U211B3 Temic Semiconductors (acquired by ATMEL Corporation), U211B3 Datasheet - Page 7

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

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