KEPCO MTW 30 - Manual

©2008, KEPCO, INC 1
Data subject to change without notice 228-1547 REV 3
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
30W
30 WATT TRIPLE OUTPUT
SWITCHING POWER SUPPLY
I — INTRODUCTION
SCOPE OF MANUAL. This instruction manual covers the installation and operation of the Kepco MTW 30W Switching Power Supply,
Model MTW 30-51212K.
DESCRIPTION. The Kepco MTW 30W 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 30W employs a light weight ferrite core with 70 KHz switching frequency. Regulation is provided by pulse
width modulation. A trimmer provides fine adjustment of the 5V output. A FET power stage, operating in the flyback mode provides smooth iso-
lated d-c outputs. DC Output power is shared between +5V, +12V and -12V (30W max. total). A thermistor circuit prevents excessive turn-on
current surge. Overvoltage protection is provided. Overcurrent protection with automatic recovery from short circuit is featured. A steel cover
(Model CA 40) 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 30W 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 to 5.1 11.4 to 12.6 -11.4 to -12.6
ADJUSTMENT RANGE 5.00 to 5.25 (7) FIXED FIXED
OUTPUT
CURRENT
(A)
RATED 3.0 1.2 0.3
MINIMUM
(5) 0.5 0 0
PEAK
(6) 4.5 2.0 0.45 Within 10 seconds.
SOURCE EFFECT 1% max. 0.4% max. 0.4% max. 85-132Va-c, 170-265Va-c
LOAD EFFECT 2% max. 1% max. 1% max. 10-100% load
TEMPERATURE EFFECT 2% max. 1% max. 1% max. -10 to 50°C
COMBINED EFFECT 3% max. 2% 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) 4.7 min. 2.1 min. 0.48 min.
OVERVOLTAGE SETTING (VOLTS)
(3) 5.8 min. - -
EFFICIENCY (typ.)
100 Va-c 76% 76% 76%
240 Va-c 77% 77% 77%
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) For +5V output current from 0 to 0.5A, ±12V output current is 80% of rated
value.
(6) Peak current acceptable as long as rms output current within 10 seconds is
within rated value.
(7) Adjustable using 5V Output Voltage Adjustment trimpot.