U211B Просмотр технического описания (PDF) - Atmel Corporation

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U211B

Phase Control IC with Overload Limitation for Tacho Applications

Atmel Corporation 

U211B

7.8 Design Calculations for Main Supply

The following equations can be used for the evaluation of the series resistor R1 for worst case

conditions:

R1max

=

0.85

-V----M----m----i-n----–----V-----S---m----a---x

2 Itot

R1min

=

V-----M-----–-----V----S---m----i-n-

2 ISmax

P ( R1max )

=

(---V----M----m----a---x----–----V----S----m----i-n---)--2-

2 R1

where:

VM

VS

Itot

ISmax

Ip

Ix

= Mains voltage

= Supply voltage on pin 3

= Total DC current requirement of the circuit

= IS + Ip + Ix

= Current requirement of the IC in mA

= Average current requirement of the triggering pulse

= Current requirement of other peripheral components

R1 can be easily evaluated from the Figure 10-14 on page 19, Figure 10-15 on page 19 and

Figure 10-16 on page 20.

11

4752B–INDCO–09/05

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