LS4899-7B1 Ver la hoja de datos (PDF) - Power-One Inc.
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LS4899-7B1 Datasheet PDF : 27 Pages
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Cassette Style
100 Watt AC-DC Converters
S Series PFC
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
N∼
26
28
Y
1
3
2
Ci
+
4
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
Y
03001
16 R
18 i
20 D/V
22 T
12 S+
4
6 Vo+
8
Y
Vo–
10
P~
30
32
Y
24
14 S–
Fig. 1
Block diagram of single output converters LS 4000
N~ 26
Y
28
1
3
P~
30
32
24
2
Y
Ci
+
4
P
Y
YY
Y
–+
03002
16 R
18 i
20 D
22 T
12 Vo1+
14 Vo1–
4
6 Vo2+
8
10 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
–+
Edition 01/01.2001
3/27
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