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KEPCO RTW 150W User Manual

Rtw 150w, Kepco, I — introduction

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©2011, KEPCO, INC

1

Data subject to change without notice

228-1559 REV 7

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.

RTW

150W

150 WATT SINGLE OUTPUT, PFC,

OPEN FRAME POWER SUPPLIES

I — INTRODUCTION

SCOPE OF MANUAL.

This instruction manual covers the installation and operation of the Kepco RTW 150W Series of Open Frame PFC

(Power Factor Corrected) RoHS (Reduction of Hazardous Substances) compliant Switching Power Supplies.

DESCRIPTION.

The Kepco RTW 150W Series consists of seven models of switching power supplies, with a single output as shown in Table

1. Units may be operated with a nominal 100 to 120V a-c and 200 to 240V a-c (input voltage range 85 to 265 Va-c), 50-60 Hz (input frequency

range 47-66Hz; units operate up to 440Hz although leakage current, power factor and efficiency specifications may not be met). They will also

operate on 120V to 370V d-c input. The RTW 150W Series employs a forward converter with a fixed switching frequency of 145KHz. Power

Factor Correction (PFC) is provided by a boost converter. Regulation is provided by pulse width modulation. A thermistor circuit prevents

excessive turn-on current surge. Remote on-off and remote programming of output voltage using an external resistance can be implemented.

Overvoltage, overcurrent and overtemperature protection is provided. Current limiting with automatic recovery from short circuit is featured.

Units are convection cooled L-chassis construction. Models with a factory-installed steel cover are indicated by a C suffix following the model

number (e.g., RTW 5-30KC).
Section II contains specifications and operating limits of individual RTW 150W Series models (Table 1) as well as specifications and operating

limits common to all RTW 150W Series Models. Section III describes installation and Section IV describes operation

II — SPECIFICATIONS

The following specifications are at rated input voltages at 25°C unless otherwise specified.

INPUT VOLTAGE:

Operation at input voltage outside the recommended range may result in component degradation.

Nominal 100-120V a-c, 200-240V a-c, range: 85-265V a-c (0 to 100% load, -10 to 71°C).

d-c range: 120 -370V d-c.; polarity insensitive. 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 71°C). (Units operate up to 440 Hz, however the leakage current exceeds the

UL leakage safety specification limit, and power factor and efficiency specifications may not be met.)

INPUT CURRENT:

5V-48V models: 1.9A rms max. (100-120 Va-c input, 100% load); 1.0A rms max. (200-240 Va-c input, 100% load).

24V model at peak output: 2.7A rms typ. (100 Va-c input); 1.1A rms typ. (240 Va-c input).

3.3V model: 1.6 rms max. (100-120 Va-c input, 100% load); 0.85A rms max. (200-240 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 5A, 250V.

TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, RTW 150W SERIES

MODEL

(8)

RTW 3.3-35K

RTW 5-30K

RTW 12-12K

RTW 15-10K

RTW 24-6.3K

RTW 28-5.4K

RTW 48-3.2K

OUTPUT VOLTAGE SETTING, d-c

3.3 ±0.03V

5 ±0.05V

12 ±0.12V

15 ±0.15V

24 ±0.24V

28 ±0.28V

48 ±0.48V

ADJUSTMENT RANGE, Vd-c

2.85-4.0

4.0-5.8

9.6-13.2

12-16.5

19.2-26.4

22.4-30.8

38.4-52.8

OUTPUT CURRENT, MAX (AMPS)

35

30

12.5

10

6.3

(5)

5.4

3.2

OUTPUT POWER, MAX

(3)

(WATTS)

115.5

150.0

150.0

150.0

151.2

151.2

153.6

OVP SETTING

(1)

(VOLTS)

4.2-5.2

6.0-6.9

13.7-15.7

17.0-19.0

27.0-30.5

32.0-35.0

55.0-60.0

OVERCURRENT SETTING

(2)

(AMPERES)

38.5-45.5

33.0-39.0

13.7-16.3

11.0-13.0

10.5-13.5

5.94-7.02

3.52-4.16

EFFICIENCY

100 Va-c

80%

83%

84%

84%

86%

86%

86%

200 Va-c

83%

86%

87%

87%

88%

88%

89%

RIPPLE

AND

NOISE

(mV p-p(4))

Switching ripple (typ)

80

80

100

100

150

150

200

spike noise (typ)

(6)

120

120

150

150

200

200

300

External Potentiometer

(7)

500 Ohms

500 Ohms

750 Ohms

1K Ohms

1.5K Ohms

2K Ohms

5K Ohms

(1) Overtemperature or overvoltage shuts down the output. Recover

by recycling a-c input (30 second delay required before resetting).

(2) Hiccup mode operation. After the cause of overcurrent is

removed, output voltage recovers automatically.

(3) See Figure 1 for temperature and input voltage rating.
(4) Bandwidth 100MHz.
(5) Peak current: 10A (useful for motor start applications). Thermal

protection (24V model only) cuts off output voltage if overtempera-
ture detected; after sufficient cooling; recover by cycling a-c input.

(6) Ripple and noise will be approximately 1.5 times these values in the operating

temperature range -10 ~ 0°C. The ripple and noise values tabulated are valid
when the output is derated as shown in Figure 1 from 40 ~ 71°C.

(7) Used for remote programming of output voltage. See Section IV OPERATION,

REMOTE VOLTAGE PROGRAMMING.

(8) Specifications apply to models with K (no cover) and KC (cover installed) suf-

fixes.