AC08FSM datasheet(140/223 Pages) TECCOR

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AN1003

Application Notes

http://www.teccor.com

AN1003 - 8

+1 972-580-7777

Thyristor Product Catalog

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.

120 V ac

(High)

(Return)

White

RV1

Varistor

0.1 µF

+5 V

1 M

1N4001

20 M

1N5231

220 µF

0.01 µF

VDD

GP5

GP4

GP3

VSS

GP0

GP1

GP2

470

L4008L5

470

Bright

Dim

VDD

150 W

Lamp

JP1

Remote

Switch

Connector

12C508

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