U210B Datasheet, PDF (11/15 Pages) TEMIC Semiconductors – Phase Control Circuit - Load Current Feedback Applications

TELEFUNKEN Semiconductors
U 210 B / U 210 B–FP
Design calculations
The following equations can be used for the evaluation
of the series resistor R₁ for worst case conditions:
R_1max = 0.9 @
V_Mmin – V_Smax
2 I_tot
R_1min = ^{VMmax – VSmin}
2 I_Smax
P (R_1max) = ^{(VMmax – VSmin)2}
2 R₁
where:
V_M= Mains voltage 220 V
Vs = Supply voltage on Pin 4
I_tot = Total DC current requirement of the circuit
= I_Smax + I_p + I_x
I_Smax = Current requirement of the IC in mA
I_p = Average current requirement of the triggering pulses
I_x = Current requirement of other peripheral components
R₁ can be easily evaluated from Figures 12 – 14
Preliminary Information
11