DC/DC CONVERTERS

40W High Efficiency DC/DC Converters

1

2 YEAR WARRANTY

EXA40 Series

Single output

(natural convection)

requirements

The EXA40 Series, comprising 8 different models is targeted specifically at the

telecommunications, industrial electronics, mobile Telecommunications and distributed

power markets. The series offers two wide input voltage ranges of 18-36VDC and

36-75VDC. Typical efficiencies are 91% for the 5V output, 88% for the 3.3V, 86%

for the 2.75V and 84% for the 1.8V. The series has been designed primarily for

Telecommunications applications and complies with ETS 300 386-1 immunity and

emission standards for high priority of service class. In addition the series complies

with ETS 300 019-1-3 environmental standards (all classes) including shock, vibration,

humidity and thermal performance. A high level of reliability has been designed into all

models through the extensive use of conservative derating criteria. Remote enable and

overtemperature shutdown are included as standard while true latching OVP is

available as an option.

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

SPECIFICATIONS

File Name: LF_EXA40.PDF Rev: 15 Jan 2002

OUTPUT SPECIFICATIONS

MINIMUM

TYPICAL

MAXIMUM

Voltage adjustability

2V75, 3V3, 5V outputs

±10%

±11%

±12%

1V8 output

+12/-17%

+13/-18%

+14/-19%

Line regulation

Low line to high line

+0.05%

+0.4%

Load regulation

Full load to no load

+0.20%

+0.4%

Output current range

0A

8A

Ripple and noise

20MHz bandwidth

50mV pk-pk

100mV pk-pk

20MHz bandwidth

10mV rms

20mV rms

Temperature coefficient

See Figure 4

±0.01%/°C

±0.02%/°C

OVP transient (See Note 6)

5V output

6.8V TVS

3V3/2V75 outputs

4.1V TVS

1V8 output

4.1V TVS

OVP latching (See Notes 1, 3)

5V output

6.0V

6.2V

6.4V

(optional)

3V3 output

4.0V

4.2V

4.4V

2V75 output

3.4V

3.6V

3.8V

1V8 output

2.4V

2.5V

2.6V

Short circuit protection (Note 5)

Continuous

Short circuit current (Note 5)

Rshort <20m

Ω

10A rms

12A rms

Transient response

Peak deviation

50% to 75% and back

100mV

150mV

Settling time

to 1.0%, no external cap

250µs

400µs

Current limit

Low line to high line

100%

140%

180%

Voltage accuracy

±1.0%

±1.5%

INPUT SPECIFICATIONS

MINIMUM

TYPICAL

MAXIMUM

Input voltage range

24Vin nominal

18VDC

24VDC

36VDC

48Vin nominal

36VDC

48VDC

75VDC

Input current

No load

50mA

100mA

Remote OFF, UVLO

2.5mA

4mA

Inrush current

ETS 300 132-2

UVLO turn ON voltage (Note 4)

All inputs

88%

94%

100%

UVLO turn OFF voltage (Note 4)

All inputs

77%

86%

94%

Start-up time

Nominal line

50ms

100ms