LS4000 datasheet(3/27 Pages) POWER-ONE

Il numero della parte	LS4000

Spiegazioni elettronici	100 Watt AC-DC Converters with PFC

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3 / 27 page

Cassette Style

100 Watt AC-DC Converters

S Series PFC

Edition 01/01.2001

3/27

Functional Description

The input voltage is fed via an input fuse, an input ﬁlter, a

rectiﬁer and an inrush current limiter to a single transistor

boost converter. This converter provides a sinusoidal input

current (IEC/EN 61000-3-2, class D equipment) and sour-

ces a capacitor with a voltage of 360-370 V DC. This ca-

pacitor sources a single transistor forward converter.

Each output is powered by a separate secondary winding

of the main transformer. The resultant voltages are rectiﬁed

and their ripples smoothed by a power choke and an output

ﬁlter. The control logic senses the main output voltage

Uo1

and generates, with respect to the maximum admissible

output currents, the control signal for the primary switching

transistor.

The second output of double output units is controlled by

the main output, but has independent current limiting. If the

main output is driven into current limitation, the second out-

put voltage will fall as well and vice versa.

P

2

Y

16

18

20

22

12

4

6

8

10

14

Y

1

28

30

32

24

3

–

+

Y

+

Ci

4

03001

R

i

D/V

T

S+

Vo+

Vo–

S–

26

N

∼

P~

Fig. 1

Block diagram of single output converters LS 4000

1

P

2

16

18

20

22

12

14

4

6

8

10

26

28

30

32

24

3

–

+

Y

+

Ci

4

03002

N~

P~

R

i

D

T

Vo1+

Vo1–

Vo2+

Vo2–

Fig. 2

Block diagram of symmetrical double output converters LS 5000

1 Transient suppressor (VDR)

2 Inrush current limiter (NTC or Opt. E), -9 versions exclude the NTC

3 Input fuse

4 Hold-up capacitor

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