U211B2
| Model | U211B2 |
| Description | Phase Control Circuit - General Purpose Feedback |
| PDF file | Total 20 pages (File size: 321K) |
| Chip Manufacturer | TEMIC |
U211B2/ B3
95 10716
V
Mains
Supply
p
/2
p
3/2
p
2
p
V
GT
Trigger
Pulse
V
L
Load
Voltage
t
p
t
pp
= 4.5 t
p
I
L
Load
Current
ö
F
Figure 6. Explanation of terms in phase relationship
Design Calculations for Mains Supply
The following equations can be used for the evaluation of the series resistor R
1
for worst case conditions:
R
1max
+
0.85 V
+
Mmin
– V
Smax
2 I
tot
R
1min
+
V 2 –I V
M
Smin
Smax
P
(R1max)
where:
(V
Mmax
– V
Smin
)
2
2 R
1
= Mains voltage
V
S
= Supply voltage on Pin 3
= Total DC current requirement of the circuit
I
tot
= I
S
+ I
p
+ I
x
I
Smax
= Current requirement of the IC in mA
I
p
= Average current requirement of the triggering pulse
= Current requirement of other peripheral components
I
x
R
1
can be easily evaluated from the figures 20 to 22.
V
M
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
7 (20)
