where
VM
VS
Itot
IS
Ix
P(R1)
= Mains voltage
= Limiting voltage of the IC
= Total current consumption
= Current requirement of the IC (without load)
= Current requirement of other peripheral components
= Power dissipation at R1
Figure 7. Maximum Resistance of R1
50
40
VMains = 230 V~
30
20
10
0
0
3
6
9
Itot (mA)
12
15
Figure 8. Power Dissipation of R1 According to Current Consumption
6
5
VMains = 230 V ~
4
3
2
1
0
0
3
6
9
Itot (mA)
12
15
6 T2117
4768A–INDCO–11/03