#avr Logs

May 25 2019

12:22 AM gsi__ is now known as gsi_
01:11 AM polprog: [06:55] rue_mohr: I wonder why the pushpull driver didn't work for you
01:12 AM polprog: mosfetrs with too big Rds(on) at 5V
01:12 AM polprog: mosfets*
01:13 AM polprog: we arent ignoring your advice, if not you id never be able to build the boost conv
01:45 AM rue_mohr: hmm
07:37 AM jancoow_ is now known as jancoow
12:53 PM day__ is now known as day
01:04 PM day: polprog: did you progress on the filament driving?
01:59 PM day__ is now known as day
02:01 PM polprog: day: no, tomorrow morning im going to buy the right mosfets
02:01 PM polprog: right now were going out to test our floating robot
02:01 PM polprog: so far a mosfet driver board on a longish cat5 with a fan controlled by a button :D
02:59 PM rue_shop1: hey
02:59 PM rue_shop1: fighting to stay awake
02:59 PM rue_shop1: polprog, what mosfets were you using?
02:59 PM polprog: hey, youre finally awake
03:00 PM polprog: right now p55nf06
03:00 PM polprog: ive got a couple better selected, ill see what i can get tomorrow
03:00 PM polprog: beer time, ttyl
03:43 PM rue_shop1: 60A
03:44 PM rue_shop1: 60V
03:44 PM rue_shop1: 55A
03:44 PM rue_shop1: can never remember how those numbers go
03:44 PM rue_shop1: ok
03:45 PM rue_shop1: for the inverter?
03:45 PM rue_shop1: 55A fet should be fine
03:45 PM rue_shop1: your wattage is REALLY low
03:49 PM polprog: its not about the wattage
03:49 PM polprog: the wattage is low
03:50 PM polprog: its about the Rdson and the Vgs(th)
03:50 PM polprog: one or the other is too high
03:50 PM polprog: i bet the other one
03:50 PM polprog: I found 4 suitable replacements with way lower Vgs(th)
03:51 PM polprog: and i will experiment with them later tomorrow
03:52 PM polprog: STP* series
03:52 PM polprog: STP16NF06 or STP60NF06
03:53 PM polprog: or one like i took out of the power supply, STP3020L
03:53 PM polprog: that one rocks
03:57 PM polprog: remember 5V is pretty low in the non mcu world
03:57 PM polprog: :)
03:58 PM rue_shop1: this is for your flyback converter right?
04:01 PM polprog: there is no flyback
04:01 PM polprog: the converter is a boost converter
04:02 PM polprog: the mosfets are for an h-bridge driver for the filament
04:03 PM polprog: the boost converter is done, its on a PCB now, not changing it
04:03 PM polprog: im very happy with how it came out
04:40 PM rue_shop1: boost converters use flyback
04:41 PM rue_shop1: that fet couldn't do the filament drive?
11:26 PM day__ is now known as day