KEPCO MTW 15 User Manual

INSTRUCTION MANUAL

KEPCO

An ISO 9001 Company.

MTW

15 WATT TRIPLE OUTPUT

SWITCHING POWER SUPPLY

I — INTRODUCTION

SCOPE OF MANUAL. This instruction manual covers the installation and operation of the Kepco MTW 15W Switching Power Supply,

Model MTW 15-51212K.

DESCRIPTION. The Kepco MTW 15W 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 15W employs a light weight ferrite core with 30-250 KHz switching frequency. Regulation is provided by
pulse width modulation. Integral regulator chips provide smooth isolated d-c outputs. A trimmer provides fine adjustment of the 5V output. The
±12V outputs have a common return. DC Output power is shared between +5V, +12V and -12V (15W 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 39) 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.

TABLE 1. MTW 15W OUTPUT SPECIFICATIONS

SPECIFICATION

OUTPUT VOLTS, d-c

SETTING TOLERANCE (V)

ADJUSTMENT RANGE

OUTPUT

CURRENT

(A)

SOURCE EFFECT

LOAD EFFECT

TEMPERATURE EFFECT

COMBINED EFFECT

TIME EFFECT (Drift)

OVERCURRENT (AMPS)

OVERVOLTAGE SETTING (VOLTS)

EFFICIENCY (typ.)

ACCEPTABLE OUTPUT CAP. (µFmax.)

RIPPLE

AND

(1)

NOISE

(mV p-p)

(1) Switching component ≤ 20KHz, 0 to 100% load, 0 to 60

°C, tested with 100µF electrolytic and 0.1µF film capaci­tors across the load and connected to the power supply
via 5.9 in (150mm) wires.

(2) Fold back method; automatic recovery after cause of

overcurrent is removed. Avoid overcurrent operation to
prevent component degradation.

RATED

MINIMUM

(4)

PEAK

(2)

(3)

100 Va-c
240 Va-c

ripple (typ)

ripple (-10-0ªC)

spike noise (typ)

spike noise (-10-0ªC)

INPUT VOLTAGE:

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).

OUTPUT 1 OUTPUT 2 OUTPUT 3 CONDITON

5V +12 –12V +5V floating from ±12V

4.9-5.1

5.00-5.25

0.4% max. 0.4% max. 0.4% max. 85-132Va-c, 170-265Va-c

(5)

2.0 0.3 0.2
0 0 0

3.0 0.6 0.3 Within 10 seconds.

2% max. 1% max. 1% max. 10-100% load
1% max. 1% max. 1% max. -10 to 50°C
2% max. 2% max. 2% max. Overshoot at startup: 4% typ.
2% max. 1% max. 1% max. 1/2 to 8 hr.

3.15 min. 0.63 min. 0.32 min.

5.7 min. - ­71% 71% 71%
70% 70% 70%

10000 5000 -

100 120 120

140 max. 160 max. 160 max.

120 150 150

160 max. 180 max. 180 max.

11.4-12.6 11.4-12.6
FIXED FIXED

(3) Zener diode clamp method; protects load against faulty power supply;

operation could require power supply service.

(4) Peak current acceptable as long as rms output current within 10 seconds is

within rated value.

(5) Adjustable using 5V Output Voltage Adjustment trimpot.

15W

Fixed load resistance

KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11355 U.S.A. " TEL [phone] " FAX [phone]

©2008, KEPCO, INC 1
Data subject to change without notice 228-1548 REV 2

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INPUT CURRENT: (maximum load at 25°C with nominal output voltage):

0.42A typ. (100 Va-c input, 100% load); 0.25A typ. (240 Va-c input, 100% load)

INPUT PROTECTION AND SOFT START: A thermistor circuit reduces start-up surge. Units are protected against shorts by an input

fuse. Fuse value 2A, 250V.

INPUT SURGE: First surge only, not including current flow into EMI filter.

25A typ. (100 V a-c, 100% load, 25°C cold start); 50A typ. (240 Va-c, 100% load, 25°C cold start)

LEAKAGE CURRENT:

0.75mA max, 0.2mA typ at 100V a-c (60Hz single pole switching) in conformance to DENAN .

