KEPCO RAX 100W - Manual

©2000, KEPCO, INC 1
Data subject to change without notice 228-1226 REV 3
I N S T R U C T I O N M A N U A L
RAX
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.
100 WATT SINGLE OUTPUT
SWITCHING POWER SUPPLIES
I — INTRODUCTION
SCOPE OF MANUAL. This instruction manual covers the installation and operation of the Kepco RAX 100W Series of Switch-
ing Power Supplies. For service information, please refer to the Service Manual for the RAX 100W Series, which can be pur-
chased either from your Kepco Representative, or by writing directly to: Kepco Inc. 131-38 Sanford Avenue, Flushing, New York
11352, U.S.A. When ordering a Service Manual, please state Model Designation and Serial Number of your RAX power
supply. This information can be found on the nameplate of the unit.
DESCRIPTION. The Kepco RAX 100W Series consists of seven models of switching power supplies, with a single output as
shown in Table 1. Units may be operated with either 115V a-c or 230V a-c 47-440Hz input. They will also operate on 240V to
370V d-c input. The RAX 100W Series employs a light weight ferrite core with 140 KHz switching frequency. Regulation is pro-
vided by pulse width modulation. A FET power stage, operating in the forward conversion mode provides a smooth isolated d-c
output. A triac “soft-start” circuit prevents excessive turn-on current surge. Overvoltage protection and optically isolated remote
TTL on-off control is provided. Current limiting with automatic recovery from short circuit is featured. Units are enclosed in a
wrap-around aluminum case with an LED “output present” light visible on the terminal side of the case.
Table 1 contains specifications and operating limits of individual RAX 100W Series models. Section II (ollowing) contains speci-
fications and operating limits common to all RAX 100W Series Models.
II — SPECIFICATIONS
The following specifications are at nominal input voltages at 25°C unless otherwise specified.
INPUT VOLTAGE: (Jumper selectable, see Section III, FIG. 3):
120V a-c nominal, range: 85 -132V a-c
220-240V a-c nominal, range: 170 -264V a-c
320V d-c nominal, range: 240 -370V d-c
For d-c input the jumper is placed in the 230V position.
INPUT SOURCE FREQUENCY:
Nominal 50/60 Hz; Range 47-440 Hz. (At 440 Hz the leakage current exceeds the VDE safety specification limit.)
TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, RAX 100W SERIES
MODEL RAX 3.3-20K RAX 5-20K RAX 12-8.3K RAX 15-6.6K RAX 24-4.2K RAX28-3.5K RAX 48-2K
OUTPUT VOLTS, d-c 3.3V 5V 12V 15V 24V 28V 48V
ADJUSTMENT RANGE 1.8 - 3.6V 4.0 - 5.5V 8.4 - 13.2V 12.0 - 16.5V 16.8 - 26.4V 19.6 -30.8V 32.6 - 52.8V
MAXIMUM
OUTPUT
RATINGS
(AMPS,
WATTS)
50° C amb. 20.0A/66W 20.0A/100W 8.3A/99.6W 6.6A/99W 4.2A/100.8W 3.5A/98W 2.0A/96W
60° C amb. 14.0A/46.2W 14.0A/70W 5.8A/69.7W 4.6A/69.3W 2.9A/70.6W 2.45A/68.6W 1.4A/67.2W
71° C amb. 8.0A/26.4W 8.0A/40W 3.3A/39.8W 2.6A/39.8W 1.7A/40.3W 1.4A/39.2W 0.8A/38.4W
CURRENT LIMIT (AMPS)
(1) 22.0 - 24.0 22.0 - 24.0 9.1 - 10.0 7.3 - 8.0 4.7 - 5.1 4.0 - 4.2 2.3 - 2.5
OVP RANGE (VOLTS) 3.9 - 4.8 6.0 - 6.9 13.7 - 15.7 17.0 - 19.5 27.0 - 30.5 32.0 - 35.0 55.0 - 63.0
RIPPLE
AND
NOISE
(2)
(mV p-p)
source (typ) 5 5 15 15 25 30 35
source (max) 10 10 30 30 40 60 90
switching (typ) 25 25 25 25 25 25 25
switching (max) 40 40 50 50 60 60 60
spike noise
(max)
(3)
100 100 170 200 290 330 530
(1) Change of current setting with the specified variations for operating temperatures and source input voltage is within ±10% of the rated values.
(2) Source component 2x source frequency, and switching component approximately 140KHz.
(3) Measured with a 50 MHz bandwidth.
CAUTION: UNIT IS SET
TO 115V AC OPERATION