EMERSON BXB50 User Manual

The BXB50 Series are high power density dc-dc converters
packaged in the industry standard footprint (2.40 x 2.28 x 0.50
inches) to give designers optimum choices when specifying for
both new and replacement designs. Suitable for a wide range of
applications in nearly any industry, the BXB50 was particularly
designed with communication and distributed power applications
in mind. Using Bellcore 332, the MTBF is greater than 1,400,000
hours. Aluminum baseplate technology with four threaded M3
inserts makes heatsink attachment and optimum thermal
management easy. The BXB50 series are approved to IEC950 by
UL, CSA and VDE.

Embedded Power for
Business-Critical Continuity

BXB50 Series

Single output

Special Features

• Industry standard footprint
MTBF >1.4 million hours
(Bellcore 332)

• Input voltage to ETS300-132-2

• Adjustable output voltage

• No minimum load required

• Separate case ground pin

• 2:1 input range for battery
powered applications

• Undervoltage lockout (UVLO)

• UL, VDE and CSA
safety approvals

• Available RoHS compliant

• 2 year warranty

Total Power: 33 - 50W
Input Voltage: 18 - 36VDC

36 - 75VDC

# of Outputs: Single

Safety

VDE0805/EN60950/IEC950
File No. 10401-3336-0205
Licence No. 40012035

UL60950 File No. E136005

CSA C22.2 No. 950
File No. LR41062C

Rev.03.08.07

bxb50s

1 of 4

Rev.03.08.07

bxb50s

2 of 4

Embedded Power for
Business-Critical Continuity

All specifications are typical at nominal input, full load at 25°C unless otherwise stated.

Specifications

OUTPUT SPECIFICATIONS

Voltage adjustability 60% to 110%

Set point accuracy ±1.0%

Line regulation Low line to high line ±0.05%

Load regulation Full load to min. load ±0.10%

Minimum load 0%

Overshoot At turn-on and turn-off None

Undershoot None

Ripple and noise 3.3 V and 5 V 75 mV pk-pk,
(5 Hz to 20 MHz) 20 mV rms
(See Note 1) 12 V and 15 V 100 mV pk-pk,

30 mV rms

Temperature coefficient ±0.01%/°C

Transient response ±2.0% max. deviation
(See Note 2) 170 μs recovery

to within ±1.0%

Remote sense 0.5 Vdc transmission

line drop compensation

INPUT SPECIFICATIONS

Input voltage range 24Vin nominal 18-36 Vdc

48Vin nominal 36-75 Vdc

Input current No load 100 mA max.

Remote OFF 20 mA max.

Input current (max.) 48 V models 3.5 A max. @ Io max.
(See Note 4) and Vin = 0 to 75 V

Input reflected ripple (See Note 6) 5 mA pk-pk

Active low remote ON/OFF (See Note 7)
Logic compatibility Open collector ref to -input
ON 1.2 Vdc max.
OFF Open circuit

INPUT SPECIFICATIONS CONTINUED

Undervoltage lockout 24 Vin: power up 17 V

24 Vin: power down 16 V
48 Vin: power up 34 V
48 Vin: power down 32.5 V

Start-up time Power up 20 ms
(See Note 8) Remote ON/OFF 20 ms

EMC CHARACTERISTICS

Conducted emissions Bellcore 1089 Level A
(See Note 3) FCC part 15 Level A

EN55022, CISPR22 Level A

GENERAL SPECIFICATIONS

Efficiency See table

Isolation voltage Input/case 1500 Vdc

Input/output 1500 Vdc
Output/case 1500 Vdc

Switching frequency Fixed 500 kHz typ.

Approvals and VDE0805, EN60950, IEC950
standards (See Note 5) UL1950, CSA C22.2 No. 950

Case material Aluminum baseplate with plastic case

Material flammability UL94V-0

Weight 110 g (3.88 oz)

MTBF Bellcore 332 1,400,000 hours

MIL-HDBK-217F 580,000 hours
@ 40 °C, 100% load min.

ENVIRONMENTAL SPECIFICATIONS

Thermal performance Operating case temp. -40 °C to +100 °C

Non-operating -55 °C to +125 °C

Altitude Operating 10,000 feet max.

Non-operating 40,000 feet max.

Vibration 5-500 Hz 2.4 G rms (approx.)