Rev.11.26.07

rfb300/350

2 of 6

Embedded Power for

Business-Critical Continuity

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

External output capacitance required (See Note 4).

Specifications

ABSOLUTE MAXIMUM RATINGS

Input voltage - peak

24 Vin

-0.5-50 Vdc

(100 ms max.,

48 Vin

-0.5-100 Vdc

1.0 % duty cycle max.)

Input voltage continuous

24 Vin

-0.5-40 Vdc

48 Vin

-0.5-80 Vdc

Adjust pin voltage (with

-0.5-12 Vdc

respect to -sense pin)

OUTPUT SPECIFICATIONS

Voltage adjustability

12 Vout

7.2-13.2 Vdc

28 Vout

16.8-29.4 Vdc

Min./max. load

12 Vout

0/25 A, 0/29.2 A

28 Vout

0/11 A, 0/12.5 A

Output load capacitance

12 Vout

470 μF to 4,700 μF

(See Note 10)

28 Vout

330 μF to 3,300 μF

Rise time

(See Note 12)

5 ms typ.

INPUT SPECIFICATIONS

Input current

24 Vin

23.8 A max. @ lo max.

(See Note 3)

48 Vin RFB300

11.2 A max. @ lo max.

48 Vin RFB350

13 A max. @ lo max.

Input reflected ripple

24 Vin

12 mA (pk-pk)

(See Note 4)

48 Vin 12 V model

42 mA (pk-pk)

48 Vin 28 V model

28 mA (pk-pk)

Input capacitance -

24 Vin

39 μF

Internal filter

48 Vin

13 μF

Inrush current

(See Note 11)

EMC CHARACTERISTICS

Conducted emissions

EN55022

See Application Note 167

Radiated emissions

EN55022

See Application Note 167

GENERAL SPECIFICATIONS

Efficiency

24 Vin 12 V model

86%

24 Vin 28 V model

90%

Vin = Vin (nom),

48 Vin 12 V model

88%

Iout (max.)

48 Vin 28 V model

91%

Approvals and

VDE IEC60950

standards

IECEE CB, UL/cUL60950

Material Flammability

UL94V-0

Weight

0.5 inch tall version

110 g (3.88 oz.)

MTBF @ 55 °C

12 V model

1,900,000 hours min.

Telcordia SR-332 Issue 1

28 V model

2,400,000 hours min.

ENVIRONMENTAL SPECIFICATIONS

Thermal performance

Operating baseplate,

-40 °C to +100 °C

temperature

Non-operating

-40 °C to +100 °C

RC PIN ELECTRICAL INTERFACE

Open collector compatible (See AN 167 for remote ON/OFF)

RC:

ON voltage

(See Note 13)

5 V min.

Open circuit voltage

5 V min, 11 V typ

13 V max.

High level leakage current (See Note 14)

-25 μA max.

OFF voltage

(See Note 15)

1.2 V max.

Low level input current

(See Note 16)

-250 μA max.

OUTPUT

INPUT

OUTPUT

OUTPUT

OUTPUT

EFFICIENCY

REGULATION

MODEL

POWER

VOLTAGE

VOLTAGE

CURRENT

CURRENT

(TYP.)

LINE

LOAD

(MAX.)

(MIN.)

(MAX.)

300 W

18-36 Vdc

7.2-13.2 Vdc

0 A

25 A

86%

±0.15%

±0.2%

RFB300-24S12Y

308 W

18-36 Vdc

16.8-29.4 Vdc

0 A

11 A

90%

±0.15%

±0.2%

RFB300-24S28Y

308 W

36-75 Vdc

16.8-29.4 Vdc

0 A

11 A

91%

±0.15%

±0.2%

RFB300-48S28Y

350 W

36-75 Vdc

7.2-13.2 Vdc

0 A

29.2 A

88%

±0.15%

±0.2%

350 W

36-75 Vdc

16.8-29.4 Vdc

0 A

12.5 A

91%

±0.15%

±0.2%

RFB350-48S28Y

Ordering Information