Performance/Functional Specifications

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 indefinite 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 Specifications Table is not implied.

Absolute Maximum Ratings

Refer to required airflow and Derating curves for thermal specifications. [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

6.00A

Input Current, shut-down mode

6.5mA max.

Inrush Transient

Reflected 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)

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

Efficiency

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

27A, after warm up

Short Circuit Current [6]

5 Amps

(hiccup autorestart – remove short for

recovery)

Continuous, no damage

Overvoltage Protection

15Vdc max. via magnetic feedback

Max. Capacitive Loading (resistive load)

10,000μF, low ESR 0.02 Ohms

Temperature Coefficient

±0.02% per °C

Dynamic Characteristics

Dynamic Load Response

75μsec, 50-75-50% load step

100μsec, 25-75-25% load step

Start Up Time

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 filters)

Physical

Pin Material

Copper alloy with gold plate over nickel underplate

Weight

1 ounce (28.4 grams)

(1)

All models are tested and specified 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 specified performance in your applications. All models are

stable and regulate within spec under no-load conditions.

General conditions for Specifications are +25°C, VIN = nominal, VOUT = nominal, full load.

(2)

Input Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering 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 airflow, 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 fixed

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 filter. See I/O Filtering and Noise Reduction.

(9)

All models are fully operational and meet published specifications, including “cold start” at –40°C.

(10) Regulation specifications 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 significant 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 coefficient.

(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.B02 Page 3 of 10

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