©2012, KEPCO, INC
1
Data subject to change without notice
228-1546 REV 4
I N S T R U C T I O N M A N U A L
KEPCO
KEPCO, INC.
131-38 SANFORD AVENUE
FLUSHING, NY. 11355 U.S.A.
TEL (718) 461-7000
FAX (718) 767-1102
http://www.kepcopower.com
email: [email protected]
An ISO 9001 Company.
MTW
60W
60 WATT TRIPLE OUTPUT
SWITCHING POWER SUPPLY
I — INTRODUCTION
SCOPE OF MANUAL.
This instruction manual covers the installation and operation of the Kepco MTW 60W Switching Power Supply,
Model MTW 60-51212K.
DESCRIPTION.
The Kepco MTW 60W is a PC card style, triple-output switching power supply. Units may be operated with a nominal 100 to
120V a-c and 220 to 240V a-c (input voltage range 85 to 265 Va-c), 50-60 Hz (input frequency range 47-440Hz). They will also operate on
110V to 370V d-c input. The MTW 60W employs a light weight ferrite core with 70 KHz switching frequency for the +5V output and 100KHz for
the ±12V outputs. Regulation is provided by pulse width modulation. A FET power stage, operating in the flyback mode provides smooth iso-
lated d-c outputs. A trimmer provides fine adjustment of the 5V output. The ±12V outputs have a common return. DC Output power is shared
b5V, +12V and -12V (60W max. total). A thermistor circuit prevents excessive turn-on current surge. Overvoltage protection is pro-
vided. Overcurrent protection with automatic recovery from short circuit is featured. A steel cover (Model CA 41) is available as an option.
Table 1 contains output specifications. Section II (following) contains specifications and operating limits.
II — SPECIFICATIONS
The following specifications are at nominal input voltages at 25°C unless otherwise specified.
INPUT VOLTAGE:
CAUTION:
Operation at voltage below specified range for more than 10 minutes may cause component degradation.
Nominal 100-120V a-c, 200-240V a-c, range: 85-265V a-c (0 to 100% load, -10 to 60°C)
d-c range: 110 -370V d-c (Safety agency approval applies only to a-c input operation.)
INPUT SOURCE FREQUENCY:
Nominal 50/60 Hz; Range 47-440 Hz. (0 to 100% load, -10 to 60°C). At 440 Hz the leakage current exceeds the VDE safety specification
limit.
TABLE 1. MTW 60W OUTPUT SPECIFICATIONS
SPECIFICATION
OUTPUT 1
OUTPUT 2
OUTPUT 3
CONDITON
OUTPUT VOLTS, d-c
5V
+12
–12V
+5V floating from ±12V
SETTING TOLERANCE (V)
4.9-5.1
11.4-12.6
11.4-12.6
ADJUSTMENT RANGE
5.00-5.25
(6)
FIXED
FIXED
OUTPUT
CURRENT
(A)
RATED
5.0
2.5
0.5
MINIMUM
0
0
0
PEAK
(5)
7.0
3.5
0.7
Within 10 seconds.
SOURCE EFFECT
1% max.
0.4% max.
0.4% max.
85-132Va-c, 170-265Va-c
LOAD EFFECT
2% max.
2% max.
1% max.
10-100% load
TEMPERATURE EFFECT
2% max.
2% max.
1% max.
-10 to 50°C
COMBINED EFFECT
2.5% max.
2.5% max.
2% max.
Overshoot at startup: 4% typ.
TIME EFFECT (Drift)
1% max.
1% max.
1% max.
1/2 to 8 hr.
OVERCURRENT (AMPS)
(2)
7.4 min.
3.7 min.
0.75 min.
OVERVOLTAGE SETTING (VOLTS)
(3)
5.8 min.
13.8 min.
-
EFFICIENCY (typ.)
100 Va-c
76%
76%
76%
240 Va-c
76%
76%
76%
ACCEPTABLE OUTPUT CAP.
(4)
(µFmax.)
10000
5000
3000
Fixed load resistance
RIPPLE
AND
NOISE
(1)
(mV p-p)
ripple (typ)
80
100
100
ripple (-10-0ªC)
140 max.
160 max.
160 max.
spike noise (typ)
120
150
150
spike noise (-10-0ªC)
160 max.
180 max.
180 max.
(1)
Switching component
≤
20KHz, 0 to 100% load, 0 to 60
°C, tested with 100µF electrolytic and 0.1µF film capaci-
tors across the load and connected to the power supply
via 5.9 in (150mm) wires.
(2)
Hiccup type; automatic recovery after cause of overcur-
rent is removed. Avoid overcurrent operation to prevent
component degradation.
(3) Zener diode clamp method; protects load against faulty power supply;
operation could require power supply service.
(4)
+5V output may drop during startup.
(5)
Peak current acceptable as long as rms output current within 10 seconds is
within rated value.
(6)
Adjustable using 5V Output Voltage Adjustment trimpot.
