KEPCO RKW 300W Series Operator Manual - Manual (Page 3)

RKW 300W 060110
1
1. INTRODUCTION
1.1 SCOPE OF MANUAL
This Operator's Manual covers the installation and operation of the Kepco RKW 300W Series of
PFC (Power Factor Corrected), RoHS (Reduction of Hazardous Substances) compliant, 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
RKW Power Supply. This information can be found on the nameplate of the unit.
1.2 DESCRIPTION
The Kepco RKW 300W Series consists of seven models of switching power supplies, each with a
single output as shown in Table 1. Units may be operated with a nominal 100V a-c to 240V a-c
(input voltage range 85 to 265 Va-c), 50-60 Hz (input frequency range 47-66Hz). They will also
operate on 110V to 370V d-c input. The RKW 300W Series employs a light weight ferrite core with
200 KHz switching frequency. Regulation is provided by pulse width modulation. A power stage
with a MOSFET on each side of the primary winding, operating in the forward mode provides a
smooth isolated d-c output. A thyristor circuit prevents excessive turn-on current surge. Overvolt-
age, overtemperature, fan failure and power failure protections and an isolated remote TTL ON-
OFF control are provided. An LED “output voltage ON” light and an output voltage adjust trimmer
are visible near the output terminals (upper right side of the front panel). Units are manufactured
on a steel frame with a steel cover.
2. SPECIFICATIONS
Table 1 contains specifications and operating limits of individual RKW 300W Series models. Table
2 contains specifications and operating limits common to all RKW 300W Series Models. These
specifications are at nominal input voltages at 25°C unless otherwise specified.
TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS
MODEL RKW 300W 3.3-70K 5-60K 12-27K 15-22K 24-14K 28-12K 48-7K
Output Volts d-c 3.3V 5V 12V 15V 24V 28V 48V
Adjustment Range 1.8-3.6 3.5-6.0 7.2-14.4 10.5-18.0 16.8-28.8 19.6-33.6 33.6-52.8
Voltage Setting 3.3 ±0.03 5 ±0.05 12 ±0.12 15 ±0.15 24 ±0.24 28 ±0.28 48 ±0.48
–10°C
to 40°C
Amps 70 60 27 22 14 12 7
Watts 231 300 324 330 336 336 336
Maximum
Output
Ratings
(A,W)
50°C
amb
Amps 61.6 60 27 22 14 12 7
Watts 203.3 300 324 330 336 336 336
56°C
amb
Amps 56 52.8 23.8 19.4 12.3 10.6 6.2
Watts 184.8 264 285.1 290.4 295.7 295.7 295.7
60°C,
amb
Amps 52.6 48 21.6 17.6 11.2 9.6 5.6
Watts 173.7 240 259.2 264 268.8 268.8 268.8
65°C,
amb
Amps 49 42 18.9 15.4 9.8 8.4 4.9
Watts 161.7 210 226.8 231 235.2 235.2 235.2
Overcurrent Setting (Amps) (1) 73.5 - 91 63 - 78 28.4 - 35.1 23.1 - 28.6 14.7 - 18.2 12.6 - 15.6 7.4 - 9.1
Current Short Circuit 90 82 35 29 20 17 11
OVP Setting (Volts) (2) 4.0 - 4.6 6.2 - 7.0 14.8 - 16.8 18.6 - 21.0 29.8 - 33.6 34.7 - 39.2 55.0 - 59.9
Efficiency
% typical
AC Input 100V 68 74 76 77 80 80 81
AC Input 200V 72 78 80 81 84 84 85
Ripple &
Noise (3)
(mV, p-p)
ripple 80 80 120 120 150 150 200
ripple noise 120 120 150 150 200 200 300
(1) Square type. If overcurrent condition continues beyond 30 seconds, the output is shut OFF. Recovery is by removing
power and reapplying power after about 40 seconds or by opening and reclosing the RC terminals .
(2) When overvoltage is detected, output is shut OFF. Recovery is by removing power and reapplying power after about
40 seconds or by opening and reclosing the RC terminals (no delay).
(3) Ripple and noise specifications are 1.5 times indicated values for temperature range of -10 to 0°C. Ripple and noise
levels above are satisfied when conditions are 0 to 100% load, 0 to 65°C (derated from 50 to 65°C per Figure 2, der-
ated from 40 to 65°C for 3.3V model), and bandwidth
≤ 100MHz.