S2006FS221V Teccor Electronics, Inc., S2006FS221V Datasheet - Page 140

• Manufacturer Part Number: S2006FS221V
• Description: Thyristor Product Catalog
• Manufacturer: Teccor Electronics, Inc.

AN1003
Figure AN1003.23
With a zero crossing state detected, software can be written to
turn on the triac by going from tri-state to a logic high on the gate
and be synchronized with the AC phase cycles (Quadrants I
and IV). Using pull-down switches connected to the microcontol-
ler inputs, the user can signal the software to adjust the duty
cycle of the triac.
For higher amperage loads, a small 0.8 A, TO-92 triac (operating
in Quadrants I and IV) can be used to drive a 25 A alternistor
triac (operating in Quadrants I and III) as shown in the heater
control illustration in Figure AN1003.24.
For a complete listing of the software used to control this circuit,
see the Microchip application note PICREF-4. This application
note can be downloaded from Microchip's Web site at
www.microchip.com.
http://www.teccor.com
[phone]
Microcontroller Light Dimmer Control
AC
(Return)
White
120 V ac
(High)
Remote
Switch
Connector
3
1
2
JP1
Bright
Dim
150 W
Lamp
RV
Varistor
R
20 M
1
3
R
47
1
S
S
2
1
+5 V
R
1 M
2
0.1 µF
C
V
GP
GP
GP
3
DD
5
4
3
12C508
R
470
R
470
U1
4
5
V
GP
GP
GP
AN1003 - 8
SS
0
2
1
D
1N4001
1
D
1N4001
1
R
470
6
D
1N5231
3
Q
L4008L5
1
C
220 µF
1
V
DD
©2002 Teccor Electronics
Thyristor Product Catalog
0.01 µF
C
2
Application Notes