Many thanks. Answers my doubts.
Would there be some driver to boost to 6V in the 7 Amp range? Preferred 22mm.
Yeah, and if he wants more power from it in an L6 he’ll have to go FET.
Yes, there are things I truly dislike on mobiles, but at times have no choice
I haven’t got much time nowadays. My latest project is sitting stagnant in the lathe. But I did get to mod something this week (if you can call this a mod…). I got a delivery of a uf2100 so I legoed it with the head from a wf-501a. I made one like this a few years back and sold it. I like the aesthetic so much I had to do another one.
Yup Kaidomain.
Convoy XHP35 driver with some modification, check this thread here : Convoy XHP35 Driver Analysis / Testing / Schematic
Changing R16 for 6V, R16= R17 x (Vout-Vfb)/Vfb with Vfb = 1V
So something like 220k or 240k.
And
R10 (Rsense) to 10m since Vsense is set at 74mV.
Or there is mine too, when I’ll be able to make some to sell, but it’s e-swtich only.
I did little test bench to see how changing current sense resistor affects in Convoy’s 6V 5A driver. I didn’t try to optimize the circuit, but it is same in both cases. First with stock driver and XHP70.2 M4 bin.
Then driver with 6,7mOhm current sense resistor (20mOhm and 10mOhm parallel. Otherwise the rig is the same.
So 18% increase in output.
@ Freeman – you’re heaven sent. I had totally forgotten about that XHP35 driver that you previously cited in one of my previous threads (Convoy boost driver problem).
A few resistor changes and I’d get the 7-7½ Amps in a 22mm package.
How do I earmark such reference posts? saved to ‘Drivers’ folder w/in Chrome. Committing to memory post titles falters.
I had read some on your endeavor with a 6 V Anduril boost. The ultra-low moonlight levels are not used for these types of lights. But I’m looking forward to the eventual production of some and I would have used a Sofirn C8 (‘x’) as host – if they would cater to such a request.
Yes, that one.
How weird, I changed the detection resistance to 0.05 Ohm (R010 + R010) and there was no difference. the resistors may not have made good contact.
You are above the driver’s current capability.
Maybe too much above specs of the components on the driver. Most likely not contact, because you should see some difference.
I don’t understand electronics
I will try R010 from stock + R020
As Freeman stated in post #10548, the converter is close to its limit. Haukkeli piggybacked a 20 mOhm but got 5.32 Amps. You will have to go the XHP35 modded driver (post #10555).
I get the pain of not having readily available parts that fit. It is part of the challenge.
i use simon’s 6v driver with sst70, i just need a little more current
Yes, that’s true. Most likely it’s possible to go little above the specs, but not that much.
With 10mOhm and 20mOhm piggyback and battery at ~4 volts it draw 8,9A from battery. So still within 10A switching limit. With lower voltages it might be a problem. 4V*8,9A=35,6W.
3,5V*X=35,6W —>
X=35,6W/3,5V —>
X=10,2A of current draw at 3,5V and that is about the boost converters maximum.
If anybody knows how it behaves after that, I’m happy to know.
Got a dud notification. I suppose someone deleted their post. It’s better to strikethrough as others may wish to follow the conversation. However, the Simple Post Editor has a bug in strikethrough shorthand as only valid within a single line, not an entire paragraph. A line break somehow confuses the mark-up. Never tried the Advanced Post Editor as too ‘fancy’ for my needs.
However, maybe the poster didn’t want to have his mistake be known – that’s fair. No big deal, just an annoyance.