuous, no damage
Overvoltage Protection 15Vdc max. via magnetic feedback
Max. Capacitive Loading (resistive load) 10,000μF, low ESR 0.02 Ohms
Temperature Coeffi cient ±0.02% per °C
Dynamic Characteristics
Dynamic Load Response 75μsec, 50-75-50% load step
(to within 3% of V
OUT) 100μsec, 25-75-25% load step
Start Up Time
(V
IN to VOUT regulated) 60msec
(Remote On to Vout regulated) 60msec
Fixed Switching Frequency 225 ±25kHz
Environmental
Calculated MTBF [4] 1,247,727 hours
Operating Case Temperature [13] +110°C max.
Electronic Thermal Shutdown +125°C min.
Operating Temperature Range -40ºC to +85ºC, See Derating curves
(With Derating)
Storage Temperature Range –55 to +125°C
Flammability UL94V-0
Relative Humidity To 85% / +85°C
Safety Compliance UL60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1
Electromagnetic Interference EN55022/CISPR22
conducted or radiated (may require external fi lters)
Physical
Pin Material Copper alloy with gold plate over nickel underplate
Weight 1 ounce (28.4 grams)
(1) All models are tested and specifi ed with external 1 || 10uF ceramic/tantalum output capacitors and external
22uF input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our
test equipment and may not be required to achieve specifi ed performance in your applications. All models are
stable and regulate within spec under no-load conditions.
General conditions for Specifi cations are +25°C, VIN = nominal, VOUT = nominal, full load.
(2) Input Ripple Current is tested and specifi ed over a 5 Hz to 20 MHz bandwidth. Input fi ltering is CIN = 33μF/100V
tantalum, CBUS = 220μF/100V electrolytic, LBUS = 12μH.
(3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher
temperatures and/or lower airfl ow, the DC/DC converter will tolerate brief full current outputs if the total RMS
current over time does not exceed the Derating curve. All Derating curves are presented at sea level altitude. Be
aware of reduced power dissipation with increasing density altitude.
(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fi xed
conditions, TPCBOARD = +25°C, full output load, natural air convection.
(5) The On/Off Control may be driven with external logic or by applying appropriate external voltages which are
referenced to Input Common. The On/Off Control Input should use either an open collector/open drain transistor
or logic gate which does not exceed +13.5V.
(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting.
(7) The outputs are not intended to sink appreciable reverse current.
(8) Output noise may be further reduced by adding an external fi lter. See I/O Filtering and Noise Reduction.
(9) All models are fully operational and meet published specifi cations, including “cold start” at –40°C.
(10) Regulation specifi cations describe the deviation as the line input voltage or output load current is varied from a
nominal midpoint value to either extreme.
(11) If reverse polarity is accidentally applied to the input, a body diode will become forward biased and will accept
considerable current. To ensure reverse input protection with full output load, always connect an external input
fuse in series with the +VIN input. Use approximately twice the full input current rating with nominal input
voltage.
(12) Input overvoltage shutdown on 48V input models is normally deleted in order to comply with certain telecom
reliability requirements. These requirements attempt continued operation despite signifi cant input overvoltage.
(13) Note that the converter may operate up to +110°C PCB temperature with the baseplate installed. However,
thermal self-protection occurs near +125°C and there is a temperature gradient from high power components.
Therefore, +100°C baseplate temperature is recommended to avoid thermal shutdown.
(14) “Extreme accuracy” refers to all combinations of line and load regulation, output current, initial setpoint
accuracy and temperature coeffi cient.
(15) Vo = (11.64V to 12.36V)
Power = (197.88W to 210.12W)
RBC-12/17-D48 Series
Quarter Brick, Regulated Bus Converters
MDC_RBC-12/17-D48.C02 Page 3 of 10
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