LOW TO MEDIUM POWER AC/DC POWER SUPPLIES

25W AC/DC Universal Input Switch Mode Power Supplies

1

2 YEAR WARRANTY

NFS25 Series

Dual and triple output

The NFS25 series is a 25W universal input AC/DC power supply on a 5 x 3 inch card

with a maximum component height of 1.2 inches for use in 1U applications. The NFS25

series is available with a wide range of models in the industry standard 5 x 3 inch

footprint and has proven itself to be reliable and versatile product for a wide range of

communication and industrial applications. The NFS25 provides 25W of output power

with free air convection cooling which can be boosted to 30W with 20CFM of air.

Standard features include OVP and short circuit protection. The series, with full

international safety approval and the CE mark, meets conducted emissions EN55022

level A. The NFS25 series is designed for use in low power data networking, computer,

telecom and industrial applications such as wireless switchers, hubs, POS terminals,

PABX’s and machine control. This list is not exclusive as the generic feature of the

series with industry standard output configurations provide a solution for most high

volume applications including many industrial applications.

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

EMC CHARACTERISTICS

Conducted emissions

EN55022, FCC part 15

Level A

Radiated emissions

EN55022, FCC part 15

Level A

ESD air

EN61000-4-2, level 3

Perf. criteria 1

ESD contact

EN61000-4-2, level 4

Perf. criteria 1

Surge

EN61000-4-5, level 3

Perf. criteria 1

Fast transients

EN61000-4-4, level 3

Perf. criteria 1

Radiated immunity

EN61000-4-3, level 3

Perf. criteria 2

Conducted immunity

EN61000-4-6, level 3

Perf. criteria 1

GENERAL SPECIFICATIONS

Hold-up time

110VAC input

16ms

230VAC input

80ms

Efficiency

25W output

70% typical

Isolation voltage

Input/output

3000VAC

Input/chassis

1500VAC

Switching frequency

Variable

Approvals and

IEC950, IEC1010, EN60950

standards

UL1950, VDE0805

(See Note 10)

CSA C22.2 No. 950

Weight

280g (9.6oz)

MTBF (See Note 9)

MIL-HDBK-217E, 25°C

170,000 hours

ENVIRONMENTAL SPECIFICATIONS

Thermal performance

0°C to 50°C ambient,

25W max.

(See Notes 6, 7, 8)

convection cooled

50°C to +70°C ambient

Derate to

convection cooled

50% load

Peak (0°C to +50°C,

35W

max. 60 seconds)

Non-operating

–40°C to +85°C

Relative humidity

Non-condensing

5% to 95% RH

Altitude

Operating

10,000 feet max.

Non-operating

30,000 feet max.

Vibration

Random vibration

2.4G rms approx.

Three orthogonal axes

5Hz to 500Hz

10 min. test per axis

OUTPUT SPECIFICATIONS

Output power

Continuous

25W

(See Note 2)

Peak (60s)

35W

Line regulation

Main output (Output 1)

±0.2% max.

LL to HL, FL

Output 2

±1% max.

Output 3

±0.2% max.

Total regulation

Main output (Output 1)

±2.0% max.

(See Notes 4, 5)

Auxiliary output 2

see table

Auxiliary output 3

see table

Overshoot/undershoot

At turn-on

0%

Transient response

+5V

±120mV max. dev.

(1.5 to 3A step)

500µs recovery

Temperature coefficient

All outputs

±0.02%/°C max.

Overvoltage protection

+5V output

6.25V ±0.75V

Output power limit

Primary power

60W Pin limit max.

limited

35W Pout limit min.

Short circuit protection

Continuous

INPUT SPECIFICATIONS

Input voltage range

Universal input

85 to 264VAC

120 to 370VDC

Input frequency range

47 to 440Hz

Input surge current

110VAC, cold start

15A max.

230VAC, cold start

32A max.

Safety ground

132VAC, 60Hz

0.62mA max.

leakage current

264VAC, 50Hz

1mA max.

SPECIFICATIONS

File Name: NFS25.PDF Rev: 01 Jan 2000