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K Series with PFC Data Sheet
150 – 280 Watt AC-DC Converters
Functional Description
The input voltage is fed via an input fuse, an input filter, a
rectifier, and an inrush current limiter to a boost converter.
This step-up converter provides a sinusoidal input current
(IEC/EN 61000-3-2, class D equipment) and charges the
bulk capacitor C b to approx. 370 VDC. This capacitor
sources a single-transistor forward converter and provides
the power during the hold-up time.
The main transformer exhibits a separate secondary
winding for each output. Each generated voltage is
rectified and smoothed by the power choke and the output
filter. The control logic senses the main output voltage V o
or V o1 and generates, with respect to the maximum
admissible output currents, the control signal for the
switching transistor of the forward converter.
The second output of double output models is tracking to
the main output, but has its own current limiting circuit. If
the main output voltage drops due to current limitation, the
second output voltage will fall as well and vice versa.
A separate auxiliary converter generates the supply
voltages for all primary and secondary control circuits and
options.
P
03001c
16 R
N~ 28
26
1
C Y
18 i
20 D/V
22 T
12 S+
C i +
2
3
C Y
C Y
4
6
8
10
Vo+
Vo–
L~ 30
32
24
C Y
14 S–
Fig. 1
Block diagram of single-output models
1
Transient suppressor (VDR)
2
Inrush current limiter (NTC, only models with T A min = –25 °C ) or option E
3
Bulk capacitor C b ; bulk voltage approx. 370 V
P
–
+
03002c
C i +
N~ 26
28
1
C Y
3
C Y
16
18
20
22
R
i
D
T
12 Vo1+
14 Vo1–
2
4
6
Vo2+
Fig. 2
L~ 30
32
24
C Y
–
+
8
10
Vo2–
Block diagram of double-output models
1
2
3
Transient suppressor (VDR)
Inrush current limiter (NTC, only models with T A min = –25 °C ) or option E
Bulk capacitor C b ; bulk voltage approx. 370 V
BCD20001-G Rev AC, 16-Dec-2010
Page 4 of 29
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