Oh nice, I've been using the same chip but I wanted to double check if there wasn't some other solution people were using.
I went with the SiSB46DN suggested by the datasheet and I've been fine with protection even for 3.3V with a lower voltage bound of 3V. I've also tested a circuit for 0.6-1.5V for filaments by powering the IC at a higher voltage but applying the lower V-filament to the transistor, and that also works. On Monday, 8 November 2021 at 01:29:04 UTC-5 newxito wrote: > This is the protection circuit I use, taken from the LTC4365 datasheet. I > used the formulas to calculate the resistors and the LTspice simulation > confirmed the values. The circuit works, kind of, shuts down under 4V and > over 6V. But when starting with 5V I only get around 4.2 output voltage, > that’s wrong. Probably some kind of oscillation… > I use the same circuit with other resistor values for 12V and it works > perfectly all the time. > > > ZY schrieb am Montag, 8. November 2021 um 01:59:34 UTC+1: > >> What is your method of input protection? >> >> On Sunday, 7 November 2021 at 17:14:52 UTC-5 newxito wrote: >> >>> Today I built the clock. There is an error on the board, the DataIn pin >>> of the LED array is connected to the wrong side of the level shifter, but >>> it seems to work fine with 3.3V. I also had problems with the input >>> protection (over, under and reverse voltage). I always used the circuit >>> with 12V but this boards uses 5V, probably the monitoring window is too >>> small. Anyway, removing some components and a big blob of solder, solved >>> the problem :-) >>> I fill fix the design errors on Rev2… time to start making the case… >>> >>> -- 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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/b36b7ec2-d257-473d-8d80-2fce724f4769n%40googlegroups.com.
