[WIP] 22mm DD+single-7135 driver / single sided / Dual-PWM / Zener

Those extra pads are the kitchen sink spoken of earlier. For thermal and such. I donā€™t really understand that aspect of it, but as a normal driver it works just fine. Maybe Iā€™ll figure out just what the kitchen sink has to do with lighting and implement some good ā€œcleanā€ fun. :stuck_out_tongue:

Has anyone used the pulldown resistor for the OTC? What resistor-value range are we talking about? My cap is taking too long to drain.

I remember seeing a discussion about it somewhere, but now I canā€™t find it.

Does this look right? I canā€™t get it to work properly, no matter what firmware I use it gets stuck on turbo. Iā€™ve used a zener and replaced the diode with a 200ohm resistor.
Iā€™m using it for a MT-G2 build.

Stuck on turbo? as if it is going DD and bypassing the driver?

As in, I can cycle through modes but when I get into turbo I canā€™t get out

wow. Thatā€™s very strange. My gut tells me it has to be something with the firmware, but youā€™ve already tried different ones so Iā€™m stumped. Hopefully somebody else can chime in.

Think Iā€™ll try another firmware tonight. Does C1 need to move?

Managed to get this working in a Nitecore MT40 :slight_smile:
Still not 100% happy with the firmware but Iā€™m always adjusting the modes anyway.

Any trick to get it working? Did you move the C1 cap? I'm about to convert one to a zener.

I'm surprised there hasn't been more posts on this driver - seems awesome. I'm gonna try a zener mod version to go in a Roche LS01 w/XHP-70.

Nope just left the board with the same layout as above the trick seems to be getting the firmware right.

Without the zener (went into a SupFire F3-L2 with BLF-A6 firmware):

Why are you using a 47k resistor for R1?

Will the NXP PSMN3R0-30YLDX N-Channel MOSFET - LFPAK56 work on this driver? I do not have the FET in the photo aboveā€¦

matt

Yes - think that was the original one on the parts list? Anyway it would work fine, accept not the best for high amps with triple LED's in parallel for example. I use the SIR800DP pretty much all the time now though. Probably no noticeable difference for single LED applications.

Is there really a noticeable difference for any set up? Or is it just a measurable difference?

I would therefore assume any of the drivers in this series use the same parts + the 7135?

Thanks Matt

Yes. There are a bunch if extra pads on this one but you can just leave them empty, they arenā€™t necessary for normal function

I think noticeable based on Tom E and RMMā€™s comments in the A17DD-L thread. See RMMā€™s post #270 there where he gives a quick impactful example. I think that Iā€™ve also seen another post saying that a triple XP-L does benefit from the SiR800DP.

I remember reading that our usual FETs donā€™t like the multiple XHPā€™s much so Iā€™ve actually used two in parallel before. I hadnā€™t heard it made a difference in a 3v triple though. Iā€™d love to know how much of a difference it makes. If it gains me 50 extra lumens at max then to me it isnā€™t worth the cost. If itā€™s more like 200 lumens, then maybe Iā€™ll change my usual PO.

Itā€™s not really the XHPā€™s voltage which creates the issue (typically higher volt setups will actually be easier on the FET because the higher gate voltage opens the FET more fully). Typically the issue should be the current. So multiple-anything should produce the same issue: high currents.

As mentioned in the other thread, SiR800DP has itā€™s quirk(s) which must be dealt with. Tom E added a gate pulldown resistor which seems to take care of things nicely.