Need VFD display filament driver

avi198617 · 16th March 2012, 10:57 AM

Hi ,
I have an VFD display of following type and as controller I have some samples of PT6311. I wanted to use them with MSP430 MCU of TI.

MSP430 is operating at 3.3V. I need arround -30V AC to drive this VFD's filament.
Can anyone help me on this???

Rundmaus · 16th March 2012, 12:06 PM

Quote:

Originally Posted by avi198617

Hi ,
I have an VFD display of following type and as controller I have some samples of PT6311. I wanted to use them with MSP430 MCU of TI.

MSP430 is operating at 3.3V. I need arround -30V AC to drive this VFD's filament.
Can anyone help me on this???

What exactly is -30V AC? Either it has a polarity, or it is AC...

Rundmaus

avi198617 · 16th March 2012, 12:13 PM

Sorry , it was a mistake

. It is AC

Rundmaus · 12:35 PM

Hm,

space for a small 2x15V AC transformer? How much current is needed?

Rundmaus

Doz · 16th March 2012, 02:09 PM

Whoa, IIRC, the filament on VFD's is normally 3 volts, and -30 applied to the cathode to illuminate the segment.

Rundmaus · 16th March 2012, 02:25 PM

Quote:

Originally Posted by Doz

Whoa, IIRC, the filament on VFD's is normally 3 volts, and -30 applied to the cathode to illuminate the segment.

Hey there,

for VFD as well as for other tubes, the (electron emitting) filament *is* the cathode.

But you are partly right, one has to distinguish between the voltage/current to heat the filament (probably a few volts) and the 'anode voltage' between the filament and the rest of the display - this will probably be the 30V mentioned.

A datasheet for the VFD would help!

Greetings,
Rundmaus

alexcp · 16th March 2012, 02:43 PM

avi198617, you can use an inverting switching regulator like MC33063A. The datasheet, under "application information", has all the formulae for selecting the few external components.

avi198617 · 17th March 2012, 04:36 AM

Hellow to all,
The unit I am building is getting its supply from DC wall adapter & it is better if I avoid usage of transformer.

I had came across some Chinese amplifier where I found this VFD & its driver IC.
There they had used two additional winding of 3V/0.3A,28V/0.2A. For my case,
I need some converter chip to generate those from 3.3V.

I had attached VFD datasheet on previous my post

..but it was bigger then the size mentioned. Anyways attaching only the relevant pages in JPEG form.

DigitalJunkie · 17th March 2012, 04:41 AM

Here's a link with some general info on driving VFD's.
Vacuum Fluorescent Display (VFD)

avp1 · 17th March 2012, 05:14 AM

You need a specialized chip. Something like these: Holtek Semiconductor - VFD Controller & Driver Series

16th March 2012, 10:57 AM	#1
avi198617 diyAudio Member Join Date: Oct 2010 Location: Kolkata	Need VFD display filament driver Hi , I have an VFD display of following type and as controller I have some samples of PT6311. I wanted to use them with MSP430 MCU of TI. MSP430 is operating at 3.3V. I need arround -30V AC to drive this VFD's filament. Can anyone help me on this???

16th March 2012, 12:13 PM	#3
avi198617 diyAudio Member Join Date: Oct 2010 Location: Kolkata	Sorry , it was a mistake. It is AC

16th March 2012, 12:32 PM	#4
Rundmaus diyAudio Member Join Date: Aug 2005	Hm, space for a small 2x15V AC transformer? How much current is needed? Rundmaus Last edited by Rundmaus; 16th March 2012 at 12:35 PM.

16th March 2012, 02:09 PM	#5
Doz diyAudio Member Join Date: Jul 2010 Location: Sat Down	Whoa, IIRC, the filament on VFD's is normally 3 volts, and -30 applied to the cathode to illuminate the segment. __________________ "To err is human.. to make a real balls-up requires a computer"

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16th March 2012, 02:43 PM	#7
alexcp diyAudio Member Join Date: Jun 2009 Location: Florida Blog Entries: 35	avi198617, you can use an inverting switching regulator like MC33063A. The datasheet, under "application information", has all the formulae for selecting the few external components.

17th March 2012, 04:41 AM	#9
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Here's a link with some general info on driving VFD's. Vacuum Fluorescent Display (VFD)

17th March 2012, 05:14 AM	#10
avp1 diyAudio Member Join Date: Oct 2010 Location: Central NJ	You need a specialized chip. Something like these: Holtek Semiconductor - VFD Controller & Driver Series

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