EXB250 SERIES

Single output

• High efficiency topology, 90% typical at 3.3V

• Industry standard footprint

• Wide baseplate temperature, -40˚C to +100˚C

(natural convection)

• 90% to 110% output trim

• No minimum load

• Overvoltage protection

• Remote on/off

The EXB250 is a new high efficiency, open frame, isolated 165 Watt converter

series in an industry standard half-brick footprint. The EXB250 delivers very high

output current at low voltages, and excellent useable power density for today's

high end applications. The design takes advantage of open frame construction to

provide a low weight, low thermal impedance baseplate design. The seven

models in the series feature an input voltage range of 33 to 75VDC and are

available in output voltages of 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V and 1.2V. The output

voltage on each model is adjustable from 90% to 110% of the nominal value.

Typical efficiencies for the models are 90% for the 3.3V, 88% for the 2.5V and 87%

for the 1.8V version. The EXB250 series also has a remote on/off capability.

Overcurrent and overvoltage protection features are included as standard. With full

international safety approval including EN60950 (TÜV Rheinland) and UL/cUL1950,

the EXB250 reduces compliance costs and time to market.

PAGE 1

[ 2 YEAR WARRANTY ]

NEW

Product

TÜV

International Safety Standard Approvals

UL/cUL : UL1950 File No. E135734

TÜV

TÜV Rheinland Certificate No. R2174184

CB Scheme No. US-TUVR-1085

EMC CHARACTERISTICS

Conducted emissions

EN55022 (See Note 2)

Level A

EN55022 (See Note 2)

Level B

Immunity:

ESD air

EN61000-4-2 8kV (NP), 15kV (NP)

ESD contact

EN61000-4-2 6kV ((NP), 8kV (NP)

Radiated field enclosure EN61000-4-3 10V/m (NP)

Conducted (DC power)

EN61000-4-6 10V (NP)

Conducted (signal)

EN61000-4-6 10V (NP)

Input transients

ETS 300 132-2, ETR 283

GENERAL SPECIFICATIONS

Efficiency

See table

Operational

Input/output

1500VDC

Input/baseplate

1500VDC

Switching frequency

Fixed

400kHz typ.

Approvals and

EN60950 (TÜV Rheinland)

standards (See Note 4)

UL/cUL1950

Material flammability

UL94V-0

Weight

73g (2.6oz)

MTBF

MIL-HDBK-217F

>224,000 hours

@ 40°C, 100% load

ground benign

ENVIRONMENTAL SPECIFICATIONS

Thermal performance

Operating baseplate

-40°C to +100°C

temperature

Non-operating

-40°C to +125°C

OUTPUT SPECIFICATIONS

Voltage adjustability

90% to 110%

Set point accuracy

±1.6% max.

Line regulation

1V2 Model

±0.2% max.

Low line to high line

All other models

±0.1% max.

Load regulation

Full load to min. load

±0.2% max.

Minimum load

0%

Overshoot

At turn-on and turn-off

None

Undershoot

1.2V, 1.5V, 1.8V. 2.5V

None

and 3.3V models

Ripple and noise

5Hz to 20MHz

60mV pk-pk

20mV rms

Transient response

6% max. deviation

(See Note 1)

150µs recovery to

within total error band

INPUT SPECIFICATIONS

Input voltage range

48Vin nominal

33 to 75VDC

Input current

No load

145mA max.

Remote OFF

35mA max.

Input current (max.)

5.7A max. @ Io max.

(See Note 3)

and Vin = 33 to 75V

Input reflected ripple

(See Note 5)

350mA (pk-pk) typ.

Active high remote ON/OFF

(See Note 7)

Logic compatibility

Open collector ref to -input

ON

Open circuit or >4.0VDC

OFF

<1.2VDC

Undervoltage lockout

Power up

32.5V (typ.)

Power down

30.5V (typ.)

Start-up time

Power up

10ms (typ.)

(See Note 6)

Remote ON/OFF

3ms (typ.)