Driving 3 LEDs off a single AMC7135 type board

[Rufusbduck]

@Manual Man

Its alive once more…

An update is in order:

I have succeeded in driving 3 LEDS individually off one board. I removed all but one 7135 off the bottom of the board, soldered one more 7135 on to the top of the board and cut the negative traces so I have 3 pairs of 7135s. Each LED is soldered to an individual pair of 7135s so they each get 700mA and the modes are retained.

A big thank you to the guys on here who told me what to do and how to do it.

Unfortunately I had to de-solder everything and re-solder it to get it to fit into a p60 drop-in I had machined out for it, and in the process it no longer works. I may have to sacrifice a third 7135 board to get it to go again
I will stick up some pictures once I get it going again (but don’t hold your breath as I am quite bizzy at the mo). The circuit draws 4mA off a 18650 however nothing goes, so perhaps I have bumped into the same problem I did last time (PK pilot suggested the 7135s might be switched off or something). That or it is just bad soldering on my part

If you check it with a dmm you may find the Vdd control trace has been shorted to ground.

[Rufusbduck]

@NightCrawl

How many lines can one of these MCUs control individually? 3? 4?

Same as before. The mcu controls the individual 7135 chips. The outputs are split and regrouped as needed with no effect on the mcu. Just the way slave boards work but on a single board.

[DrJones]

I think he referred to individually controlled lines with individual PWM levels - at least that’s what I answered to.

[NightCrawl]

Now that I read both of your answers, I'm not sure what I meant either. :D

I'll try: With cutting the traces, the AMC groups are controlled together but their output is split.

And DrJones said that its possible to drive 5 LEDs from one driver and each one can have a different output.

Did I get it right?

[Rufusbduck]

Maximum output per I/O pin on the Attiny is 40mA. Each 7135 uses ~ .2 mA to pass 350mA. 40/.2 = 200 chips or 25 x 8 chip 3A boards or 100 x 2 chip 700mA. I doubt this would work for real but wtf, why not. 1 master and 3-3 A slaves is common and that’s 4 lines controlling 32 chips from 1 mcu.

[benz]

Hi manual man if you get the chance, I would love to see the photos or even just a drawing of what you did to get this setup to work. I would love to do the same but couldn’t quite visualise what you actually did! (Im new to all this…!)