DC/DC CONVERTERS

50W High Efficiency DC/DC Converters

1

2 YEAR WARRANTY

EXB50 Dual Series

Dual positive output

trim range (0.8V to 3.6V for EXB50-48D3V3-1V8,

1.5V to 5.25V for EXB50-48D05-3V3)

(natural convection)

The EXB50 Dual is a 50W independently regulated dual output DC/DC converter specifically

designed to meet the power needs of low voltage silicon. Housed in an open frame package

output, and up to 11A in total, at temperatures of up to 70ºC under natural convection. With

some forced air and/or reduced ambient temperatures, the EXB50 can deliver up to 8.5A from

either output, and up to 17A in total. The converter is primarily intended for the networking,

telecoms and wireless markets, where small size, lower output voltages with higher currents,

low profile and high efficiency are all key demands. Product features include wide output trim

and remote on/off. Overvoltage, short circuit and over-temperature protection combines to

make the EXB50 Dual a very robust and flexible product.

All specifications are typical at Vin = 48V, Io1 = 5A, Io2 = 5A, Tamb = 25°C unless otherwise stated

EMC CHARACTERISTICS

ETS 300 386-1 table 5

Conducted emissions

EN55022 with external filter

Level A

(See Note 3)

EN55022 with external filter

Level B

Radiated emissions

EN55022

Level A

Immunity:

ESD air

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

ESD contact

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

EFT DC power

EN61000-4-4 2kV (NP), 4kV (LFS)

EFT signal

EN61000-4-4 1kV (NP), 2kV (LFS)

Radiated field enclosure

EN61000-4-3 10V/m (NP)

Surges indoor signal

EN61000-4-5 500V (RP)

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

89% typ.

Basic insulation

Input/output

1500VDC

Input fuse 48V

(See Note 2)

4A slow blow HRC

Switching frequency

EXB50-48D3V3-1V8

250kHz

(fixed)

EXB50-48D05-3V3

300kHz

Approvals and

IEC60950

standards

UL/cUL1950

Material Flammability

UL94V-0

Weight

42g (1.48oz)

MTBF

MIL-HDBK-217

177,362 hours

ENVIRONMENTAL SPECIFICATIONS

Thermal performance

Operating ambient

-40°C to +100°C,

(See Notes 4 and 5)

temperature

see curves

Non-operating

-40°C to +120°C

ETS 300 019-2-3

Classes T3.1 to T3.5

Air temperature

Low: IEC 68-2-1

-40°C

High: IEC 68-2-2

+70°C

Change: IEC 68-2-14

-40°C to +70°C

Relative humidity

IEC 68-2-56

10% to 100% RH

IEC 68-2-30

Condensation

OUTPUT SPECIFICATIONS

Voltage adjustability

EXB50-48D3V3-1V8

0.8V to 3.6V

EXB50-48D05-3V3

1.5V to 5.25V

Voltage accuracy

Both outputs

±0.5% max.

Line regulation

Low line to high line

Vout1 ±0.5%

Low line to high line

Vout2 ±0.5%

Load regulation

Full load to no load

±0.5%

Minimum load

Both outputs

0%

Ripple and noise

Both outputs

150mV pk-pk max.

20MHz bandwidth

30mV rms max.

Transient response

3A to 5A (1A/10µs)

150mV

peak dev. settling time

and back

400µs

Short circuit protection

EXB50-48D3V3-1V8

17A rms

EXB50-48D05-3V3

15A rms

INPUT SPECIFICATIONS

Input voltage range

48Vin nominal

36 to 75VDC

Input current

No load

100mA max.

Remote OFF

4mA max.

UVLO turn ON voltage

All inputs

34V typ.

UVLO turn OFF voltage

All inputs

33V typ.

Active high remote ON/OFF

Logic compatibility

Open collector ref. to -input

ON

Open circuit voltage or >3.2VDC

OFF (See Note 7)

<0.4VDC

Active low remote ON/OFF

Logic compatibility

Open collector ref. to -input

ON

0.4VDC max.

OFF (See Note 7)

Open circuit voltage or >3.2VDC

SPECIFICATIONS

File Name: EXB50D.PDF Rev: 10 June 2002

TÜV