0

20W

-40

° C -20° C0° C20° C40° C60° C80° C

100

° C

105

° C

DERATING CURVE

Output Power (Watts)

Ambient Temperature

NFC20 SERIES

Single and dual output

[ 2 YEAR WARRANTY ]

• 20 Watts output power

• 2:1 input voltage range

• Remote ON/OFF control

• UL, CSA and VDE safety approvals

• Overvoltage protection

• Extended operating temperature range

• Fixed switching frequency

The NFC20 series of DC/DC converters offers 20 Watts of output power from

the industry standard 2 x 1.6 x 0.46 inch case without a heatsink. Advantages of

the NFC20 include increased power density, fixed switching frequency, tight line

and load regulation, reduced board area requirements and many standard

features. Among these features are remote on/off control, overvoltage

protection, synchronization function and an extended operating temperature

range option. Input voltage ranges of 18-36VDC and 36-72VDC mean that the

NFC20 is ideally suited to process control, industrial automation, distributed

power and telecommunications applications.

PAGE 120

GENERAL SPECIFICATIONS

Efficiency

83% typical

Isolation voltage

Input/output

1000VAC/710VDC

Switching frequency

Fixed

200kHz ±5.0%

Approvals and

VDE0805, EN60950

standards

IEC950, UL1950

CSA C22.2 No. 950

Case material

Aluminum alloy, hard

black anodized finish

Cover material

10% glass reinforced

polyetherimide GE ULTEM

#2110 or equivalent

Material flammability

UL94V-0

Weight

45g (1.6oz)

MTBF

MIL-HDBK-217F

260,000 hours

ENVIRONMENTAL SPECIFICATIONS

Thermal performance

Operating ambient

-25°C to +60°C

Option (See Note 6)

-40°C to +60°C

Non-operating amb.

-55°C to +125°C

Max. case temperature,

+110°C max.

Derating

See curve

Cooling, vertical mount

Free air

convection cooled

OUTPUT SPECIFICATIONS

Voltage accuracy

±0.5%

Voltage adjustability

All outputs

±10%

Line regulation

LL to HL, single output

±0.1%

LL to HL, dual output

±0.1%

Load regulation

FL to NL, single output

±0.5%, max.

FL to NL, dual output

±3.0%, max.

Ripple and noise

Singles

75mV pk-pk, max.,

(5Hz to 20MHz)

20mV rms

Duals

100mV pk-pk, max.

Temperature coefficient

±0.02%/°C max.

Overvoltage protection

Single output

125% Vout

Dual output

125% Vout total

Short circuit protection

(See Note 7)

Continuous

(Clamp)

automatic recovery

INPUT SPECIFICATIONS

Input voltage range

24VDC

18 to 36VDC

48VDC

36 to 72VDC

No load input current

20mA

Input filter

(See Note 5)

External capacitor

Surge protection

24VDC

50V for 100ms

48VDC

100V for 100ms

Remote ON/OFF

Logic compatibility

CMOS/TTL

Logic ON

Logic high or open

Logic OFF

Logic low or Jumper

pin 2 and 4

Frequency

Switching frequency

synchronization

±10%

Synchronization

Negative going pulse

function

on pin 4, max. 25%

duty cycle