KEPCO RCW 350W Series - Manual (Page 3)

RCW350W 120607
1
1.0 INTRODUCTION
1.1 SCOPE OF MANUAL
This Operator's Manual covers the installation and operation of the Kepco RCW 350W Series of
Switching Power Supplies. For service information, write directly to: Kepco Inc., 131-38 Sanford Ave-
nue, Flushing, New York, 11355, U.S.A. Please state Model Designation and Serial Number of your
RCW Power Supply. This information can be found on the nameplate of the unit.
1.2 DESCRIPTION
The Kepco RCW 350W Series consists of seven models of Switching Power Supplies, with a single
output as shown in Table 1. RCW power supplies are compliant with the Low Voltage Directive (LVD)
and carry the CE Mark. Units are designed to operate with a universal input voltage within the range of 85
to 264V AC and may be operated with either 100-120V AC, or 200-240V AC (100 to 240 volts nominal
input range), 50-60 Hz (47-66 Hz) input. They will also operate on 125V to 370V dc input. The RCW
350W Series employs a light weight ferrite core transformer with 150 KHz typical switching frequency.
The Power Factor Correction Circuit has a typical switching of 120 KHz. Regulation is provided by
pulse width modulation. A FET power stage, operating in the forward conversion mode provides a
smooth isolated dc output. A resistor and thyristor "soft-start" circuit prevents excessive turn-on current
surge. Overvoltage protection and optically isolated remote TTL ON-OFF control are provided. Current
limiting with automatic recovery from short circuit is featured. Units are enclosed in a wrap-around alu-
minum case with a green LED "output present" light visible on the terminal side of the case.
2.0 SPECIFICATIONS
Table 1 contains specifications and operating limits of individual RCW 350W Series models. Table 2
contains specifications and operating limits common to all RCW 350W Series Models. These specifica-
tions are at nominal input voltages at 25°C unless otherwise specified.
TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS
MODEL RCW 350W 3.3-70K 5-70K 12-30K 15-24K 24-16K 28-13K 48-7.5K
Output Volts d-c (5) 3.3V 5V 12V 15V 24V 28V 48V
Adjustment Range (7) 1.8-3.5 3.5-5.5 8.4-13.2 12-16.5 16.5-26.4 25.2-30.8 30.8-52.8
Maximum
Output
Ratings
(A,W)
50°C
amb
Amps 70 70 30 24 16 13 7.5
Watts 245 350 360 360 384 364 360
60°C,
amb
Amps 49 49 21 16.8 11.2 9.1 5.25
Watts 171.5 245 252 252 268.8 254.8 252
70°C,
amb
Amps 28 28 12 9.6 6.4 5.2 3.0
Watts 98 140 144 144 153.6 145.6 144
Current Limit (Amps) (1) 73-84 73-84 31.5-36 25.2-28.8 16.8-19.2 13.6-15.6 7.8-9.0
OVP Settings (Volts) (2) 3.96-4.62 6.0-7.0 13.2-15.6 16.5-19.5 26.4-31.2 30.8-36.4
49.44-
59.04
Efficiency
% typical
AC Input 120V 65 72 73 75 76 77 79
AC Input 240V 68 76 77 78 79 80 82
Ripple &
Noise
(3)
(mV, p-p)
source (max) 50 50 70 70 100 100 100
spike noise (max) (4) 100 100 150 150 200 200 300
Transient
Recovery (6)
Recovery to 1%
(
1 1 1 1 1 1 1
Excursion ±Vmax 0.5 0.5 0.5 0.5 0.15 0.15 0.15
1) The Power Supply has a square type overcurrent characteristic, shutdown by undervoltage detection
2) The Power Supply has a shut-down type (by tracking) overvoltage characteristic. Recovery time to reset 40 seconds minimum
3) Source component 2x source frequency and switching component approximately 150 KHz, 10 to 100% load and ambient Ta = 25°C
4) Measure with a 50MHz bandwidth, 10 to 100% load and ambient Tc= 25°C
5) Output voltage setting = ±1%
6) A step load change from 50% to 100% of rated load current (with the following tr, tf load changes) produces no more than the output
voltage excursions listed in the above table. tr, tf of load change : 3.3v and 5v>7µs, 12v>3µs, 15v>2.4µs, 24v>8µs, 28v>6.5µs,
48v>3.5µs, .
7) Recommended (using internal adjustment pot, par. 3.4). Using external pot (par.3.5) range = 10% to 110% of rated output voltage.