0.75mA max, 0.3mA typ at 240V d-c (60Hz single pole switching in conformance to UL 60950/IEC 60950-1)

POWER FACTOR: 0.55 typ. at 100 Va-c, 0.45 typ. at 240 Va-c

TRANSIENT RECOVERY: A step load change from 50% to 100% of rated load in 50 microseconds or more, produces no more than

4% output voltage excursion. Temperature range from -10 to 60°C.

OUTPUT HOLDING TIME: Upon input interruption the output is maintained for 150 milliseconds typical with 240 Va-c input voltage,

and for 20 milliseconds typical with 100 Va-c input voltage. The condition for output load is 100%.

START UP TIME: 100mS max. (+5V, ±12V) at 100 Va-c, Output voltage may not rise with constant current load. .

OVERVOLTAGE PROTECTION: Fixed, factory set. See Table 1. The overvoltage circuit is set by Zener diode clamp.

OVERCURRENT: Hold back method, output voltage returns to rated level upon removal of cause (long term overcurrent could damage

unit)

OPERATING TEMPERATURE: -10 to 60°C (start up -20 to -10°C). See the derating

plot, Figure 1. Do not allow the power supply to become dust covered because that will
decrease the cooling efficiency of the unit and cause insulation to deteriorate.

STORAGE TEMPERATURE: -30°C to + 75°C.

COOLING: Natural convection

ORIENTATION: Horizontal (see Figure 2).

HUMIDITY: 10% to 90% relative humidity, operating and storage, noncondensing,

wet bulb temperature ≤35°C

WITHSTANDING VOLTAGE:

(at 5 to 35°C ambient, 45 to 85% relative humidity, cutout current 10 ma):
Between input and output terminals, 3.0 KV a-c for 1 minute.
Between input and chassis, 2000V a-c for 1 minute.
Between output terminals and chassis, 500V a-c for 1 minute.

INSULATION RESISTANCE: (500V d-c, 5 to 35°C ambient, 45 to 85% relative

humidity) Between input and output, input and chassis, and output and
chassis:100 megohms minimum.

VIBRATION: Three axes, one hour each, sweep time 10 min:, nonoperating

2

5-10 Hz., 10 mm amplitude;10-200 Hz., 2G (19.6m/s

SHOCK: Three axes, 60G (588m/s

axis, nonoperating, 1/2 sine pulse

2

), 11 ms ±5msec pulse duration, three shocks each

) acceleration

FIGURE 1. DERATING PLOT

SAFETY: Meets UL 60950-1.c-UL and TÜV Rheinland EN60950-1 (ambient temp. 50°C max,). Meets creepage and clearance require-

ments of DENAN Appendix 8 (at 100V a-c only). MTW 15W units are CE marked per the Low Voltage Directive (LVD), EN60950. [The
standards do not apply with DC input operation]

EMC - EMISSIONS:

Conducted Noise 0.15MHz to 30MHz: FCC Class B, VCCI-B, EN55011-B, EN55022-B

EMC - IMMUNITY:

ESD: EN 61000-4-2 Level 4, Normal operation.
Radiated Field Noise: EN 61000-4-3 Level 3, Normal operation.
Electrical Fast Transient/Burst (EFT): EN 61000-4-4 Level 3, Normal operation.
Surge: EN 61000-4-5 Level 4, no damage.
Conducted Noise: EN 61000-4-6 Level 3, Normal operation.
Power Frequency Magnetic Field: EN 61000-4-8 Level 4, Normal operation.
Voltage Dips, Short Interruptions, Voltage Variation: EN 61000-4-11, Normal operation.

ELECTROLYTIC CAPACITOR: Life expectancy: 10,000 hours min. (ambient temp. 50°C)

WARRANTY: One year.

III — INSTALLATION

MOUNTING THE POWER SUPPLY: Refer to Figures 2, 3 and 4. The unit may be mounted on one mounting surface. The air sur-

rounding the power supply must not exceed the ambient temperature values given in the graph in Figure 1.

KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11355 U.S.A. " TEL [phone] " FAX [phone]

http://www.kepcopower.com " email: [e-mail]

2 228-1548 REV 2 031908