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| U209B3 Datasheet, PDF (13/14 Pages) TEMIC Semiconductors – Phase Control Circuit - Tacho Applications | |||
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U209B3/U209B3âFP
TELEFUNKEN Semiconductors
Design Calculations for Mains Supply
The following equations can be used for the evaluation of the series resistor R1 for worst case conditions:
VMmin â VSmax
R1max = 0.85
2 Itot
(VMmax â VSmin)2
P(R1max) =
2 R1
VM â VSmin
R1min = 0.85
2 ISmax
where:
VM
= Mains voltage 220 V
VS
= Supply voltage on Pin 4
Itot
= Total DC current requirement of the circuit
= IS + Ip + Ix
ISmax = Current requirement of the IC in mA
Ip
= Average current requirement of the triggering pulse
Ix
= Current requirement of other peripheral components
R1 can be easily evaluated from diagram figure 16 and 17
Dimensions in mm
94 9445
14 (15)
94 8875
Preliminary Information
Rev. A1: 31.09.1995
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