©1995, KEPCO, INC
228-1158
1
Data subject to change without notice
I N S T R U C T I O N M A N U A L
FAW
KEPCO
KEPCO, INC.
"
131-38 SANFORD AVENUE
"
FLUSHING, NY. 11352 U.S.A.
"
TEL (718) 461-7000
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FAX (718) 767-1102
http://www.kepcopower.com
"
email: [email protected]
An ISO 9001 Company.
KEPCO SINGLE OUTPUT 100 WATT
HIGH FREQUENCY SWITCHING POWER SUPPLIES
I — INTRODUCTION
The Kepco FAW 100 Watt Series low profile high frequency switching power supplies employ forward conversion and operate with a 78% effi-
ciency with either a-c or d-c input. A resistor and thyristor soft-start circuit limits start-up surge. Surface mount technology permits efficient
component layout for minimum mounting space. Six models may be selected for outputs of 5, 12, 15, 24, 28, or 48V. “POWER OK” logic and a
green “POWER OK” LED are provided. A steel cover (Model CA 27) is available as an option. Output voltage may be adjusted with a trimmer
accessible near the input-output terminal strip (R65, see Figure 4, View “A”). When the input is cut off, the output is maintained for 15 millisec-
onds minimum. If the power supply shuts down, it is then necessary to wait 90 seconds minimum (120V a-c input) or 120 seconds minimum
(240V a-c input) before reconnecting the a-c input power to turn on the unit again. EMI filtering meets FCC Class B (100 to120 Volts) rating
and VDE 0871 Class B (220 to 240 Volts) rating. This page contains specifications for each model of the FAW 100 Watt Series. Environmental
specifications for each model are the same.
II — SPECIFICATIONS
The following specifications apply to FAW 100 Watt Series models. Other FAW Series models are also available; consult your Kepco represen-
tative for their specifications.
INPUT:
Voltage: 120V a-c/240V a-c nominal; Range 85-264V a-c; 105-370V d-c (polarity insensitive).
Frequency: Nominal 50-60 Hz; Range 47-440Hz (at 440Hz leakage current exceeds UL/VDE safety leakage standards).
Current (nominal output at rated load): @120V a-c rms: 2.0A typ., 2.4A max; @240V a-c rms: 1.0A typ., 1.6A max.
Initial Turn-on Surge: (one-half of first input cycle): @120V a-c rms, 25A max; @240V a-c rms, 50A max. When the a-c input power is
removed, the soft start circuit requires 30 seconds recovery time before the a-c input power is reconnected.
Brownout Voltage: 80V a-c, 97V d-c.
Switching Frequency: 150KHz typical, nominal load.
STABILIZATION:
Source Effect: Range 85-132V a-c or 170-264V a-c, 1.0% typ.; 2.0% max.
Load Effect: Range 10%-100% load, 1.0% typ.; 2.0% max.
Temperature Effect: Range 0
o
to 50
o
C, 1.0% typ.; 2.0% max.
Combined Effect: 2.0% typ.; 4.0% max. (includes source, load, and temperature effects).
Time Effect: 0.1% typ.; 0.5% max. (1/2 hr-8 hr at 25
o
C).
RECOVERY CHARACTERISTICS:
A step load change from 50% to 100% produces less than +4% output excursion. Recovery occurs
to 1% of the original setting in <1 ms (t
r
or t
f
equal to or greater than 50
µ
sec at load change).
START-UP TIME:
200 ms. maximum.
TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, FAW 100W SERIES
MODEL
FAW 5-20K
FAW 12-8.3K
FAW 15-6.6K
FAW 24-4.2K
FAW28-3.5K
FAW 48-2K
OUTPUT VOLTS, d-c (NOMINAL)
5V
12V
15V
24V
28V
48V
ADJUSTMENT RANGE
4.5 - 5.5V
10.8 - 13.2V
13.5 - 16.5V
21.6 - 26.4V
25.2 - 30.8V
38.4 - 52.8V
OUTPUT CURRENT (NOMINAL)
(1)
(1) Derates same as Ouptut Power.
20A
8.3A
6.6A
4.2A
3.5A
2.0A
OUTPUT POWER (MAXIMUM)
(2)
(2) See power derating curve, Figure 1.
100W
99.6W
99W
100.8W
98W
96W
RIPPLE
AND
NOISE
(mV p-p)
0-50°C
10-100% LOAD
source (typ)
10
15
15
20
20
20
source (max)
15
30
40
40
40
40
switching (typ)
30
35
40
50
60
80
switching (max)
65
70
80
110
140
220
spike noise (d-c—50MHz)
<120
<190
<220
<310
<330
<530
OVERVOLTAGE SETTING (25 °C, NOM. INPUT)
6.0-6.9V
13.7-15.7V
17.0-19.0V
27.0-30.5V
32.0-35.0
53.5-60.0
OVERCURRENT SETTING (25°C, NOM. INPUT)
Rectangular type characteristic
21.0 - 24.0A
8.7 - 10.0A
7.0 - 8.0A
4.4 - 5.2A
3.7 - 4.2A
2.1 - 2.4A
