Hello,
I'm working on a solar powered nixie watch (similar to the Kopriso Nixie
watch).
It's crucial that I dramatically reduce stand-by power as much as possible
and within 2.5uA, which is where the solar panels will balance off the
stand-by current.
Regardless of which power supply I use,
I used the LT3561 to provide the 3.3V logic supply from the battery (3.7 to
4.1V Li-ion), and it's standby leakage is practically zero. All I know is
the leakage current of this regulator, plus the operating current of the
DS3232 RTC and leakage of the HV driver, makes a very slight movement of
Thanks for your reply. That's impressive.
As a 3.3V regulator I'm using a simple MCP1700, but that takes about 6.5uA,
that's "too much" vs 1.6uA declared in a the datasheet, I tried a few
parts, maybe not a genuine batch...
Then 2.4uA is taken by the power supply DC/DC converter. This can be
Max,
The LT1308B has a .01 uA typical, 1 uA maximum standby current when
shut down, according to the data sheet, shown on page 2 as Iq (the
third line with Vshdn = 0V).
I don't think you have a problem here.
On 6/6/21, Max DN wrote:
> Hello,
>
> I'm working on a solar powered nixie watch
That's great to hear as a confirmation. As soon as I get a chance to spend
some time on the bench, I'll give it a try. It should be quick enough. I'm
going to use a standard MMBTA42, please let me know what you have used, if
you can share that piece of information.
Thanks Christian.
Il giorno
I've successfully used a P-channel MOSFET as a high side load switch for a
LM3478 based tapped inductor booster. IIRC the off current was
immeasurable, so sub 100nA.
søndag den 6. juni 2021 kl. 19.33.50 UTC+2 skrev flata...@gmail.com:
> Thanks David, indeed you are absolutely right. The power
The MMBTA42 is a bipolar transistor and not a FET. Secondly it's NPN,
making it unsuitable as a high side switch, because the base needs to be at
least at 0.7V higher than the voltage at the emitter for the transistor to
turn on. I used a Winsok WST2339 because that was the lowest Rds(on)
Sorry, it's early morning here and I'm apparently not fully awakened yet.
Meant to say that it was the lowest Rds(on) P-channel FET I could find in a
SOT-23 package from LCSC, which is where I shop most of my components.
You'd be able to get away with a slightly higher Rds(on) FET. If it's too
