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 my 50uA meter. The RTC adjustment every 100 seconds pegs the meter.
The only MOSFET I have is for the HV inverter (DMN6040SVT) , and it's leakage is rated at 100nA. The standby current of my nixie watch board is so low that the battery lasted *6 years* on a single charge. I should also mention this battery was used in my cellphone for several years, so it's capacity is significantly less than the original 1100ma-hr. This board is in my garage, and every so often I would push the display button to energize the display. Alas, I finally had to charge it last month because it could no longer light all digits. On Sunday, June 6, 2021 at 2:41:25 AM UTC-7 [email protected] wrote: > 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, even using the shutdown pin, the > power supply still takes 2.5uA. This is perfectly in line with the > electrical specifications of the datasheets. > > So, my question is, can I 'brute force' a shutdown, effectively removing > the power from the VIN pin via a PNP high speed mosfet such as MMBTA42 or > it will introduce too much of a delay in starting the power supply? > > I'm going to try it on the fly but if anyone has any suggestions on how to > bring to 0 or to 0.01uA the stand-by current that would be great. > > As an example, I'm using the LT1308B DC/DC converter as on page 17 of the > datasheet > https://www.analog.com/media/en/technical-documentation/data-sheets/1308abfb.pdf > > Any suggestions will be much appreciated. > > Thank you, > Max > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/821a3e9a-cb32-4768-a0d8-4bb15c1dcc5an%40googlegroups.com.
