Never thought of three of these big FETs, in my eyes the advantages are not big enough…just to save some millivolts…
I ordered a 20mm PCB with space for tiny13A and some other neat things like space for a zenerdiode or the off time checking parts.
It features the nanjg layout so firmwares are compatible. No 7135 but space for some sot23 nfets or a TO220Fet( IRL3803). Along with two pads for an eswitch…
4 parallel sot23 FETs are good for 12A and have around 12mOhm so they work perfect in single cell lights, there are even better ones available but I am a budget guy…
The IRL3803 is a beast of transistor and would be suitable for everything we know…
Also we could use bigger resistors for voltage divider to reduce standby current for eswitch es.
There is no need to pay extra for a bigger board which costs 5 times more if you can just add a small PCB on top of the original driver.
I am not sure if the layout is correct because I tried some new things to test, they are already shipped but I guess I will get the the prototypes in a week or so.
45mm*45mm=3squareinch so oshpark would charge 15$ for a batch of three
20x20 cost only 3.1$ for a batch of three…
So basically parts for the whole 20mm board would be around the price the bare 45mm board costs…and the big board would only work in a single type of light because all the big lights are different…
Also you could not assemble a FET and just use the custom firmware with another driver like the 3T6 driver
I have a 17mm driver in mind like TiVo did with the zilog but just compatible with nanjg firmware. If the prototype works i will make one, hopefully I can learn something from the 20mm driver so that the new one even is better.