KEPCO FAK 25W Series User Manual

Kepco

228-1160

I N S T R U C T I O N M A N U A L

FAK

KEPCO

KEPCO, INC. !"! 131-38 SANFORD AVENUE !" FLUSHING, NY. 11352 U.S.A.!" TEL (718) 461-7000!"! FAX (718) 767-1102!!

http://www.kepcopower.com "! email: [email protected]

An ISO 9001 Company.

KEPCO 25 WATT HIGH FREQUENCY

SWITCHING POWER SUPPLIES

I — INTRODUCTION

The Kepco FAK 25 Watt Series low profile high frequency switching power supplies employ forward conversion and operate at 80% efficiency
with either a-c or d-c input. A thermistor soft-start circuit limits start-up surge. Surface mount technology permits efficient compact topology for
minimum mounting space. Four models may be selected for outputs of 5, 12, 15 or 24V. A green “POWER OK” light is provided. A steel cover
(Model CA 22) is available as an option. Output voltage may be adjusted with a trimmer accessible near the input-output barrier strip. When
the input is cut off, the output is maintained for 20–30 milliseconds (30 milliseconds typical). EMI filtering meets FCC Class B rating. Table 1
contains specifications for each model of the FAK 25 Watt Series. Environmental specifications for each model are the same.

II — SPECIFICATIONS

The following specifications apply to FAK 25 Watt Series models.

INPUT:

Voltage: 115V a-c nominal; Range 85-132V a-c; 110-170V d-c.
Frequency: Nominal 50-60 Hz; Range 47-440Hz (at 440Hz leakage current exceeds UL safety spec. limit).
Current: 0.5A typ., 0.65A max. (nominal output at rated load @25° C).
Initial Turn-on Surge: 43A max. (one-half of first input cycle).

STABILIZATION:

Source Effect: 0.6% typ.; 2.0% max. from minimum to maximum input.
Load Effect: 1.2% typ.; 3.0% max. (range: 10%-100% load).
Temperature Effect: 0.6% typ.; 2.0% max. (range: 0

to 50

C).

Combined Effect: ±1.0% typ.; ±3.0% max. (includes source, load, and temperature effects).
Drift: 0.1% typ.; 0.5% max. (1/2 hr—8 hr at 25

C).

RECOVERY CHARACTERISTICS:

A step load change from 50% to 100% produces less than +4% output excursion. Recovery occurs to

within +1% of the original setting in <1 ms (t

or t

equal to or greater than 50

sec at load change).

START-UP TIME:

100 ms. maximum.

HOLD-UP TIME:

30 ms. typ. (20 ms. min).

DIELECTRIC STRENGTH:

Between input and output: 2KV a-c for one minute.
Between input and ground terminals: 2KV a-c for one minute.

LEAKAGE CURRENT

(UL method, 115V a-c, 50-60Hz): 0.5 mA maximum.

SAFETY:

UL 478 recognized; CSA 1402 certified.

EMI:

Designed to meet FCC 20780. Class B.

VIBRATION:

(non-operating, one hour on each one of the three axes):

5-10 Hz, 10 mm amplitude.
10-55 Hz, 2g acceleration.

SHOCK:

(non-operating, one-half sinusoidal pulse, three shocks to each axis):

Acceleration: 20g
Duration: 11ms +5ms

OPERATING TEMPERATURE:

See Figure 1.

STORAGE TEMPERATURE:

-40

C to +75

OPERATING AND STORAGE RELATIVE HUMIDITY:

20%–95% (non-condensing).

FUSE:

Medium acting 2.5A, 125V; (5.2 x 20mm), Nagasawa P/N GGS2.5A; Kepco P/N 541-0058.

WARRANTY:

1 year.

TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, FAK 25W SERIES

MODEL

FAK 5-5K

FAK 12-2.1K

FAK 15-1.7K

FAK 24-1.1K

OUTPUT VOLTS, d-c (NOMINAL)

5.0V

12.0V

15.0V

24.0V

ADJUSTMENT RANGE

4.5-5.5V

10.8-13.2V

13.5-16.5V

21.6-26.4V

OUTPUT CURRENT (NOMINAL)

5.0A

2.1A

1.7A

1.1A

OUTPUT POWER (MAXIMUM)

25.0W

25.2W

25.5W

26.4W

RIPPLE

AND

NOISE

(mV p-p)

0-50°C

10-100% LOAD

source (typ)

source (max)

switching (typ)

switching (max)

spike noise (d-c—50MHz)

120

190

220

310

OVERVOLTAGE SETTING 25 °C, NOM. INPUT

6.0-6.9V

13.7-15.7V

17.0-19.0V

27.0-30.5V

OVERCURRENT SETTING 25 °C, NOM. INPUT

5.5-7.5A

2.3-3.3A

1.9-2.8

1.2-1.8

FIGURE 1. OUTPUT POWER VS. AMBIENT

TEMPERATURE

3040229