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Old 16th March 2012, 10:57 AM   #1
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Default 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???
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Old 16th March 2012, 12:06 PM   #2
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Quote:
Originally Posted by avi198617 View Post
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
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Old 16th March 2012, 12:13 PM   #3
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Sorry , it was a mistake. It is AC
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Old 16th March 2012, 12:32 PM   #4
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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.
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Old 16th March 2012, 02:09 PM   #5
Doz is offline Doz  United Kingdom
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Whoa, IIRC, the filament on VFD's is normally 3 volts, and -30 applied to the cathode to illuminate the segment.
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Old 16th March 2012, 02:25 PM   #6
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Quote:
Originally Posted by Doz View Post
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
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Old 16th March 2012, 02:43 PM   #7
alexcp is offline alexcp  United States
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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.
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Old 17th March 2012, 04:36 AM   #8
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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.
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File Type: jpg vfd.JPG (145.4 KB, 146 views)
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Old 17th March 2012, 04:41 AM   #9
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Here's a link with some general info on driving VFD's.
Vacuum Fluorescent Display (VFD)
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Old 17th March 2012, 05:14 AM   #10
avp1 is offline avp1  United States
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You need a specialized chip. Something like these: Holtek Semiconductor - VFD Controller & Driver Series
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