[WIP][mostly retired] 17mm DD+7135 -- linear regulated driver w/ FET turbo

Flashlight Modding and DIY Parts
101

Sorry no progress made.
I had an issue with the code not changing modes anymore so I just used a nanjg with a Fet for turbo wired on top in my Y3…
I would like to use this in my courui, especially because I aim for led destroying currents |(
So I will have a look into it soon.

The use of this driver lies in hardcore driven lights, if you pulse 10A with 10% duty cycle to get a 1A mode efficiency is really worth talking about…another benefit is the zero PWM in the constant modes.

102
  • I am inclined agree with ToyKeeper. This driver doesn’t appear to do much which I see a need for. The hardware is complete and functions. As I commented earlier in the thread, I designed the driver after forgetting that the “Reset” pin was very tricky for end users to make use of. [Read the thread if you don’t know what I’m talking about here.]
  • As Werner points out, a driver with several linear-regulated levels plus wild FET levels makes sense to tame a hotrod light. The thing is that these hotrod lights don’t need 17mm drivers. We can build much larger and complex drivers for these lights, we aren’t even limited to 8-pin MCUs in those designs.
  • I’ll take a look at doing another version of this thing in a few minutes.
  • Rather than indexing a bunch of 7135’s I think using an op-amp in the way that led4power has on the LD-1 is probably the way to go. It requires quite a few additional components but frees up a lot of MCU pins.
103

I put the A17HYBRID-S driver, with one 7135 chip, in the Eagle Eye A6 light. With an XP-L and wire bypassed phosphor bronze springs I’m getting less than a lumen in low, 1587 now in Turbo at 6.89A.

“These hot rod lights don’t need 17mm drivers” ? HuH? I almost exclusively use 17mm drivers. If it’s bigger than that I piggyback a 17 in. And of course, the X6 and A6 ARE 17mm drivers.

104

Eh, that’s a fair point DBCstm. Feel free to strike that from your reading of my post. I should have said that lights like the D01 do not need 17mm drivers. I was referring to big hotrod lights like that one (which Werner mentioned). For those lights there’s no reason to stick with 17mm and all of the difficult routing & component limits that imposes. If a person wanted to index 20 or 30x 7135 chips in binary groups using a shift register they’d have space to do that in a Courui D01 - this just isn’t true in 17mm-driver-having lights.

The bottom line remains the same. I’ve pushed the limits of what it’s possible for me to route in 17mm and what it’s possible to hang off of an 8pin MCU. I don’t see a lot left to mine out of this concept. Realistically the final release of this driver should probably be something like:

  • FET+1+5
  • FET & +1 are on PWM
  • +5 are on a single on/off output and may be populated as desired.

While that isn’t as heavily addressable as what I’d originally planned for this driver it’s not too bad.

A little earlier today I took a look at combining what’s on this driver with the FET+1 driver DBCstm mentioned. Not going to happen. Both of these drivers are shoehorned into 17mm and there simply is not room to do it properly. I could make it function, but things would suffer and it would not be worthwhile.

105

I thought this was the FET +1 chip. Sorry!

Carry on…

106

Wight :) Couldn't this be accomplished with a daughter board like the LD series drivers?