Hi all,
well, I will check the drivers with a small tube (like IN-17, or IN-16)
and then I will also try to drive larger ones (ZM1040), since that is
really of interest I guess. (But I know the HV9708 has to work with
ZM1040 because Dieter uses that chip in his clocks with ZM1040 tubes)
But I have to admit, I never really thought about these drivers so much.
I always figured they were open collector (or open drain which is
basically the same idea), so they were simple "switches" that enabled
current to flow from the +HV to GND. So these are "sink drivers" in this
terminology.
What is the main difference compared to source drivers? Can these
actually supply the HV? I.e. the sink drivers basically short the
circuit (build a connection) but the source drivers provide +HV on an
active pin? In this case, they should work as Nixie tube drivers, but
inverted, given the high voltage supplied on the driver's pin is higher
than the supply voltage minus ignition voltage of the Nixie tube.
Because if the pin was at GND potential, fine, the Nixie tube glows, and
if it is at HV (more than supply voltage minus ignition) the tube does
not ignite.
And what about these push/pull drivers? Looking at the block diagrams it
appears they are some sort of combination of these two. They can
actively sink but can also supply HV.
Did any of that make sense? ;-)
Best regards,
Jens
Am 22.02.2011 07:13, schrieb will:
Those PLCC to DIP adapters are pretty expensive!
Also, I think you are right, most of these chips were intended as
source drivers, but I imagine they will probably work for sinking at
the low currents we need.
I'll probably build a VFD clock with spare parts at some point here,
so having some of these supertex drivers around could be handy.
On Feb 21, 11:29 pm, Adam Jacobs<a...@jacobs.us> wrote:
The HV5522 is available in PLCC package, you can buy DIP sockets for PLCC.
I think that the HV518 is another source driver (designed for driving
VFD's). As I've mentioned before, I know nothing about these chips.. I'm
very excited to hear the results from all of this experimentation.
I'm actually most interested in the HV5182 as a VFD driver. My usual chip,
the MAX6921 is only available in PLCC& SOIC.. a DIP package would be much
appreciated. Also, Will, sparkfun makes some dandy SOIC& SSOP breakout
boards. Not the ideal solution, but it can keep you from needing to reject a
part based on package.
-Adam
On Mon, Feb 21, 2011 at 8:14 PM, will<ossumguyw...@gmail.com> wrote:
The 5522 only comes in SMD though. How about the HV518? I can't seem
to find that specification, and I ordered some. It's nice because it
comes in DIP and has 32 channels.
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