Author Topic: Recommendation for a 4-channel PWM LED Driver  (Read 1236 times)

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Offline optoisolatedTopic starter

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Recommendation for a 4-channel PWM LED Driver
« on: September 03, 2018, 04:31:15 am »
Hi All,
I'm looking for part suggestions for a 4-channel PWM I2C part for driving indicator LEDs. I'm currently considering thse PCA9685 and while within budget, it seems excessive to use a chip capable of driving 16 channels, when I only really need 4. Open to any suggestions and/or feedback. Using the PWM for dynamic brightness control of the indicator LEDs so that it doesn't blind people at 3am and for general adjust-ability. Using standard 5MM Red, Yellow, Green, Blue LEDs.

Goal with part choice is to reduce BOM if possible.

Cheers.
 

Online mikeselectricstuff

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Re: Recommendation for a 4-channel PWM LED Driver
« Reply #1 on: September 03, 2018, 12:47:36 pm »
If you only want global control, (vs per-led), then it's usually pretty trivial to do in software
 
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Offline optoisolatedTopic starter

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Re: Recommendation for a 4-channel PWM LED Driver
« Reply #2 on: October 01, 2018, 12:55:35 pm »
If I trim the brightness in my design so they are visually equal with some resistors and then use the CPU to adjust the brightness with PWM as you suggest, that soiunds like it will work.. Will muck around with it this week and see if it will work as I expect it to.. Cheers :)
 


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