| Stefan Kanev 01/13/10 01:25 Read: 165 times Silistra Bulgaria |
#172412 - probably Responding to: Alan Dorman's previous message |
If triac's A1 pin is connected to VCC pin of microcontroller You can turn-on triac with sinking to VSS . In idle state microcontroller output must be in high state. Very important is load type - on incandescent lamp short gate pulse is enough on any phase angle , on saving lamp - things are different.
There are application notes from Microchip, Texas (and Silabs or Cygnal, cant remember) - they are discussing dimmer circuit to be mounted instead wall switch. In this case problem is powering of microcontroller circuit - micro must be in really low power mode. If You have independent supply - then 892051 will be ok. |
| Topic | Author | Date |
| driving a triac with a ATMEL MCU | Alan Dorman | 01/12/10 23:58 |
| pull-up or other chip? | Per Westermark | 01/13/10 00:14 |
| probably | Stefan KAnev | 01/13/10 01:25 |
| five volts controlling a hundred | Alan Dorman | 01/13/10 04:32 |
| so i answered | Stefan KAnev | 01/13/10 04:52 |
| Throwing out the baby? | Andy Neil | 01/13/10 01:36 |
| previous | Alan Dorman | 01/13/10 04:22 |
| they need freelancers? | Stefan KAnev | 01/13/10 04:28 |
| I see | Andy Neil | 01/13/10 05:21 |
| Yep | Alan Dorman | 01/13/10 11:31 |
| don't forget about "triac drivers" | Richard Erlacher | 01/13/10 08:09 |
| my prefered way | Alan Dorman | 01/13/10 11:37 |
| Do always use a buffer! | Kai Klaas | 01/13/10 08:54 |
| there is an old Philips appnote which ... | Erik Malund | 01/13/10 09:12 |
| incredible | Stefan KAnev | 01/13/10 09:46 |
Thanks! | Alan Dorman | 01/13/10 11:43 |