It is important to note that there is large voltage drop across the tube. The potential difference between the cathode and ground is typically close to 100 volts less than the anode voltage. Meaning that for a typical tube, at 180 volts at the anode, the voltage between the active cathode(s) and ground would typically be around 80. These devices are overkill as far as voltage goes but again, they replace so many components it's almost a no brainer. Unless of course you want the aesthetic of 60 transistors on your board.
On Wed, Apr 15, 2020 at 10:10 AM Kevin A. <[email protected]> wrote: > I've been using a few of the microchip high voltage serial to parallel > converters in a number of projects. They are great and reduce component > count significantly. > Here are some of the major differences with the devices I've used for > nixie applications. > > All the following are 32 bit (controlling 32 individual high voltage open > drains): > > - HV5522: > 220 volt rating > 12 volt logic level - has been run at 5 and 8 volts VDD, YMMV > Shifting direction - clockwise viewed from top of package > Available packages - PQFP-44, PLCC-44 > Power dissipation: 1.2 watts for both package types > Minimum ground current: 1.5 amps (duty cycle is limited by power > dissipation) > > - HV5530: > 300 volt rating > 12 volt logic level - has been run at 5 and 8 volts VDD, YMMV > Shifting direction - clockwise viewed from top of package > Available packages - PQFP-44, PLCC-44 > Power dissipation: 1.2 watts for both package types > Minimum ground current: 1.5 amps > > - HV5523: > 220 volt rating > 5 volt logic level > Shifting direction - clockwise viewed from top of package > Available packages - QFN-44 > Power dissipation: 3.4 watts > Minimum ground current: 1.5 amps > > - HV5622: > Identical specs to HV5522 - shifts in opposite direction - > counterclockwise from top of package > > - HV5630: > Identical specs to HV5530 - shifts in opposite direction - > counterclockwise from top of package > > - HV5623: > Identical specs to HV5523 - shifts in opposite direction - > counterclockwise from top of package > > On Wed, Apr 15, 2020, 9:42 AM Richard Scales <[email protected]> > wrote: > >> There seem to be so many nearly identical products from Microchip. I have >> been experimenting the HV5622 which has 32 outputs,etc.etc.etc - it is >> also available in SMD format if desired. >> Yes, it needs (likes) 12V levels though on the bench right now I have one >> clocking away being driven entirely by a WeMos at 3V3 levels - totally out >> of spec I know. I plan to be shifting levels to 12V using 2N7000's for the >> 'real' thing - but they have not turned up yet! >> >> It might help you to know (you may already know) that Microchip offer a >> 'samples' service so you could get some for 'evaluation' purposes. >> >> Richard >> >> >> On Wednesday, 15 April 2020 14:28:39 UTC+1, joenixie wrote: >>> >>> Hi John, >>> >>> Ayeeeee..... I was looking the 8 channel push pull brother of this and >>> it was 5 volt logic, sigh... I thought it was tooo easy, but maybe it won't >>> be so bad, i's just a few leads needing shifted. >>> >>> Thanks! >>> Joe >>> >>> On Wednesday, April 15, 2020 7:47:55 AM CDT 'John Rehwinkel' via >>> neonixie-l wrote: >>> > > I was digging around mouse for serial to parallel converters when I >>> ran across these Microchip drivers HV5630 @ >>> https://www.mouser.com/datasheet/2/268/20005855A-1512677.pdf. >>> > > >>> > > With two of these you could drive 6 digits without polling and have >>> 4 extra lines left over for ne-2 lamps. >>> > > >>> > > Are they as good as they look or am I missing something. They're >>> cheap too and easily had solderable. Seems too good to be true >>> > >>> > They take 12V logic levels, so would need a level shifter for use with >>> ordinary 5V or 3.3V logic. >>> > >>> > - John >>> > >>> > >>> >>> >>> -- >> 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/c97968d4-9b96-4f02-a5ef-682f34182705%40googlegroups.com >> <https://groups.google.com/d/msgid/neonixie-l/c97968d4-9b96-4f02-a5ef-682f34182705%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- 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/CALcVLK%2B870EGpzdPZBHXxcOTvLtkm%3D04PhZm_vQ%2BgqD4qNLEig%40mail.gmail.com.
