Phase Control IC

premelec

premelec

Senior Member
Looks interesting - there are always alternatives :) I made an 8 channel 08M phase control dimmer using a TI 8 channel DAC into 2 LM324s driving opto isolators. The DAC was set by the PICAXE 08M and holds a DC output till changed by the 08M... a sawtooth ramp started at zero crossing is put into one op amp input [same for all 8 amps] and the other goes to the DAC output. It worked well... I used a similar setup to generate 8 current outputs to drive strings of LEDs - in that case the current feedback signal is fed into the op amps instead of the sawtooth waveform... [a MOSFET per channel holding the current...]
 
fernando_g

fernando_g

Senior Member
Siemens semiconductors...boy, that brings back old memories.

You could easily interface to a PICAXE by filtering a PWM output to generate the DC control voltage. But I see the control voltage range is greater than 5 volts, thus you'll also need an external opamp to amplify it.
 
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