@ptr727 My design above did work. And it was 2 channel. But it did flicker a little. I'm going to try a digital potentiometer.
Posts made by mriksman
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RE: Question: FL5150 LED Dimmer - replace a analog potentiometer with a digital oneposted in Hardware
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RE: Question: FL5150 LED Dimmer - replace a analog potentiometer with a digital oneposted in Hardware
The important thing to remember when making more than 1 channel - you cannot tie those GNDs together; they are NOT 0V and are NOT equal to each other. Call one GND_A and one GND_B. Or Bob and Greg. Each FL5150 must be separate. Which then means your microcontroller needs to be totally isolated. Which is where a digital potentiometer becomes very handy.
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RE: Question: FL5150 LED Dimmer - replace a analog potentiometer with a digital oneposted in Hardware
If anyone else ends up here like I did.
To drive the DIM Control pin without pulling from Vdd, try this.
This will keep the micro isolated. This assumes that you use a dual optoisolator, and that the CTR is the same. To ensure they ARE equally matched, you can buy the more expensive IL300 or LOC110 - built especially for this purpose.
Also do note: if you are going to make a DUAL dimmer, then do NOT connect the 'GND' between dimmer A and dimmer B. They must be separate.