U2010B
| Model | U2010B |
| Description | Phase Control Circuit for Current Feedback |
| PDF file | Total 12 pages (File size: 204K) |
| Chip Manufacturer | TEMIC |
increases to 8 V. Resistance, R
sync.
defines the width of
the zero voltage cross over pulse, synchronization
current, and hence the mains supply voltage
compensation current.
Mains
96 11648
Load Current Limitation
The total output load current is available at Pin 6. It
results in a voltage drop across R
11
. When the potential
of the load current reaches about 70% of the threshold
value (V
T70
) i.e., ca. 4.35 V at Pin 6, it switches the high
load comparator and opens the switch between Pins 11
and 12. By using an LED between these pins, (11 and 12)
a high load indication can be realized.
If the potential at Pin 6 increases to ca. 6.2 V (= V
T100
),
it switches the overload comparator. The result is
programmable at Pin 9 (operation mode).
Mode selection:
a)
α
max
(V
9
= 0)
In this mode of operation, after V
6
has reached the
threshold V
T100
, Pin 13 switches to –V
S
(Pin 11) and
Pin 6 to GND (Pin 10). A soft-start capacitor is then
shorted and the control angle is switched to
α
max
.
This position is maintained until the supply voltage
is switched off. The motor can be started again with
soft-start function when the power is switched on
again. As the overload condition switches Pin 13 to
Pin 11, it is possible to set in a smaller control angle,
α
max
, by connecting a further resistance between
Pins 13 and 14.
R
2
15
2x
BZX55
C6V2
U2010B
10
Figure 3.
4 (12)
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96
