U211B3 Temic Semiconductors (acquired by ATMEL Corporation), U211B3 Datasheet - Page 6

• Manufacturer Part Number: U211B3
• Description: Phase Control Circuit - General Purpose Feedback
• Manufacturer: Temic Semiconductors (acquired by ATMEL Corporation)

Design Hints
Practical trials are normally needed for the exact
determination of the values of the relevant components in
the load limiting. To make this evaluation easier, the
P
P
t
t
n.e
Pulse Output Stage
The pulse output stage is short circuit protected and can
typically deliver currents of 125 mA. For the design of
smaller triggering currents, the function I
been given in the data sheets in the appendix.
Automatic Retriggering
The variable automatic retriggering prevents half cycles
without current flow, even if the triac is turned off earlier
e.g. due to a collector which is not exactly centered (brush
lifter) or in the event of unsuccessful triggering. If it is
necessary, another triggering pulse is generated after a
time lapse which is determined by the repetition rate set
by resistance between Pin 5 and Pin 3 (R
maximum repetition rate (Pin 5 directly connected to
Pin 3), the next attempt to trigger comes after a pause of
4.5 t
half-cycle finishes. If Pin 5 is connected, then only one
trigger pulse per half-cycle is generated. Because the
value of R
repetition rate set using R
of C
U211B2/ B3
P
P
P
t
t
d
r
6 (20)
max
min
d
r
max
min
max
2
p
.
and this is repeated until either the triac fires or the
/
– maximum continuous power dissipation
– power dissipation with no rotation
– operation delay time
– recovery time
– no effect
min
Parameters
5-3
determines the charging current of C
5-3
is only valid for a fixed value
R
increases
increases
increases
n.e.
n.e.
10
GT
5-3
= f(R
). With the
GT
2
, any
) has
P
P
1
1
R
decreases
decreases
n.e.
decreases
increases
= f
= f
following table shows the effect of the circuitry on the
important parameters of the load limiting and summarises
the general tendencies.
General Hints and Explanation of Terms
To ensure safe and trouble-free operation, the following
points should be taken into consideration when circuits
are being constructed or in the design of printed circuit
boards.
– The connecting lines from C
– The common (earth) connections of the set-point
– The tacho-generator should be mounted without
– The connections from R
To achieve a high noise immunity, a maximum ramp
voltage of 6 V should be used.
The typical resistance R
follows:
A 10% lower value of R
is recommended.
9
(n)
(n)
Component affected
should be as short as possible: The connection to Pin 2
should not carry any additional high current such as
the load current. When selecting C
temperature coefficient is desirable.
generator,
interference suppression capacitor C
converter should not carry load current.
influence by strong stray fields from the motor.
as possible.
R ö (k
n
n = 0
0
T = Period duration for mains frequency
C
ö
0
W
= Ramp capacitor, max. ramp voltage 6 V
)
(10 ms at 50 Hz)
and constant voltage drop at R
+
the
T(ms)
tacho-generator
TELEFUNKEN Semiconductors
C nF)
ö
ö
(under worst case conditions)
can be calculated from I
10
C
n.e.
n.e.
n.e.
increases
increases
1.13(V)
9
and C
6(V)
2
Rev. A1, 29-May-96
5
to Pin 7 and Pin 2
should be as short
and
10
4
3
ö
of the f/V
2
= 1.13 V.
the
, a low
final
ö
as