AVS description

AN390

6/17

DocID3572 Rev 4

Where:

•

F is the AC line frequency

•

•

•

•

•

Table 1

gives the components value of the DC resistive and capacitive power supplies

whatever the AC line voltage value.

2.4

AVS block description

Figure 4

shows the block diagram of the AVS IC. Advantages of this AVS integrated circuit

are ease of circuit design, lower power dissipation, a smaller component count and

additional safety features.

Figure 4. AVS block diagram

Table 1. DC resistive and capacitor power supply components value

DC power

supply

R5

R6

C2

C3

Resistive

9.1 k

1 Watt

9.1 k

1 Watt

33 µF at 16 V 10%

Not applicable

Capacitive

100

2 Watt

Not applicable

33 µF at 16 V 10%

220 nF at 400V AC

X2

Supply

Peak

voltage

detector

Zero

voltage

crossing

detection

Oscillator

Reset

Parasitic

filter

MR Mains

mode

controller

Triggering

time

controller

1

4

8

2

7

5

6

3

VSS

VDD

VM

OSC/IN

OSC/OUT

VG

NC

MODE