LS4000 datasheet(22/27 Pages) POWER-ONE

22 / 27 page

Cassette Style

100 Watt AC-DC Converters

S Series PFC

Edition 01/01.2001

22/27

Fig. 34

Paralleling of single output units using option T with the

sense lines connected at the load

Load

max. 5 units in parallel connection

–

Power bus

Module

Vo2–

Vo2+

Vo1–

Vo1+

Module

Vo2–

Vo2+

Vo1–

Vo1+

11037

Load

LS 4000

S+

Vo+

Vo–

S–

LS 4000

S+

Vo+

Vo–

S–

max. 5 units connected in parallel

11011

1 Leads should have equal length and cross sections and should

run in the same cable loom.

2 Diodes recommended in redundant operation only

3 DC common point

Fig. 35

Paralleling of double output units using option T with

Power bus.

E Inrush Current Limitation

The converters may be supplemented by an electronic cir-

cuit (option E, replacing the standard built-in NTC) to

achieve an enhanced inrush current limiting function.

Table 17: Inrush current characteristics with option E

Characteristics

Unit

Ui = 230 V AC

typ

max

Iinr p

Peak inrush current

–

25.3

tinr

Inrush current duration

Ii [A]

–5

–10

t [ms]

tinr

Capacitor

fully charged

Normal operation

(FET fully conducting)

11002

Fig. 32

Inrush current with option E, Ui = 230 V AC, Po = Po nom

Precaution:

Subsequent switch-on cycles at start-up are limited to

max. 10 cycles during the ﬁrst 20 seconds (cold unit)

and at continuing on/off (

TC =95°C) max. 1 cycle every

8sec.

Vo+

Vo–

Vo+

Vo–

Load

Vo+

Vo–

11003

Control

FET

Rectifier

Fig. 31

Option E block diagram

T Current Sharing

This option ensures that the output currents are approxi-

mately shared between all paralleled modules and in-

creases system reliability. To use this facility, simply inter-

connect the T pins of all modules and make sure, that

pin 14, the S– pin (S 4000) or the Vo1– pins (S 5000) are

also connected together. The load leads should have equal

length and cross section to ensure equal voltage drops. Not

more than 5 units should be connected in parallel. If output

voltage adjustment is requested we strongly recommend to

use the R-input instead of option P, as with option P the re-

quired setting accuracy is difﬁcult to achieve. The output

voltages must be individually set prior to paralleling to

within a tolerance of 1...2% or the R pins should be con-

nected together.

Fig. 33

An example of poor wiring for connection in parallel

LS4000 Datasheet(PDF) 22 Page - Power-One

LS4000 Datasheet(HTML) 22 Page - Power-One

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Datasheet Download

Link URL