TLC59711 to drive RGB strips with common GND and pulsed +5V lines?
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- PinballShoppe
- Posts: 2
- Joined: Sat Jan 28, 2023 8:08 pm
TLC59711 to drive RGB strips with common GND and pulsed +5V lines?
I'm trying to repair some old DMX lighting panels that use analogue RGB strips which require a common GND and three lines of pulsed +5V. This is effectively the reverse of normal dimmed RGB LED strips that use a common + voltage and then pulse the GND to dim each channel. Would it be possible to use the TLC59711 board to do this? I suspect not, but the board is so small and cost effective that I'd love to use it - it would save me untold hours of soldering breadboards with transistors & resistors.
- adafruit_support_bill
- Posts: 88086
- Joined: Sat Feb 07, 2009 10:11 am
Re: TLC59711 to drive RGB strips with common GND and pulsed +5V lines?
Max output per channel is 60mA. Not enough to drive a strip of any significant length.
- PinballShoppe
- Posts: 2
- Joined: Sat Jan 28, 2023 8:08 pm
Re: TLC59711 to drive RGB strips with common GND and pulsed +5V lines?
Good point. These are short strips however - 8 LEDs of each colour in each strip (24 LEDs per strip), and four strips per lighting panel.
- adafruit_support_bill
- Posts: 88086
- Joined: Sat Feb 07, 2009 10:11 am
Re: TLC59711 to drive RGB strips with common GND and pulsed +5V lines?
A typical small LED needs about 15-20mA for maximum brightness. With 8 in parallel and 60mA max, each one would be seeing about 7.5mA. That would be enough to light them up. Just not quite to the max.
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