DC-DC CONVERTERS 40 W 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 Vdc to 36 Vdc and

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

for the 2.75 V and 84% for the 1.8 V. 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

EMC CHARACTERISTICS (Cont.)

Radiated emissions

EN55022 (See Design Note 102) Level B

ESD air

EN61000-4-2, level 3

ESD contact

EN61000-4-2, level 4

Surge (500 V)

EN61000-4-5, level 3, 4

Fast transients

EN61000-4-4, level 3, 4

Radiated immunity

EN61000-4-3, level 3

Conducted immunity

EN61000-4-6, level 3

GENERAL SPECIFICATIONS

Efficiency

See table

Basic insulation

Input/output

1500 Vdc

Input fuse 24 V

(See Note 8)

3.5 A slow blow

Input fuse 48 V

2.0 A slow blow

Switching frequency

Fixed

300 kHz

Approvals and

EN60950

standards

UL1950

(See Notes 7, 8, 9)

CSA C22.2 No. 950

Weight

25 g (0.88 oz)

MTBF

MIL-HDBK-217

250,000 hours

(See Design Note 102)

ENVIRONMENTAL SPECIFICATIONS

Thermal performance

Operating ambient

-40 °C to +70 °C,

temperature

See curves

Non-operating

-55 °C to +105 °C

Over temperature

Loss of Function

75 °C to +85 °C

shutdown

Self-Recovery (LFS)

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 68-2-1

-40 °C to +70 °C

Relative humidity

IEC 68-2-56

10% to 100% RH

IEC 68-2-30

Condensation

Vibration, Class 3M5

IEC68-2-6

2-9 Hz, 3 mm disp.

9-200 Hz 1 g

MIL-STD-202F

Method 204 cond. A

Shock, Class 3M5

IEC-68-2-29

MIL-STD-202F

Method 213B cond. A

SPECIFICATIONS

File Name: exa40.pdf Rev (02): 09 Dec 2005

OUTPUT SPECIFICATIONS

Voltage adjustability

2.75 V, 3.3 V, 5 V

±10% min.

(See Note 10)

1.8 V output

+12/-17% min.

Voltage accuracy

±1.0%

Line regulation

Low line to high line

+0.05%

Load regulation

Full load to no load

+0.20%

Minimum load

0%

Ripple and noise

100 mV pk-pk max.

20 MHz bandwidth

20 mV rms max.

Temperature coefficient

±0.01%/°C

Transient response

50% to 75% and back

100 mV

Peak dev. settling time

to 1.0%, no external cap.

250 µs

Short circuit protection

Continuous

(See Note 5)

automatic recovery

INPUT SPECIFICATIONS

Input voltage range

24 Vin nominal

18-36 Vdc

48 Vin nominal

36-75 Vdc

Input current

No load

100 mA max.

Remote OFF

4 mA max.

UVLO turn ON voltage

All inputs (See Note 4)

94%

UVLO turn OFF voltage

All inputs (See Note 4)

86%

Start-up time

Nominal line

50 ms

Active high remote ON/OFF

Logic compatibility

Open Collector

ref. to -input

ON

Open circuit voltage

4.5 Vdc

OFF

<1.0 Vdc

INPUT SPECIFICATIONS

ETS 300 386-1 table 5

Conducted emissions

EN55022, internal filter and

Level A

(See Design Note 102)

two 4 µF film capacitors

EN55022, external filter

Level B