KEPCO RCW 750W Series - Manual (Page 5)

RCW 750W 120607
1
1.0 INTRODUCTION
1.1 SCOPE OF MANUAL
This Operator's Manual covers the installation and operation of the Kepco RCW 750W Series of
Switching Power Supplies. For service information, write directly to: Kepco Inc., 131-38 Sanford
Avenue, 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 750W 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 750W Series employs a light weight ferrite core transformer with 160 KHz typical (140 KHz
typical for the RCW 48-15K model) switching frequency. The Power Factor Correction Circuit has a
typical switching of 60 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 thyris-
tor "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 aluminum case with a green LED "out-
put present" light visible on the terminal side of the case.
2.0 SPECIFICATIONS
Table 1 contains specifications and operating limits of individual RCW 750W Series models. Table
2 contains specifications and operating limits common to all RCW 750W Series Models. These
specifications are at nominal input voltages at 25°C unless otherwise specified.
TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS
MODEL RCW 750W RCW 3.3-150K RCW 5-150K RCW 12-62K RCW 15-50K RCW 24-31K RCW 28-26K RCW 48-15K
Output Volts d-c (5) 3.3V 5V 12V 15V 24V 28V 48V
Adjustment Range 2.7~3.6 4.0~5.5 8.4~13.2 12.0~16.5 16.8~26.4 22.4~30.8 32.6~52.8
Maximum
Output
Ratings
(Amps,
Watts)
50°C, amb
150.0A
495.0W
150.0A
750.0W
62.5A
750.0W
50.0A
750.0W
31.3A
751.2W
26.8A
750.4W
15.7A
753.6W
60°C, amb
105.0A
346.5W
105.0A
346.5W
43.75A
525.0W
35.0A
525.0W
21.9A
525.84W
18.76A
525.28W
11.0A
527.52W
70°C, amb
60.0A
198.0W
60.0A
300.0W
25.0A
300.0W
20.0A
300.0W
12.52A
300.48W
10.72A
300.16W
6.28A
301.44W
Current Limit (Amps) (1) 157 ~ 175 157~175 65.0~71.0 52.5~58.5 32.8~36.0 28.1~30.8 16.4~18.1
OVP Settings (Volts) (2) 3.8 ~ 4.6 6.0~6.9 13.7~15.7 17.0~19.5 27.0~30.5 31.4~34.5 54.0~59.0
Efficiency
% typ
AC Input
120V
71 76 77 78 79 80 82
AC Input
240V
73 79 80 81 82 84 85
source(max) 20 20 20 20 20 20 20
Ripple &
Noise
(3)
(mV, p-p)
switching
(max)
50 50 80 80 120 120 200
spike noise
(max)
(4)
200 200 250 250 300 300 500
Transient
Recovery
(6)
Excursion
±V typ
1.0 1.0 0.5 0.5 0.5 0.5 0.15
Rec’y to
within 1%
(<µs)
100 100 75 75 50 50 500
1) The Power Supply has a square type overcurrent characteristic, shutdown by undervoltage detection.
2) The Power Supply has a shut-down type overvoltage characteristic. Recovery time to reset 40 seconds minimum.
3) Source component 2x source frequency and switching component approximately 160 KHz, 10 to 100% load and ambient Ta = 25°C.
4) Measure with a 50MHz bandwidth, 10 to 100% load and ambient Ta= 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
≥
15 µs, 12V
≥
6.25 µs,
15V
≥
5 µs, 24V
≥
3.13 µs, 28V
≥
2.68 µs, 48V
≥
7.85 µs