©1996, KEPCO, INC
1
Data subject to change without notice
228-1159
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
!!"!
FAX (718) 767-1102
!!
http://www.kepcopower.com
"!
email: [email protected]
An ISO 9001 Company.
KEPCO SINGLE OUTPUT 150 WATT
HIGH FREQUENCY SWITCHING POWER SUPPLIES
I — INTRODUCTION
The Kepco FAW 150 Watt Series low profile high frequency switching power supplies employ forward conversion and operate with a 78% efficiency
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 28) 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 milliseconds 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 150 Watt Series. Environmental specifications for each model are the same.
II — SPECIFICATIONS
The following specifications apply to FAW 150 Watt Series models. Other FAW Series models are also available; consult your Kepco representative 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: 3.0A typ., 3.5A max; @240V a-c rms: 1.5A typ., 2.0A 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: 120KHz 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 within
+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.
HOLD-UP TIME:
20 ms. typ. (120V a-c), 15 ms. min (100V a-c).
TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, FAW 150W SERIES
MODEL
FAW 5-30K
FAW 12-12K
FAW 15-10K
FAW 24-6K
FAW28-5K
FAW 48-2.8K
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.
30A
12A
10A
6A
5A
2.8A
OUTPUT POWER (MAXIMUM)
(2 )
(2) See power derating curve, Figure 1.
150W
144W
150W
144W
140W
134.4W
RIPPLE
AND
NOISE
(mV p-p)
0-50°C
10-100% LOAD
source (typ)
10
15
15
15
20
20
source (max)
20
30
40
40
40
40
switching (typ)
30
35
40
50
60
80
switching (max)
60
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
32.0 - 36.0A
13.0 - 15.0A
11.0 - 13.0A
6.3 - 7.5A
5.3 - 6.1A
3.0 - 3.5A
