Need for AN809 , AN811 and IR2159?

[ABSF]

Instead of using AC, would it be easier to use a 5VDC or 12VDC rail from a cheap PC power supply, to run a series of LEDs? What do you guys think?

For experiments, it would be OK to used PC PSU. Now we can buy 1W LED which is very bright and it needs only 3 to 3.6V with a current of 330mA. There are switching PSU designed for these LEDs operating at 240V ac. There are also 3W and 7W versions by connecting 3 and 7 of them in series.

These LEDs are real energy savers and my friend installed a few of them (12V DC version) in his plantation atap house run by solar cells and a car battery. That would last him a long time.

Allen

[waddah]

Brother, what is AN809 and other code? You are looking for IC or document?

Digitally Addressable DALI Dimming Ballast. It's a tool used in dimming lighting systems , PIC16F628 together with IR2159 HVIC Ballast Controller..

Dimming flourescence lamps had always been a problem in electronics. Ordinary lighting system using filament light bulbs and LEDs can easily be dimmed using the PWM techniques. The article you mentioned was written in 2002 and the kits must be out of date and are no more available to the public unless you want to construct the circuit yourself. The 2 important chips L6561D by ST and IR21592 by IR are available from Farnell each costing RM 4.69 and 17.28 respextively. You can get the 16F628 from Cytron.

http://my.element14.com/jsp/search/brow ... allpartial

The problem in constructing the circuit is where to get the 3 inductors L1, L2 and L3. The 5V supply for the 16F628 was taken from the mains, rectified and just dropped by a resistor , stabilized with a capacitor and a zener.

If I were you I would take down a few faulty energy saving lamps and savage its parts or buy a few regular electronic ballast from supermarket (they are quite cheap 'bout RM 12.00 or lower each) and use whatever is useful to construct the DALI circuit.

Allen

Thank you Allen; You've enlightened me somehow. Anyway, regardless to the shortcomings of the system, it still attracts the user because of its concept to control (ON/OFF or dimming) electrical appliances (individually or in groups) digitally by their addresses. http://www.dali-ag.org/ .
If you do have or able to get up to date approaches and share them, I'll be very thankful. I'll drop in sometimes for getting help from around here.