New Driver: PD68 "DoubleUp" - 26mm - Double FET - 4*7135

PD68 DoubleUp - 26mm - Double FET - 4x 7135

This is kind of a weird size since it’s for a specific light. I don’t know how useful it will be to other people, but I’ll share it anyways.

I worked hard to keep it symmetrical, so hopefully you can see that in the design.

  • 26mm
  • Fits Attiny13/25/45/85
  • 2x FETs to handle heat from multiple XHP’s in parallel
  • FETs are parallel, so can be used with 1 or both FETs populated
  • 4x 7135’s in parallel on second PWM circuit
  • Zener Ready
  • 10mm spring pad
  • 3.2mm LED+ passthrough (should easily accommodate 18awg wire)
  • 3.5mm LED- pad
  • 2mm edge keepout on top
  • Scrape-able pad for Pin3 (directly under its label)

It is of course untested until my order arrives

Rev1 (Current)

Reserved

Which light did you design it for?

SkyRay/Fandyfire G36

Sweet driver.

You should consider ditching the zener and using a LM2936 instead in a SOT223 package. Will regulate to a very nice 5 volts and have very, very low parasitic drain. Can handle up to 40 volts input. It has built in reverse polarity protection.

It needs a resistor in series with a capacitor going to ground on the output pin. Your board's existing cap should cover the need for an input cap.

I have these on the way. I would be happy to test such a board if you designed it.

http://www.aliexpress.com/item/20PCS-LM2936MP-5-0-LM2936MP-IC-REG-LDO-5V-50MA-SOT223-New-and-Original-ROHS/32378685779.html

Does it have an advantage in non-eswitch applications?

Frankly, I don’t know enough to start incorporating other components, I basically just physically rearrange existing circuits. If I can find a footprint, and you can show me how to connect it, I’d be happy to do the work in Eagle. Feel free to shoot me a PM with a simple diagram if you have one.

This sounds like a good driver for a J20 with XM-L2s.

The LM2936 does provided much more benefit to momentary switch lights. Of course, a momentary switch could be connected to the OTC pads on your board.

In a clickie light, it should have much less voltage drop out during operation. How much more voltage/current that would make available to the emitter, I don't know. The longer the light is on, the more important the loss would be. In a light that someone is trying to eliminate every little loss (e.g. resistance mods, etc), it will be considered a benefit.

The MCU would also get much more consistent voltage. I've been very impressed with how solid it's voltage output is.

I don't have Eagle on this computer. I'll PM you the info I have so far when I get on my other PC.

Thanks for the info. I’ll try to include that in future designs.

I’ll probably do a 20/22mm version of my 17mm driver next.