Programming instructions

DIAC
 National Instruments Corporation 3-15 Multisim Component Reference Guide
3.9.1 DC Model
The diac is switched on and the resistance, R
s,
is set low if, in either the positive or negative
direction
.
V
d
≥ V
s
The diac is switched off (current-blocking mode) and R
s
is set high if, in either direction:
Id < Ih
where:
V
d
= voltage across the diac, in volts
I
d
= current through the diac, in amperes
R
s
= blocking resistance
I
rev
= = peak off-state reverse current
Other symbols used in these equations are defined in “Diac Parameters and Defaults”.
3.9.2 Time-Domain and AC Small-Signal Models
Each of the Shockley diodes is simulated with the mixed electrical/behavioral model
described in the DC model above.
V
I
s
rev
ComponentRef.book Page 15 Thursday, December 7, 2006 10:12 AM