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T2117-3AS

Zero-voltage Switch with Adjustable Ramp

Atmel Corporation 

Triac Firing Current

(Pulse)

This depends on the triac requirement. It can be limited by the gate series resistance

which is calculated as follows:

RGmax

»

7----.--5-----V-----–-----V----G----m---a---x-

IGmax

–

36

W

IP

=

I--G----m----a--x-

T

´

tp

where:

VG

IGmax

Ip

tp

T

= Gate voltage

= Maximum gate current

= Average gate current

= Firing pulse width

= Mains period duration

Firing Pulse Width tp

This depends on the latching current of the triac and its load current. The firing pulse

width is determined by the zero-crossing detection which can be influenced by the syn-

chronous resistance, Rsync, (see Figure 6 on page 5).

tp

=

-2--

w

arc. sinèæI--L--P--´-----V--2---M--øö

where

IL

= Latching current of the triac

VM

= Mains supply, effective

P

= Load power

The total current consumption is influenced by the firing pulse width which can be calcu-

lated as follows:

Rsync

=

-V----M--------2-----s----i-n----èæ--w------´-----t-2---p---øö-----–----0---.--6-----V--- – 49 kW

3.5 ´ 10-5A

4 T2117

4768A–INDCO–11/03

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