PTN04050CAD Fixed resistor questions

[memnoch]

So I've gone over the chart within the Ever Cool Variable Voltage mod using the 4050, went over the chart listed in the .44mm mod as well and was wondering if anyone w/ some experience futzing with the resistors could offer me some assistance.

I'd really like to get the widest voltage range possible, ideally if I had to pick, 3.5-3.7-ish being around the lowest, 7-ish being the desired upper end. I like the idea of the diode in place, though, it would seem from what people say, it isn't really required? No irregular voltage drop off without it?

So basically, does anyone know what resistor(s) should be used to accomplish this? Or should I go ahead and stick a rheostat in it's place and have 2 adjustments to make? This clearly isn't the most ideal setup. What are the range values if you simply bridge it with wire instead?

Any information would be appreciated, thanks everyone!

 

[breaktru]

If you use the 10k fixed resistor in series with the 100k pot as shown in my schematic between Pin 3 and ground (neg)
and you put a 10k fixed resistor in series with a slide On/Off switch between Pin 3 and 4 you should get these APPROXIMATE results of 3.7v to 7.1v:

With the pot zeroed and the slide switch OFF you SHOULD get around a little over 7 volts for the High end.
With the pot at max and the slide ON you SHOULD get somewhere around 3.7 volts

Warning do not short / put a switch alone between Pin 3 and Pin 4.

These figures are guess-timates and not an exact calculation.
I used the tests I've done on my .44 mini booster plus the datasheet table values.
Resistor/Voltage Table

Edit:
NO DIODE WAS CONSIDERED ABOVE

 

[mrengles]

Hey guys/gals just want to follow this thread....

 

[breaktru]

Hey Mem, how did you make out with your build?

 

[executivul]

But beware, the lower you go, the more you pull the booster out of specs, the lower it's efficiency is.


Sent from my iPad using Tapatalk.

 

[breaktru]

But beware, the lower you go, the more you pull the booster out of specs, the lower it's efficiency is.


Sent from my iPad using Tapatalk.

Thanks exec, yes you are absolutely correct and I know this very well having read the datasheet many times, but............
I think out of spec and 7 hours vape time w/ a single 14500, 900mah is acceptable (to me anyway) even if it's efficiency % is lower than specified.
I've used the boost mod for several months with no degradation to performance or circuit / battery health.

 

[boomer2506]

Breaktru watch out for the mod cops!!!

 

[executivul]

@breaktru: I'm building a simple efficiency meter right now
A MSP430 with two INA210 to measure the input output currents and voltages, compute input and output power and display the efficiency. Using that with my electronic load to test different dc-dc converters. As soon as I have it, I'll test the 4050c out of specs to see how bad things really are.


Sent from my iPad using Tapatalk.

 

[breaktru]

Can't wait to see the results exec

 

[breaktru]

@breaktru: I'm building a simple efficiency meter right now
A MSP430 with two INA210 to measure the input output currents and voltages, compute input and output power and display the efficiency. Using that with my electronic load to test different dc-dc converters. As soon as I have it, I'll test the 4050c out of specs to see how bad things really are.


Sent from my iPad using Tapatalk.

@executivul how did you make out with your efficiency tests?