Q2004D31V
| Model | Q2004D31V |
| Description | Thyristor Product Catalog |
| PDF file | Total 224 pages (File size: 3M) |
| Chip Manufacturer | TECCOR |
AN1003
Application Notes
120 V ac
(High)
R
1
47
C
3
0.1 µF
D
1
1N4001
V
DD
RV
1
Varistor
AC
(Return)
White
150 W
Lamp
+5 V
R
2
1M
D
1
1N4001
D
3
1N5231
C
1
220 µF
C
2
0.01 µF
U1
V
DD
V
SS
GP
0
GP
1
GP
2
12C508
R
6
470
Q
1
L4008L5
R
3
20 M
GP
5
GP
4
GP
3
Remote
Switch
Connector
JP1
3
2
1
Bright
S
2
Dim
S
1
R
4
470
R
5
470
Figure AN1003.23
Microcontroller Light Dimmer Control
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
+1 972-580-7777
AN1003 - 8
©2002 Teccor Electronics
Thyristor Product Catalog
